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Subject[RESEND PATCH v3 3/3] pinctrl: da9062: add driver support
Date
The DA9062 is a mfd pmic device which supports 5 GPIOs. The GPIOs can
be used as input, output or have a special use-case.

The patch adds the support for the normal input/output use-case.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
Changelog:

v3:
- add comment for gpio private include
- add missing bits.h include
- add pin_config state container and set initial pin state to push-pull
- make use of GPIO_LINE_DIRECTION_{IN,OUT}
- update MAINTAINERS entry -> gpio-da90??.c already covered but not
pinctrl-da90??.c

v2:
- fix minor style issue
- move from drivers/gpio to drivers/pinctrl
- Fix spelling issue
- rename local gpio_dir to gpio_mode
- Add datasheet reference and TODO notes
- move gpio to mfd-root node to avoid hierarchical interrupt chips
- Add gpio-controller property check
- remove of_device_id since we drop the gpio of-subnode
- Drop da9062_gpio_get_hwgpio

MAINTAINERS | 1 +
drivers/pinctrl/Kconfig | 12 ++
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-da9062.c | 297 +++++++++++++++++++++++++++++++
4 files changed, 311 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-da9062.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 296de2b51c83..2b680790fdf8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4837,6 +4837,7 @@ F: drivers/leds/leds-da90??.c
F: drivers/mfd/da903x.c
F: drivers/mfd/da90??-*.c
F: drivers/mfd/da91??-*.c
+F: drivers/pinctrl/pinctrl-da90??.c
F: drivers/power/supply/da9052-battery.c
F: drivers/power/supply/da91??-*.c
F: drivers/regulator/da903x.c
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index b372419d61f2..977787c158cc 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -126,6 +126,18 @@ config PINCTRL_DA850_PUPD
Driver for TI DA850/OMAP-L138/AM18XX pinconf. Used to control
pullup/pulldown pin groups.

