[v5,2/3] ASoC: starfive: Add JH7110 TDM driver

Add tdm driver support for the StarFive JH7110 SoC.

Signed-off-by: Walker Chen <walker.chen@starfivetech.com>
---
 MAINTAINERS                     |   6 +
 sound/soc/Kconfig               |   1 +
 sound/soc/Makefile              |   1 +
 sound/soc/starfive/Kconfig      |  15 +
 sound/soc/starfive/Makefile     |   2 +
 sound/soc/starfive/jh7110_tdm.c | 679 ++++++++++++++++++++++++++++++++
 6 files changed, 704 insertions(+)
 create mode 100644 sound/soc/starfive/Kconfig
 create mode 100644 sound/soc/starfive/Makefile
 create mode 100644 sound/soc/starfive/jh7110_tdm.c

On 26.05.2023 17:54, Walker Chen wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Add tdm driver support for the StarFive JH7110 SoC.
> 
> Signed-off-by: Walker Chen <walker.chen@starfivetech.com>
> ---
>  MAINTAINERS                     |   6 +
>  sound/soc/Kconfig               |   1 +
>  sound/soc/Makefile              |   1 +
>  sound/soc/starfive/Kconfig      |  15 +
>  sound/soc/starfive/Makefile     |   2 +
>  sound/soc/starfive/jh7110_tdm.c | 679 ++++++++++++++++++++++++++++++++
>  6 files changed, 704 insertions(+)
>  create mode 100644 sound/soc/starfive/Kconfig
>  create mode 100644 sound/soc/starfive/Makefile
>  create mode 100644 sound/soc/starfive/jh7110_tdm.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2a0496448b7f..00478d07a9f4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -20132,6 +20132,12 @@ F:     Documentation/devicetree/bindings/power/starfive*
>  F:     drivers/soc/starfive/jh71xx_pmu.c
>  F:     include/dt-bindings/power/starfive,jh7110-pmu.h
> 
> +STARFIVE JH7110 TDM DRIVER
> +M:     Walker Chen <walker.chen@starfivetech.com>
> +S:     Maintained
> +F:     Documentation/devicetree/bindings/sound/starfive,jh7110-tdm.yaml
> +F:     sound/soc/starfive/jh7110_tdm.c
> +
>  STARFIVE SOC DRIVERS
>  M:     Conor Dooley <conor@kernel.org>
>  S:     Maintained
> diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
> index 848fbae26c3b..8d1d9401ecf2 100644
> --- a/sound/soc/Kconfig
> +++ b/sound/soc/Kconfig
> @@ -91,6 +91,7 @@ source "sound/soc/sh/Kconfig"
>  source "sound/soc/sof/Kconfig"
>  source "sound/soc/spear/Kconfig"
>  source "sound/soc/sprd/Kconfig"
> +source "sound/soc/starfive/Kconfig"
>  source "sound/soc/sti/Kconfig"
>  source "sound/soc/stm/Kconfig"
>  source "sound/soc/sunxi/Kconfig"
> diff --git a/sound/soc/Makefile b/sound/soc/Makefile
> index 507eaed1d6a1..65aeb4ef4068 100644
> --- a/sound/soc/Makefile
> +++ b/sound/soc/Makefile
> @@ -59,6 +59,7 @@ obj-$(CONFIG_SND_SOC) += sh/
>  obj-$(CONFIG_SND_SOC)  += sof/
>  obj-$(CONFIG_SND_SOC)  += spear/
>  obj-$(CONFIG_SND_SOC)  += sprd/
> +obj-$(CONFIG_SND_SOC)  += starfive/
>  obj-$(CONFIG_SND_SOC)  += sti/
>  obj-$(CONFIG_SND_SOC)  += stm/
>  obj-$(CONFIG_SND_SOC)  += sunxi/
> diff --git a/sound/soc/starfive/Kconfig b/sound/soc/starfive/Kconfig
> new file mode 100644
> index 000000000000..fafb681f8c0a
> --- /dev/null
> +++ b/sound/soc/starfive/Kconfig
> @@ -0,0 +1,15 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +config SND_SOC_STARFIVE
> +       tristate "Audio support for StarFive SoC"
> +       depends on COMPILE_TEST || ARCH_STARFIVE
> +       help
> +         Say Y or M if you want to add support for codecs attached to
> +         the Starfive SoCs' Audio interfaces. You will also need to
> +         select the audio interfaces to support below.
> +
> +config SND_SOC_JH7110_TDM
> +       tristate "JH7110 TDM device driver"
> +       depends on HAVE_CLK && SND_SOC_STARFIVE
> +       select SND_SOC_GENERIC_DMAENGINE_PCM
> +       help
> +         Say Y or M if you want to add support for StarFive TDM driver.
> diff --git a/sound/soc/starfive/Makefile b/sound/soc/starfive/Makefile
> new file mode 100644
> index 000000000000..f7d960211d72
> --- /dev/null
> +++ b/sound/soc/starfive/Makefile
> @@ -0,0 +1,2 @@
> +# StarFive Platform Support
> +obj-$(CONFIG_SND_SOC_JH7110_TDM) += jh7110_tdm.o
> diff --git a/sound/soc/starfive/jh7110_tdm.c b/sound/soc/starfive/jh7110_tdm.c
> new file mode 100644
> index 000000000000..973b910d2d3e
> --- /dev/null
> +++ b/sound/soc/starfive/jh7110_tdm.c
> @@ -0,0 +1,679 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * jh7110_tdm.c -- StarFive JH7110 TDM driver
> + *
> + * Copyright (C) 2023 StarFive Technology Co., Ltd.
> + *
> + * Author: Walker Chen <walker.chen@starfivetech.com>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/dmaengine.h>
> +#include <linux/module.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <linux/types.h>
> +#include <sound/dmaengine_pcm.h>
> +#include <sound/initval.h>
> +#include <sound/pcm.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +#include <sound/soc-dai.h>
> +
> +#define TDM_PCMGBCR                    0x00
> +       #define PCMGBCR_MASK            0x1e

