From patchwork Mon Mar 8 10:43:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vaittinen, Matti" X-Patchwork-Id: 395702 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F491C433E6 for ; Mon, 8 Mar 2021 10:44:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14544651E8 for ; Mon, 8 Mar 2021 10:44:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229754AbhCHKnz (ORCPT ); Mon, 8 Mar 2021 05:43:55 -0500 Received: from mail-lj1-f170.google.com ([209.85.208.170]:43490 "EHLO mail-lj1-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231395AbhCHKn3 (ORCPT ); Mon, 8 Mar 2021 05:43:29 -0500 Received: by mail-lj1-f170.google.com with SMTP id m11so15414454lji.10; Mon, 08 Mar 2021 02:43:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=or8/OvmRdpTwfghphxRxbPIJB/A4waJX4oL1SuGdJow=; b=O7Q/E7U2OWhVcf6XZYB0mO2XIMVhAOQ49ItiN+f2Ihx7nKV7SHBxFJVkN7tZfmAxwh hCuDKixQk7LYLC0HVW9mmggeYN+sdfMxKE3Jh7kFQ25IZjSMM9g1bKB+Aw0XNKr/2fmX 4FTHive7vKF75B9jMbqAHoKaHl1BLDB6r8PXst+IVab0pnNmGF6hTMZ1yOueTl3fR/Qn SEj3x42tcUOF091KnawA1non1tDHAANvfY4GFwUxM2qoSMDWLmGubO9Zlpm3Ol6G/WkM XoYEW5UzAC32o2jhbFv8nyaKo4+ECYdxswtSBwWB6BXs8hx7GgiNN3fxoLkNNUFhUZOu o2Sw== X-Gm-Message-State: AOAM531a0U0scG7RzHwcK8FNkCJ84lh2XM3ldNrsbbNEuNqNJizFMFXQ 0T/p/UM/LJLP74CI7ya57hQ= X-Google-Smtp-Source: ABdhPJwMjfyu7zp9wmHo32ZpgM2TYuqj4LEUZfzQ3wITD37TsZ7f9i4m4iy78FMLqtdzJdjwXkLneQ== X-Received: by 2002:a2e:9704:: with SMTP id r4mr13291480lji.486.1615200207580; Mon, 08 Mar 2021 02:43:27 -0800 (PST) Received: from localhost.localdomain (dc7vkhyyyyyyyyyyyyycy-3.rev.dnainternet.fi. [2001:14ba:16e2:8300::4]) by smtp.gmail.com with ESMTPSA id y22sm1447103ljg.32.2021.03.08.02.43.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Mar 2021 02:43:27 -0800 (PST) Date: Mon, 8 Mar 2021 12:43:21 +0200 From: Matti Vaittinen To: matti.vaittinen@fi.rohmeurope.com, mazziesaccount@gmail.com Cc: Lee Jones , Rob Herring , Matti Vaittinen , Linus Walleij , Bartosz Golaszewski , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-power@fi.rohmeurope.com, linux-gpio@vger.kernel.org Subject: [PATCH v3 08/15] gpio: support ROHM BD71815 GPOs Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Support GPO(s) found from ROHM BD71815 power management IC. The IC has two GPO pins but only one is properly documented in data-sheet. The driver exposes by default only the documented GPO. The second GPO is connected to E5 pin and is marked as GND in data-sheet. Control for this undocumented pin can be enabled using a special DT property. This driver is derived from work by Peter Yang although not so much of original is left. Signed-off-by: Matti Vaittinen --- Changes since v2: - minor clean-ups / styling suggested by Bartosz drivers/gpio/Kconfig | 10 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-bd71815.c | 176 ++++++++++++++++++++++++++++++++++++ 3 files changed, 187 insertions(+) create mode 100644 drivers/gpio/gpio-bd71815.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e3607ec4c2e8..d3b3de514f6e 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1105,6 +1105,16 @@ config GPIO_BD70528 This driver can also be built as a module. If so, the module will be called gpio-bd70528. +config GPIO_BD71815 + tristate "ROHM BD71815 PMIC GPIO support" + depends on MFD_ROHM_BD71828 + help + Support for GPO(s) on ROHM BD71815 PMIC. There are two GPOs + available on the ROHM PMIC. + + This driver can also be built as a module. If so, the module + will be called gpio-bd71815. + config GPIO_BD71828 tristate "ROHM BD71828 GPIO support" depends on MFD_ROHM_BD71828 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index c58a90a3c3b1..4c12f31db31f 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o obj-$(CONFIG_GPIO_BCM_XGS_IPROC) += gpio-xgs-iproc.o obj-$(CONFIG_GPIO_BD70528) += gpio-bd70528.o +obj-$(CONFIG_GPIO_BD71815) += gpio-bd71815.o obj-$(CONFIG_GPIO_BD71828) += gpio-bd71828.o obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o diff --git a/drivers/gpio/gpio-bd71815.c b/drivers/gpio/gpio-bd71815.c new file mode 100644 index 000000000000..5552a23c8e53 --- /dev/null +++ b/drivers/gpio/gpio-bd71815.