* [PATCH 3/4] gpio: Add ROHM BD9571MWV-M PMIC GPIO driver
[not found] <20170416180801.17828-1-marek.vasut+renesas@gmail.com>
@ 2017-04-16 18:08 ` Marek Vasut
2017-04-24 13:55 ` Linus Walleij
0 siblings, 1 reply; 3+ messages in thread
From: Marek Vasut @ 2017-04-16 18:08 UTC (permalink / raw)
To: linux-renesas-soc
Cc: Marek Vasut, linux-gpio, Geert Uytterhoeven, Linus Walleij
Add driver for the GPIO block in the ROHM BD9571MWV-W MFD PMIC.
This block is pretty trivial and supports setting GPIO direction
as Input/Output and in case of Output, supports setting value.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: linux-gpio@vger.kernel.org
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Linus Walleij <linus.walleij@linaro.org>
---
drivers/gpio/Kconfig | 11 ++++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-bd9571mwv.c | 144 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 156 insertions(+)
create mode 100644 drivers/gpio/gpio-bd9571mwv.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 63ceed246b6f..62f810a8663c 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -844,6 +844,17 @@ config GPIO_ARIZONA
help
Support for GPIOs on Wolfson Arizona class devices.
+config GPIO_BD9571MWV
+ tristate "ROHM BD9571 GPIO support"
+ depends on MFD_BD9571MWV
+ help
+ Support for GPIOs on ROHM BD9571 PMIC. There are two GPIOs
+ available on the ROHM PMIC in total, both of which can also
+ generate interrupts.
+
+ This driver can also be built as a module. If so, the module
+ will be called gpio-bd9571mwv.
+
config GPIO_CRYSTAL_COVE
tristate "GPIO support for Crystal Cove PMIC"
depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 095598e856ca..68b96277d9fa 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o
obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o
obj-$(CONFIG_GPIO_AXP209) += gpio-axp209.o
obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
+obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o
obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
diff --git a/drivers/gpio/gpio-bd9571mwv.c b/drivers/gpio/gpio-bd9571mwv.c
new file mode 100644
index 000000000000..8495f25c735a
--- /dev/null
+++ b/drivers/gpio/gpio-bd9571mwv.c
@@ -0,0 +1,144 @@
+/*
+ * ROHM BD9571MWV-M GPIO driver
+ *
+ * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License version 2 for more details.
+ *
+ * Based on the TPS65086 driver
+ *
+ * NOTE: Interrupts are not supported yet.
+ */
+
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/bd9571mwv.h>
+
+struct bd9571mwv_gpio {
+ struct gpio_chip chip;
+ struct bd9571mwv *bd;
+};
+
+static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
+ if (ret < 0)
+ return ret;
+
+ return val & BIT(offset);
+}
+
+static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+
+ regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
+ BIT(offset), 0);
+
+ return 0;
+}
+
+static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+
+ /* Set the initial value */
+ regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
+ BIT(offset), value ? BIT(offset) : 0);
+ regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
+ BIT(offset), BIT(offset));
+
+ return 0;
+}
+
+static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
+ if (ret < 0)
+ return ret;
+
+ return val & BIT(offset);
+}
+
+static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+
+ regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
+ BIT(offset), value ? BIT(offset) : 0);
+}
+
+static const struct gpio_chip template_chip = {
+ .label = "bd9571mwv-gpio",
+ .owner = THIS_MODULE,
+ .get_direction = bd9571mwv_gpio_get_direction,
+ .direction_input = bd9571mwv_gpio_direction_input,
+ .direction_output = bd9571mwv_gpio_direction_output,
+ .get = bd9571mwv_gpio_get,
+ .set = bd9571mwv_gpio_set,
+ .base = -1,
+ .ngpio = 2,
+ .can_sleep = true,
+};
+
+static int bd9571mwv_gpio_probe(struct platform_device *pdev)
+{
+ struct bd9571mwv_gpio *gpio;
+ int ret;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, gpio);
+
+ gpio->bd = dev_get_drvdata(pdev->dev.parent);
+ gpio->chip = template_chip;
+ gpio->chip.parent = gpio->bd->dev;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
+ { "bd9571mwv-gpio", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
+
+static struct platform_driver bd9571mwv_gpio_driver = {
+ .driver = {
+ .name = "bd9571mwv-gpio",
+ },
+ .probe = bd9571mwv_gpio_probe,
+ .id_table = bd9571mwv_gpio_id_table,
+};
+module_platform_driver(bd9571mwv_gpio_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
+MODULE_DESCRIPTION("BD9571MWV GPIO driver");
+MODULE_LICENSE("GPL v2");
--
2.11.0
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