This is not used.

> +       #define PCMGBCR_ENABLE          BIT(0)

Same

> +       #define PCMGBCR_TRITXEN         BIT(4)

This is not used

> +       #define CLKPOL_BIT              5
> +       #define TRITXEN_BIT             4
> +       #define ELM_BIT                 3
> +       #define SYNCM_BIT               2
> +       #define MS_BIT                  1

Instead of these *_BIT defines as plain numbers you can defined them using
BIT() macro and use macros in place instead of
       enum TDM_CLKPOL clkpolity;
       enum TDM_ELM    elm;
       enum TDM_SYNCM  syncm;
       enum TDM_MASTER_SLAVE_MODE ms_mode;

These 1 tab indentation in defines seems a bit odd.

> +#define TDM_PCMTXCR                    0x04
> +       #define PCMTXCR_TXEN            BIT(0)
> +       #define IFL_BIT                 11
> +       #define WL_BIT                  8
> +       #define SSCALE_BIT              4
> +       #define SL_BIT                  2
> +       #define LRJ_BIT                 1
> +#define TDM_PCMRXCR                    0x08
> +       #define PCMRXCR_RXEN            BIT(0)
> +       #define PCMRXCR_RXSL_MASK       0xc

These:

> +       #define PCMRXCR_RXSL_16BIT      0x4
> +       #define PCMRXCR_RXSL_32BIT      0x8
> +       #define PCMRXCR_SCALE_MASK      0xf0
> +       #define PCMRXCR_SCALE_1CH       0x10