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support to GPOs on ROHM BD71815 + */ + +#include +#include +#include +/* For the BD71815 register definitions */ +#include +#include +#include +#include + +struct bd71815_gpio { + struct gpio_chip chip; + struct device *dev; + struct regmap *regmap; + /* + * Sigh. The BD71815 and BD71817 were originally designed to support two + * GPO pins. At some point it was noticed the second GPO pin which is + * the E5 pin located at the center of IC is hard to use on PCB (due to + * the location). It was decided to not promote this second GPO and pin + * is marked as GND on the data-sheet. The functionality is still there + * though! I guess driving GPO connected to ground is a bad idea. Thus + * we do not support it by default. OTOH - the original driver written + * by colleagues at Embest did support controlling this second GPO. It + * is thus possible this is used in some of the products. + * + * This driver does not by default support configuring this second GPO + * but allows using it by providing the DT property + * "rohm,enable-hidden-gpo". + */ + bool e5_pin_is_gpo; +}; + +static int bd71815gpo_get(struct gpio_chip *chip, unsigned int offset) +{ + struct bd71815_gpio *bd71815 = gpiochip_get_data(chip); + int ret = 0; + int val; + + ret = regmap_read(bd71815->regmap, BD71815_REG_GPO, &val); + if (ret) + return ret; + + return (val >> offset) & 1; +} + +static void bd71815gpo_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct bd71815_gpio *bd71815 = gpiochip_get_data(chip); + int ret, bit; + + if (!bd71815->e5_pin_is_gpo && offset) + return; + + bit = BIT(offset); + + if (value) + ret = regmap_set_bits(bd71815->regmap, BD71815_REG_GPO, bit); + else + ret = regmap_clear_bits(bd71815->regmap, BD71815_REG_GPO, bit); + + if (ret) + dev_warn(bd71815->dev, "failed to toggle GPO\n"); +} + +static int bd71815_gpio_set_config(struct gpio_chip *chip, unsigned int offset, + unsigned long config) +{ + struct bd71815_gpio *bdgpio = gpiochip_get_data(chip); + + if (!bdgpio->e5_pin_is_gpo && offset) + return -EOPNOTSUPP; + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + return regmap_update_bits(bdgpio->regmap, + BD71815_REG_GPO, + BD71815_GPIO_DRIVE_MASK << offset, + BD71815_GPIO_OPEN_DRAIN << offset); + case PIN_CONFIG_DRIVE_PUSH_PULL: + return regmap_update_bits(bdgpio->regmap, + BD71815_REG_GPO, + BD71815_GPIO_DRIVE_MASK << offset, + BD71815_GPIO_CMOS << offset); + default: + break; + } + return -EOPNOTSUPP; +} + +/* BD71815 GPIO is actually GPO */ +static int bd71815gpo_direction_get(struct gpio_chip *gc, unsigned int offset) +{ + return GPIO_LINE_DIRECTION_OUT; +} + +/* Template for GPIO chip */ +static const struct gpio_chip bd71815gpo_chip = { + .label = "bd71815", + .owner = THIS_MODULE, + .get = bd71815gpo_get, + .get_direction = bd71815gpo_direction_get, + .set = bd71815gpo_set, + .set_config = bd71815_gpio_set_config, + .can_sleep = 1, +}; + +static int gpo_bd71815_probe(struct platform_device *pdev) +{ + int ret; + struct bd71815_gpio *g; + struct device *dev; + struct device *parent; + + /* + * Bind devm lifetime to this platform device => use dev for devm. + * also the prints should originate from this device. + */ + dev = &pdev->dev; + /* The device-tree and regmap come from MFD => use parent for that */ + parent = dev->parent; + + g = devm_kzalloc(dev, sizeof(*g), GFP_KERNEL); + if (!g) + return -ENOMEM; + + g->e5_pin_is_gpo = of_property_read_bool(parent->of_node, + "rohm,enable-hidden-gpo"); + g->chip = bd71815gpo_chip; + g->chip.base = -1; + + if (g->e5_pin_is_gpo) + g->chip.ngpio = 2; + else + g->chip.ngpio = 1; + + g->chip.parent = parent; + g->chip.of_node = parent->of_node; + g->regmap = dev_get_regmap(parent, NULL); + g->dev = dev; + + ret = devm_gpiochip_add_data(dev, &g->chip, g); + if (ret < 0) { + dev_err(dev, "could not register gpiochip, %d\n", ret); + return ret; + } + + return ret; +} +static const struct platform_device_id bd7181x_gpo_id[] = { + { "bd71815-gpo" }, + { }, +}; +MODULE_DEVICE_TABLE(platform, bd7181x_gpo_id); + +static struct platform_driver gpo_bd71815_driver = { + .driver = { + .name = "bd71815-gpo", + .owner = THIS_MODULE, + }, + .probe = gpo_bd71815_probe, + .id_table = bd7181x_gpo_id, +}; + +module_platform_driver(gpo_bd71815_driver); + +/* Note: this hardware lives inside an I2C-based multi-function device. */ +MODULE_ALIAS("platform:bd71815-gpo"); + +MODULE_AUTHOR("Peter Yang "); +MODULE_DESCRIPTION("GPO interface for BD71815"); +MODULE_LICENSE("GPL");