| Message ID | 20181215233823.1042-1-linus.walleij@linaro.org |
|---|---|
| Headers | show |
| Series | SPI CS using GPIO descriptors | expand |
On 2018/12/16 7:38, Linus Walleij wrote: > This converts the DesignWare (dw) SPI master driver to > use GPIO descriptors for chip select handling. > > This driver has a duplicate DT parser in addition to the > one in the core, sets up the line as non-asserted and > relies on the core to drive the GPIOs. > > It is a pretty straight-forward conversion. > > Cc: Talel Shenhar <talel@amazon.com> > Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> > Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> > Cc: Linuxarm <linuxarm@huawei.com> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> > --- > drivers/spi/spi-dw-mmio.c | 22 ---------------------- > drivers/spi/spi-dw.c | 9 +-------- > 2 files changed, 1 insertion(+), 30 deletions(-) > > diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c > index 3ffb6a40fe0c..00a43c19f2a4 100644 > --- a/drivers/spi/spi-dw-mmio.c > +++ b/drivers/spi/spi-dw-mmio.c > @@ -18,7 +18,6 @@ > #include <linux/mfd/syscon.h> > #include <linux/module.h> > #include <linux/of.h> > -#include <linux/of_gpio.h> > #include <linux/of_platform.h> > #include <linux/property.h> > #include <linux/regmap.h> > @@ -184,27 +183,6 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) > > dws->num_cs = num_cs; > > - if (pdev->dev.of_node) { > - int i; > - > - for (i = 0; i < dws->num_cs; i++) { > - int cs_gpio = of_get_named_gpio(pdev->dev.of_node, > - "cs-gpios", i); > - > - if (cs_gpio == -EPROBE_DEFER) { > - ret = cs_gpio; > - goto out; > - } > - > - if (gpio_is_valid(cs_gpio)) { > - ret = devm_gpio_request(&pdev->dev, cs_gpio, > - dev_name(&pdev->dev)); > - if (ret) > - goto out; > - } > - } > - } > - > init_func = device_get_match_data(&pdev->dev); > if (init_func) { > ret = init_func(pdev, dwsmmio); > diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c > index b705f2bdb8b9..22a7998dbc08 100644 > --- a/drivers/spi/spi-dw.c > +++ b/drivers/spi/spi-dw.c > @@ -20,7 +20,6 @@ > #include <linux/delay.h> > #include <linux/slab.h> > #include <linux/spi/spi.h> > -#include <linux/gpio.h> > > #include "spi-dw.h" > > @@ -425,13 +424,6 @@ static int dw_spi_setup(struct spi_device *spi) > > chip->tmode = SPI_TMOD_TR; > > - if (gpio_is_valid(spi->cs_gpio)) { > - ret = gpio_direction_output(spi->cs_gpio, > - !(spi->mode & SPI_CS_HIGH)); > - if (ret) > - return ret; > - } > - > return 0; > } > > @@ -496,6 +488,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) > goto err_free_master; > } > > + master->use_gpio_descriptors = true; > master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; > master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); > master->bus_num = dws->bus_num; > Hi, Linus for spi-dw-mmio(ACPI): Tested-by: Jay Fang <f.fangjian@huawei.com> Thank you, Jay
On 16/12/2018 00:38:23+0100, Linus Walleij wrote: > This converts the DesignWare (dw) SPI master driver to > use GPIO descriptors for chip select handling. > > This driver has a duplicate DT parser in addition to the > one in the core, sets up the line as non-asserted and > relies on the core to drive the GPIOs. > > It is a pretty straight-forward conversion. > > Cc: Talel Shenhar <talel@amazon.com> > Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com> > Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> > Cc: Linuxarm <linuxarm@huawei.com> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> The core part was on my todo list since early 2014, thank you to take care of that :) Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> > --- > drivers/spi/spi-dw-mmio.c | 22 ---------------------- > drivers/spi/spi-dw.c | 9 +-------- > 2 files changed, 1 insertion(+), 30 deletions(-) > > diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c > index 3ffb6a40fe0c..00a43c19f2a4 100644 > --- a/drivers/spi/spi-dw-mmio.c > +++ b/drivers/spi/spi-dw-mmio.c > @@ -18,7 +18,6 @@ > #include <linux/mfd/syscon.h> > #include <linux/module.h> > #include <linux/of.h> > -#include <linux/of_gpio.h> > #include <linux/of_platform.h> > #include <linux/property.h> > #include <linux/regmap.h> > @@ -184,27 +183,6 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) > > dws->num_cs = num_cs; > > - if (pdev->dev.of_node) { > - int i; > - > - for (i = 0; i < dws->num_cs; i++) { > - int cs_gpio = of_get_named_gpio(pdev->dev.of_node, > - "cs-gpios", i); > - > - if (cs_gpio == -EPROBE_DEFER) { > - ret = cs_gpio; > - goto out; > - } > - > - if (gpio_is_valid(cs_gpio)) { > - ret = devm_gpio_request(&pdev->dev, cs_gpio, > - dev_name(&pdev->dev)); > - if (ret) > - goto out; > - } > - } > - } > - > init_func = device_get_match_data(&pdev->dev); > if (init_func) { > ret = init_func(pdev, dwsmmio); > diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c > index b705f2bdb8b9..22a7998dbc08 100644 > --- a/drivers/spi/spi-dw.c > +++ b/drivers/spi/spi-dw.c > @@ -20,7 +20,6 @@ > #include <linux/delay.h> > #include <linux/slab.h> > #include <linux/spi/spi.h> > -#include <linux/gpio.h> > > #include "spi-dw.h" > > @@ -425,13 +424,6 @@ static int dw_spi_setup(struct spi_device *spi) > > chip->tmode = SPI_TMOD_TR; > > - if (gpio_is_valid(spi->cs_gpio)) { > - ret = gpio_direction_output(spi->cs_gpio, > - !(spi->mode & SPI_CS_HIGH)); > - if (ret) > - return ret; > - } > - > return 0; > } > > @@ -496,6 +488,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) > goto err_free_master; > } > > + master->use_gpio_descriptors = true; > master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; > master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); > master->bus_num = dws->bus_num; > -- > 2.19.2 > -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com