are not used

> +#define TDM_PCMDIV                     0x0c
> +
> +#define JH7110_TDM_FIFO                        0x170c0000
> +#define JH7110_TDM_FIFO_DEPTH          32
> +
> +enum TDM_MASTER_SLAVE_MODE {
> +       TDM_AS_MASTER = 0,
> +       TDM_AS_SLAVE,
> +};
> +
> +enum TDM_CLKPOL {
> +       /* tx raising and rx falling */
> +       TDM_TX_RASING_RX_FALLING = 0,
> +       /* tx falling and rx raising */
> +       TDM_TX_FALLING_RX_RASING,
> +};
> +
> +enum TDM_ELM {
> +       /* only work while SYNCM=0 */
> +       TDM_ELM_LATE = 0,
> +       TDM_ELM_EARLY,
> +};
> +
> +enum TDM_SYNCM {
> +       /* short frame sync */
> +       TDM_SYNCM_SHORT = 0,
> +       /* long frame sync */
> +       TDM_SYNCM_LONG,
> +};
> +
> +enum TDM_IFL {
> +       /* FIFO to send or received : half-1/2, Quarter-1/4 */
> +       TDM_FIFO_HALF = 0,
> +       TDM_FIFO_QUARTER,
> +};
> +
> +enum TDM_WL {
> +       /* send or received word length */
> +       TDM_8BIT_WORD_LEN = 0,
> +       TDM_16BIT_WORD_LEN,
> +       TDM_20BIT_WORD_LEN,
> +       TDM_24BIT_WORD_LEN,
> +       TDM_32BIT_WORD_LEN,
> +};
> +
> +enum TDM_SL {
> +       /* send or received slot length */
> +       TDM_8BIT_SLOT_LEN = 0,
> +       TDM_16BIT_SLOT_LEN,
> +       TDM_32BIT_SLOT_LEN,
> +};
> +
> +enum TDM_LRJ {
> +       /* left-justify or right-justify */
> +       TDM_RIGHT_JUSTIFY = 0,
> +       TDM_LEFT_JUSTIFT,
> +};
> +
> +struct tdm_chan_cfg {
> +       enum TDM_IFL ifl;
> +       enum TDM_WL  wl;
> +       unsigned char sscale;
> +       enum TDM_SL  sl;
> +       enum TDM_LRJ lrj;
> +       unsigned char enable;
> +};
> +
> +struct jh7110_tdm_dev {
> +       void __iomem *tdm_base;
> +       struct device *dev;
> +       struct clk_bulk_data clks[6];
> +       struct reset_control *resets;
> +
> +       enum TDM_CLKPOL clkpolity;
> +       enum TDM_ELM    elm;
> +       enum TDM_SYNCM  syncm;
> +       enum TDM_MASTER_SLAVE_MODE ms_mode;
> +
> +       struct tdm_chan_cfg tx;
> +       struct tdm_chan_cfg rx;
> +
> +       u16 syncdiv;
> +       u32 samplerate;
> +       u32 pcmclk;
> +
> +       /* data related to DMA transfers b/w tdm and DMAC */
> +       struct snd_dmaengine_dai_dma_data play_dma_data;
> +       struct snd_dmaengine_dai_dma_data capture_dma_data;
> +       u32 saved_pcmgbcr;
> +       u32 saved_pcmtxcr;
> +       u32 saved_pcmrxcr;
> +       u32 saved_pcmdiv;
> +};
> +
> +static inline u32 jh7110_tdm_readl(struct jh7110_tdm_dev *tdm, u16 reg)
> +{
> +       return readl_relaxed(tdm->tdm_base + reg);
> +}
> +
> +static inline void jh7110_tdm_writel(struct jh7110_tdm_dev *tdm, u16 reg, u32 val)
> +{
> +       writel_relaxed(val, tdm->tdm_base + reg);
> +}
> +
> +static void jh7110_tdm_save_context(struct jh7110_tdm_dev *tdm,
> +                                   struct snd_pcm_substream *substream)
> +{
> +       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +               tdm->saved_pcmtxcr = jh7110_tdm_readl(tdm, TDM_PCMTXCR);
> +       else
> +               tdm->saved_pcmrxcr = jh7110_tdm_readl(tdm, TDM_PCMRXCR);
> +}
> +
> +static void jh7110_tdm_start(struct jh7110_tdm_dev *tdm,
> +                            struct snd_pcm_substream *substream)
> +{
> +       u32 data;
> +
> +       data = jh7110_tdm_readl(tdm, TDM_PCMGBCR);
> +       jh7110_tdm_writel(tdm, TDM_PCMGBCR, data | PCMGBCR_ENABLE);
> +
> +       /* restore context */
> +       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +               jh7110_tdm_writel(tdm, TDM_PCMTXCR, tdm->saved_pcmtxcr | PCMTXCR_TXEN);
> +       else
> +               jh7110_tdm_writel(tdm, TDM_PCMRXCR, tdm->saved_pcmrxcr | PCMRXCR_RXEN);
> +}
> +
> +static void jh7110_tdm_stop(struct jh7110_tdm_dev *tdm,
> +                           struct snd_pcm_substream *substream)
> +{
> +       unsigned int val;
> +
> +       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> +               val = jh7110_tdm_readl(tdm, TDM_PCMTXCR);
> +               val &= ~PCMTXCR_TXEN;
> +               jh7110_tdm_writel(tdm, TDM_PCMTXCR, val);
> +       } else {
> +               val = jh7110_tdm_readl(tdm, TDM_PCMRXCR);
> +               val &= ~PCMRXCR_RXEN;
> +               jh7110_tdm_writel(tdm, TDM_PCMRXCR, val);
> +       }
> +}
> +
> +static int jh7110_tdm_syncdiv(struct jh7110_tdm_dev *tdm)
> +{
> +       u32 sl, sscale, syncdiv;
> +
> +       if (tdm->rx.sl >= tdm->tx.sl)
> +               sl = tdm->rx.sl;
> +       else
> +               sl = tdm->tx.sl;
> +
> +       if (tdm->rx.sscale >= tdm->tx.sscale)
> +               sscale = tdm->rx.sscale;
> +       else
> +               sscale = tdm->tx.sscale;
> +
> +       syncdiv = tdm->pcmclk / tdm->samplerate - 1;
> +
> +       if ((syncdiv + 1) < (sl * sscale)) {
> +               dev_err(tdm->dev, "Failed to set syncdiv!\n");
> +               return -EINVAL;
> +       }
> +
> +       if (tdm->syncm == TDM_SYNCM_LONG &&
> +           (tdm->rx.sscale <= 1 || tdm->tx.sscale <= 1) &&
> +           ((syncdiv + 1) <= sl)) {
> +               dev_err(tdm->dev, "Wrong syncdiv! It must be (syncdiv+1) > max[tx.sl, rx.sl]\n");
> +               return -EINVAL;
> +       }
> +
> +       jh7110_tdm_writel(tdm, TDM_PCMDIV, syncdiv);
> +       return 0;
> +}
> +
> +static int jh7110_tdm_config(struct jh7110_tdm_dev *tdm,
> +                            struct snd_pcm_substream *substream)
> +{
> +       u32 datarx, datatx;
> +       int ret;
> +
> +       ret = jh7110_tdm_syncdiv(tdm);
> +       if (ret)
> +               return ret;
> +
> +       datarx = (tdm->rx.ifl << IFL_BIT) |
> +                 (tdm->rx.wl << WL_BIT) |
> +                 (tdm->rx.sscale << SSCALE_BIT) |
> +                 (tdm->rx.sl << SL_BIT) |
> +                 (tdm->rx.lrj << LRJ_BIT);
> +
> +       datatx = (tdm->tx.ifl << IFL_BIT) |
> +                 (tdm->tx.wl << WL_BIT) |
> +                 (tdm->tx.sscale << SSCALE_BIT) |
> +                 (tdm->tx.sl << SL_BIT) |
> +                 (tdm->tx.lrj << LRJ_BIT);
> +
> +       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +               jh7110_tdm_writel(tdm, TDM_PCMTXCR, datatx);
> +       else
> +               jh7110_tdm_writel(tdm, TDM_PCMRXCR, datarx);
> +
> +       return 0;
> +}
> +
> +static void jh7110_tdm_clk_disable(struct jh7110_tdm_dev *tdm)
> +{
> +       clk_bulk_disable_unprepare(ARRAY_SIZE(tdm->clks), tdm->clks);
> +}
> +
> +static int jh7110_tdm_clk_enable(struct jh7110_tdm_dev *tdm)
> +{
> +       int ret;
> +
> +       ret = clk_bulk_prepare_enable(ARRAY_SIZE(tdm->clks), tdm->clks);
> +       if (ret) {
> +               dev_err(tdm->dev, "Failed to enable tdm clocks\n");
> +               return ret;
> +       }
> +
> +       ret = reset_control_deassert(tdm->resets);
> +       if (ret) {
> +               dev_err(tdm->dev, "Failed to deassert tdm resets\n");
> +               goto dis_tdm_clk;
> +       }
> +
> +       /* select tdm_ext clock as the clock source for tdm */
> +       ret = clk_set_parent(tdm->clks[5].clk, tdm->clks[4].clk);
> +       if (ret) {
> +               dev_err(tdm->dev, "Can't set extern clock source for clk_tdm\n");
> +               goto dis_tdm_clk;
> +       }
> +
> +       return 0;
> +
> +dis_tdm_clk:
> +       clk_bulk_disable_unprepare(ARRAY_SIZE(tdm->clks), tdm->clks);
> +
> +       return ret;
> +}
> +
> +static int jh7110_tdm_runtime_suspend(struct device *dev)
> +{
> +       struct jh7110_tdm_dev *tdm = dev_get_drvdata(dev);
> +
> +       jh7110_tdm_clk_disable(tdm);
> +       return 0;
> +}
> +
> +static int jh7110_tdm_runtime_resume(struct device *dev)
> +{
> +       struct jh7110_tdm_dev *tdm = dev_get_drvdata(dev);
> +
> +       return jh7110_tdm_clk_enable(tdm);
> +}
> +
> +static int jh7110_tdm_system_suspend(struct device *dev)
> +{
> +       struct jh7110_tdm_dev *tdm = dev_get_drvdata(dev);
> +
> +       /* save context */
> +       tdm->saved_pcmgbcr = jh7110_tdm_readl(tdm, TDM_PCMGBCR);
> +       tdm->saved_pcmdiv = jh7110_tdm_readl(tdm, TDM_PCMDIV);
> +
> +       return pm_runtime_force_suspend(dev);
> +}
> +
> +static int jh7110_tdm_system_resume(struct device *dev)
> +{
> +       struct jh7110_tdm_dev *tdm = dev_get_drvdata(dev);
> +
> +       /* restore context */
> +       jh7110_tdm_writel(tdm, TDM_PCMGBCR, tdm->saved_pcmgbcr);
> +       jh7110_tdm_writel(tdm, TDM_PCMDIV, tdm->saved_pcmdiv);
> +
> +       return pm_runtime_force_resume(dev);
> +}
> +
> +static const struct snd_soc_component_driver jh7110_tdm_component = {
> +       .name = "jh7110-tdm",
> +};
> +
> +static int jh7110_tdm_startup(struct snd_pcm_substream *substream,
> +                             struct snd_soc_dai *cpu_dai)
> +{
> +       struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
> +       struct snd_soc_dai_link *dai_link = rtd->dai_link;
> +
> +       dai_link->stop_dma_first = 1;
> +
> +       return 0;
> +}
> +
> +static int jh7110_tdm_hw_params(struct snd_pcm_substream *substream,
> +                               struct snd_pcm_hw_params *params,
> +                               struct snd_soc_dai *dai)
> +{
> +       struct jh7110_tdm_dev *tdm = snd_soc_dai_get_drvdata(dai);
> +       int chan_wl, chan_sl, chan_nr;
> +       unsigned int data_width;
> +       unsigned int dma_bus_width;
> +       struct snd_dmaengine_dai_dma_data *dma_data = NULL;
> +       int ret;
> +
> +       data_width = params_width(params);
> +
> +       tdm->samplerate = params_rate(params);
> +       tdm->pcmclk = params_channels(params) * tdm->samplerate * data_width;
> +
> +       switch (params_format(params)) {
> +       case SNDRV_PCM_FORMAT_S16_LE:
> +               chan_wl = TDM_16BIT_WORD_LEN;
> +               chan_sl = TDM_16BIT_SLOT_LEN;
> +               dma_bus_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> +               break;
> +
> +       case SNDRV_PCM_FORMAT_S32_LE:
> +               chan_wl = TDM_32BIT_WORD_LEN;
> +               chan_sl = TDM_32BIT_SLOT_LEN;
> +               dma_bus_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> +               break;
> +
> +       default:
> +               dev_err(tdm->dev, "tdm: unsupported PCM fmt");
> +               return -EINVAL;
> +       }
> +
> +       chan_nr = params_channels(params);
> +       switch (chan_nr) {
> +       case 1:
> +       case 2:
> +       case 4:
> +       case 6:
> +       case 8:
> +               break;
> +       default:
> +               dev_err(tdm->dev, "channel not supported\n");
> +               return -EINVAL;
> +       }
> +
> +       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
> +               tdm->tx.wl = chan_wl;
> +               tdm->tx.sl = chan_sl;
> +               tdm->tx.sscale = chan_nr;
> +               tdm->play_dma_data.addr_width = dma_bus_width;
> +               dma_data = &tdm->play_dma_data;
> +       } else {
> +               tdm->rx.wl = chan_wl;
> +               tdm->rx.sl = chan_sl;
> +               tdm->rx.sscale = chan_nr;
> +               tdm->capture_dma_data.addr_width = dma_bus_width;
> +               dma_data = &tdm->capture_dma_data;
> +       }
> +
> +       snd_soc_dai_set_dma_data(dai, substream, dma_data);
> +
> +       ret = jh7110_tdm_config(tdm, substream);
> +       if (ret)
> +               return ret;
> +
> +       jh7110_tdm_save_context(tdm, substream);
> +       return 0;
> +}
> +
> +static int jh7110_tdm_trigger(struct snd_pcm_substream *substream,
> +                             int cmd, struct snd_soc_dai *dai)
> +{
> +       struct jh7110_tdm_dev *tdm = snd_soc_dai_get_drvdata(dai);
> +       int ret = 0;
> +
> +       switch (cmd) {
> +       case SNDRV_PCM_TRIGGER_START:
> +       case SNDRV_PCM_TRIGGER_RESUME:
> +       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
> +               jh7110_tdm_start(tdm, substream);
> +               break;
> +
> +       case SNDRV_PCM_TRIGGER_STOP:
> +       case SNDRV_PCM_TRIGGER_SUSPEND:
> +       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> +               jh7110_tdm_stop(tdm, substream);
> +               break;
> +       default:
> +               ret = -EINVAL;
> +               break;
> +       }
> +
> +       return ret;
> +}
> +
> +static int jh7110_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai,
> +                                 unsigned int fmt)
> +{
> +       struct jh7110_tdm_dev *tdm = snd_soc_dai_get_drvdata(cpu_dai);
> +       unsigned int gbcr;
> +
> +       /* set master/slave audio interface */
> +       switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
> +       case SND_SOC_DAIFMT_BP_FP:
> +               /* cpu is master */
> +               tdm->ms_mode = TDM_AS_MASTER;
> +               break;
> +       case SND_SOC_DAIFMT_BC_FC:
> +               /* codec is master */
> +               tdm->ms_mode = TDM_AS_SLAVE;
> +               break;
> +       case SND_SOC_DAIFMT_BC_FP:
> +       case SND_SOC_DAIFMT_BP_FC:
> +               return -EINVAL;
> +       default:
> +               dev_dbg(tdm->dev, "dwc : Invalid clock provider format\n");
> +               return -EINVAL;
> +       }
> +
> +       gbcr = (tdm->clkpolity << CLKPOL_BIT) |
> +               (tdm->elm << ELM_BIT) |
> +               (tdm->syncm << SYNCM_BIT) |
> +               (tdm->ms_mode << MS_BIT);
> +       jh7110_tdm_writel(tdm, TDM_PCMGBCR, gbcr);
> +
> +       return 0;
> +}
> +
> +static const struct snd_soc_dai_ops jh7110_tdm_dai_ops = {
> +       .startup        = jh7110_tdm_startup,
> +       .hw_params      = jh7110_tdm_hw_params,
> +       .trigger        = jh7110_tdm_trigger,
> +       .set_fmt        = jh7110_tdm_set_dai_fmt,
> +};
> +
> +static int jh7110_tdm_dai_probe(struct snd_soc_dai *dai)
> +{
> +       struct jh7110_tdm_dev *tdm = snd_soc_dai_get_drvdata(dai);
> +
> +       snd_soc_dai_init_dma_data(dai, &tdm->play_dma_data, &tdm->capture_dma_data);
> +       snd_soc_dai_set_drvdata(dai, tdm);
> +       return 0;
> +}
> +
> +#define JH7110_TDM_RATES       SNDRV_PCM_RATE_8000_48000
> +
> +#define JH7110_TDM_FORMATS     (SNDRV_PCM_FMTBIT_S16_LE | \
> +                                SNDRV_PCM_FMTBIT_S32_LE)
> +
> +static struct snd_soc_dai_driver jh7110_tdm_dai = {
> +       .name = "sf_tdm",
> +       .id = 0,
> +       .playback = {
> +               .stream_name    = "Playback",
> +               .channels_min   = 1,
> +               .channels_max   = 8,
> +               .rates          = JH7110_TDM_RATES,
> +               .formats        = JH7110_TDM_FORMATS,
> +       },
> +       .capture = {
> +               .stream_name    = "Capture",
> +               .channels_min   = 1,
> +               .channels_max   = 8,
> +               .rates          = JH7110_TDM_RATES,
> +               .formats        = JH7110_TDM_FORMATS,
> +       },
> +       .ops = &jh7110_tdm_dai_ops,
> +       .probe = jh7110_tdm_dai_probe,
> +       .symmetric_rate = 1,
> +};
> +
> +static const struct snd_pcm_hardware jh7110_pcm_hardware = {
> +       .info                   = (SNDRV_PCM_INFO_MMAP          |
> +                                  SNDRV_PCM_INFO_MMAP_VALID    |
> +                                  SNDRV_PCM_INFO_PAUSE         |
> +                                  SNDRV_PCM_INFO_RESUME        |
> +                                  SNDRV_PCM_INFO_INTERLEAVED   |
> +                                  SNDRV_PCM_INFO_BLOCK_TRANSFER),
> +       .buffer_bytes_max       = 192512,
> +       .period_bytes_min       = 4096,
> +       .period_bytes_max       = 32768,
> +       .periods_min            = 1,
> +       .periods_max            = 48,
> +       .fifo_size              = 16,
> +};
> +
> +static const struct snd_dmaengine_pcm_config jh7110_dmaengine_pcm_config = {
> +       .pcm_hardware = &jh7110_pcm_hardware,
> +       .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
> +       .prealloc_buffer_size = 192512,
> +};
> +
> +static void jh7110_tdm_init_params(struct jh7110_tdm_dev *tdm)
> +{
> +       tdm->clkpolity = TDM_TX_RASING_RX_FALLING;
> +       tdm->elm = TDM_ELM_LATE;
> +       tdm->syncm = TDM_SYNCM_SHORT;
> +
> +       tdm->rx.ifl = TDM_FIFO_HALF;
> +       tdm->tx.ifl = TDM_FIFO_HALF;
> +       tdm->rx.wl = TDM_16BIT_WORD_LEN;
> +       tdm->tx.wl = TDM_16BIT_WORD_LEN;
> +       tdm->rx.sscale = 2;
> +       tdm->tx.sscale = 2;
> +       tdm->rx.lrj = TDM_LEFT_JUSTIFT;
> +       tdm->tx.lrj = TDM_LEFT_JUSTIFT;
> +
> +       tdm->play_dma_data.addr = JH7110_TDM_FIFO;
> +       tdm->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> +       tdm->play_dma_data.fifo_size = JH7110_TDM_FIFO_DEPTH / 2;
> +       tdm->play_dma_data.maxburst = 16;
> +
> +       tdm->capture_dma_data.addr = JH7110_TDM_FIFO;
> +       tdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> +       tdm->capture_dma_data.fifo_size = JH7110_TDM_FIFO_DEPTH / 2;
> +       tdm->capture_dma_data.maxburst = 8;
> +}
> +
> +static int jh7110_tdm_clk_reset_get(struct platform_device *pdev,
> +                                   struct jh7110_tdm_dev *tdm)
> +{
> +       int ret;
> +
> +       tdm->clks[0].id = "mclk_inner";
> +       tdm->clks[1].id = "tdm_ahb";
> +       tdm->clks[2].id = "tdm_apb";
> +       tdm->clks[3].id = "tdm_internal";
> +       tdm->clks[4].id = "tdm_ext";
> +       tdm->clks[5].id = "tdm";
> +
> +       ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(tdm->clks), tdm->clks);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to get tdm clocks\n");
> +               return ret;
> +       }
> +
> +       tdm->resets = devm_reset_control_array_get_exclusive(&pdev->dev);
> +       if (IS_ERR_OR_NULL(tdm->resets)) {

Looking in depth on devm_reset_control_array_get_exclusive() it seems the
NULL cannot be returned by devm_reset_control_array_get_exclusive() as
optinal argument is false, thus the IS_ERR() that was here on previous
version was good. Could you return back to that? Sorry for the confusion.

> +               ret = PTR_ERR(tdm->resets);
> +               dev_err(&pdev->dev, "Failed to get tdm resets");
> +               return ret;

Also, you could avoid this return
> +       }
> +
> +       return 0;

and do here:
	return ret;

Other than this:

Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>


> +}
> +
> +static int jh7110_tdm_probe(struct platform_device *pdev)
> +{
> +       struct jh7110_tdm_dev *tdm;
> +       int ret;
> +
> +       tdm = devm_kzalloc(&pdev->dev, sizeof(*tdm), GFP_KERNEL);
> +       if (!tdm)
> +               return -ENOMEM;
> +
> +       tdm->tdm_base = devm_platform_ioremap_resource(pdev, 0);
> +       if (IS_ERR(tdm->tdm_base))
> +               return PTR_ERR(tdm->tdm_base);
> +
> +       tdm->dev = &pdev->dev;
> +
> +       ret = jh7110_tdm_clk_reset_get(pdev, tdm);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to enable audio-tdm clock\n");
> +               return ret;
> +       }
> +
> +       jh7110_tdm_init_params(tdm);
> +
> +       dev_set_drvdata(&pdev->dev, tdm);
> +       ret = devm_snd_soc_register_component(&pdev->dev, &jh7110_tdm_component,
> +                                             &jh7110_tdm_dai, 1);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to register dai\n");
> +               return ret;
> +       }
> +
> +       ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
> +                                             &jh7110_dmaengine_pcm_config,
> +                                             SND_DMAENGINE_PCM_FLAG_COMPAT);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Could not register pcm: %d\n", ret);
> +               return ret;
> +       }
> +
> +       pm_runtime_enable(&pdev->dev);
> +       if (!pm_runtime_enabled(&pdev->dev)) {
> +               ret = jh7110_tdm_runtime_resume(&pdev->dev);
> +               if (ret)
> +                       goto err_pm_disable;
> +       }
> +
> +       return 0;
> +
> +err_pm_disable:
> +       pm_runtime_disable(&pdev->dev);
> +
> +       return ret;
> +}
> +
> +static int jh7110_tdm_dev_remove(struct platform_device *pdev)
> +{
> +       pm_runtime_disable(&pdev->dev);
> +       return 0;
> +}
> +
> +static const struct of_device_id jh7110_tdm_of_match[] = {
> +       { .compatible = "starfive,jh7110-tdm", },
> +       {}
> +};
> +
> +MODULE_DEVICE_TABLE(of, jh7110_tdm_of_match);
> +
> +static const struct dev_pm_ops jh7110_tdm_pm_ops = {
> +       RUNTIME_PM_OPS(jh7110_tdm_runtime_suspend,
> +                      jh7110_tdm_runtime_resume, NULL)
> +       SYSTEM_SLEEP_PM_OPS(jh7110_tdm_system_suspend,
> +                           jh7110_tdm_system_resume)
> +};
> +
> +static struct platform_driver jh7110_tdm_driver = {
> +       .driver = {
> +               .name = "jh7110-tdm",
> +               .of_match_table = jh7110_tdm_of_match,
> +               .pm = pm_ptr(&jh7110_tdm_pm_ops),
> +       },
> +       .probe = jh7110_tdm_probe,
> +       .remove = jh7110_tdm_dev_remove,
> +};
> +module_platform_driver(jh7110_tdm_driver);
> +
> +MODULE_DESCRIPTION("StarFive JH7110 TDM ASoC Driver");
> +MODULE_AUTHOR("Walker Chen <walker.chen@starfivetech.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.17.1
>