+config PINCTRL_DA9062
+ tristate "Dialog Semiconductor DA9062 PMIC pinctrl and GPIO Support"
+ depends on MFD_DA9062
+ select GPIOLIB
+ help
+ The Dialog DA9062 PMIC provides multiple GPIOs that can be muxed for
+ different functions. This driver bundles a pinctrl driver to select the
+ function muxing and a GPIO driver to handle the GPIO when the GPIO
+ function is selected.
+
+ Say yes to enable pinctrl and GPIO support for the DA9062 PMIC.
+
config PINCTRL_DIGICOLOR
bool
depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST)
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index ac537fdbc998..2397684cbe11 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_AT91PIO4) += pinctrl-at91-pio4.o
obj-$(CONFIG_PINCTRL_AMD) += pinctrl-amd.o
obj-$(CONFIG_PINCTRL_BM1880) += pinctrl-bm1880.o
obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o
+obj-$(CONFIG_PINCTRL_DA9062) += pinctrl-da9062.o
obj-$(CONFIG_PINCTRL_DIGICOLOR) += pinctrl-digicolor.o
obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
obj-$(CONFIG_PINCTRL_GEMINI) += pinctrl-gemini.o
diff --git a/drivers/pinctrl/pinctrl-da9062.c b/drivers/pinctrl/pinctrl-da9062.c
new file mode 100644
index 000000000000..39f13fcbd3a8
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-da9062.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Dialog DA9062 pinctrl and GPIO driver.
+ * Based on DA9055 GPIO driver.
+ *
+ * TODO:
+ * - add pinmux and pinctrl support (gpio alternate mode)
+ *
+ * Documents:
+ * [1] https://www.dialog-semiconductor.com/sites/default/files/da9062_datasheet_3v6.pdf
+ *
+ * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
+ */
+#include <linux/bits.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/gpio/driver.h>
+
+#include <linux/mfd/da9062/core.h>
+#include <linux/mfd/da9062/registers.h>
+
+/*
+ * We need this get the gpio_desc from a <gpio_chip,offset> tuple to decide if
+ * the gpio is active low without a vendor specific dt-binding.
+ */
+#include <../gpio/gpiolib.h>
+
+#define DA9062_TYPE(offset) (4 * (offset % 2))
+#define DA9062_PIN_SHIFT(offset) (4 * (offset % 2))
+#define DA9062_PIN_ALTERNATE 0x00 /* gpio alternate mode */
+#define DA9062_PIN_GPI 0x01 /* gpio in */
+#define DA9062_PIN_GPO_OD 0x02 /* gpio out open-drain */
+#define DA9062_PIN_GPO_PP 0x03 /* gpio out push-pull */
+#define DA9062_GPIO_NUM 5
+
+struct da9062_pctl {
+ struct da9062 *da9062;
+ struct gpio_chip gc;
+ unsigned int pin_config[DA9062_GPIO_NUM];
+};
+
+static int da9062_pctl_get_pin_mode(struct da9062_pctl *pctl,
+ unsigned int offset)
+{
+ struct regmap *regmap = pctl->da9062->regmap;
+ int ret, val;
+
+ ret = regmap_read(regmap, DA9062AA_GPIO_0_1 + (offset >> 1), &val);
+ if (ret < 0)
+ return ret;
+
+ val >>= DA9062_PIN_SHIFT(offset);
+ val &= DA9062AA_GPIO0_PIN_MASK;
+
+ return val;
+}
+
+static int da9062_pctl_set_pin_mode(struct da9062_pctl *pctl,
+ unsigned int offset, unsigned int mode_req)
+{
+ struct regmap *regmap = pctl->da9062->regmap;
+ unsigned int mode = mode_req;
+ unsigned int mask;
+ int ret;
+
+ mode &= DA9062AA_GPIO0_PIN_MASK;
+ mode <<= DA9062_PIN_SHIFT(offset);
+ mask = DA9062AA_GPIO0_PIN_MASK << DA9062_PIN_SHIFT(offset);
+
+ ret = regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
+ mask, mode);
+ if (!ret)
+ pctl->pin_config[offset] = mode_req;
+
+ return ret;
+}
+
+static int da9062_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ struct regmap *regmap = pctl->da9062->regmap;
+ int gpio_mode, val;
+ int ret;
+
+ gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
+ if (gpio_mode < 0)
+ return gpio_mode;
+
+ switch (gpio_mode) {
+ case DA9062_PIN_ALTERNATE:
+ return -ENOTSUPP;
+ case DA9062_PIN_GPI:
+ ret = regmap_read(regmap, DA9062AA_STATUS_B, &val);
+ if (ret < 0)
+ return ret;
+ break;
+ case DA9062_PIN_GPO_OD:
+ case DA9062_PIN_GPO_PP:
+ ret = regmap_read(regmap, DA9062AA_GPIO_MODE0_4, &val);
+ if (ret < 0)
+ return ret;
+ }
+
+ return !!(val & BIT(offset));
+}
+
+static void da9062_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ struct regmap *regmap = pctl->da9062->regmap;
+
+ regmap_update_bits(regmap, DA9062AA_GPIO_MODE0_4, BIT(offset),
+ value << offset);
+}
+
+static int da9062_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ int gpio_mode;
+
+ gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
+ if (gpio_mode < 0)
+ return gpio_mode;
+
+ switch (gpio_mode) {
+ case DA9062_PIN_ALTERNATE:
+ return -ENOTSUPP;
+ case DA9062_PIN_GPI:
+ return GPIO_LINE_DIRECTION_IN;
+ case DA9062_PIN_GPO_OD:
+ case DA9062_PIN_GPO_PP:
+ return GPIO_LINE_DIRECTION_OUT;
+ }
+
+ return -EINVAL;
+}
+
+static int da9062_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ struct regmap *regmap = pctl->da9062->regmap;
+ struct gpio_desc *desc = gpiochip_get_desc(gc, offset);
+ unsigned int gpi_type;
+ int ret;
+
+ ret = da9062_pctl_set_pin_mode(pctl, offset, DA9062_PIN_GPI);
+ if (ret)
+ return ret;
+
+ /*
+ * If the gpio is active low we should set it in hw too. No worries
+ * about gpio_get() because we read and return the gpio-level. So the
+ * gpiolib active_low handling is still correct.
+ *
+ * 0 - active low, 1 - active high
+ */
+ gpi_type = !gpiod_is_active_low(desc);
+
+ return regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1),
+ DA9062AA_GPIO0_TYPE_MASK << DA9062_TYPE(offset),
+ gpi_type << DA9062_TYPE(offset));
+}
+
+static int da9062_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ unsigned int pin_config = pctl->pin_config[offset];
+ int ret;
+
+ ret = da9062_pctl_set_pin_mode(pctl, offset, pin_config);
+ if (ret)
+ return ret;
+
+ da9062_gpio_set(gc, offset, value);
+
+ return 0;
+}
+
+static int da9062_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
+ unsigned long config)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ struct regmap *regmap = pctl->da9062->regmap;
+ int gpio_mode;
+
+ /*
+ * We need to meet the following restrictions [1, Figure 18]:
+ * - PIN_CONFIG_BIAS_PULL_DOWN -> only allowed if the pin is used as
+ * gpio input
+ * - PIN_CONFIG_BIAS_PULL_UP -> only allowed if the pin is used as
+ * gpio output open-drain.
+ */
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
+ if (gpio_mode < 0)
+ return -EINVAL;
+ else if (gpio_mode != DA9062_PIN_GPI)
+ return -ENOTSUPP;
+ return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
+ BIT(offset), BIT(offset));
+ case PIN_CONFIG_BIAS_PULL_UP:
+ gpio_mode = da9062_pctl_get_pin_mode(pctl, offset);
+ if (gpio_mode < 0)
+ return -EINVAL;
+ else if (gpio_mode != DA9062_PIN_GPO_OD)
+ return -ENOTSUPP;
+ return regmap_update_bits(regmap, DA9062AA_CONFIG_K,
+ BIT(offset), BIT(offset));
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ return da9062_pctl_set_pin_mode(pctl, offset,
+ DA9062_PIN_GPO_OD);
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ return da9062_pctl_set_pin_mode(pctl, offset,
+ DA9062_PIN_GPO_PP);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int da9062_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
+{
+ struct da9062_pctl *pctl = gpiochip_get_data(gc);
+ struct da9062 *da9062 = pctl->da9062;
+
+ return regmap_irq_get_virq(da9062->regmap_irq,
+ DA9062_IRQ_GPI0 + offset);
+}
+
+static const struct gpio_chip reference_gc = {
+ .owner = THIS_MODULE,
+ .get = da9062_gpio_get,
+ .set = da9062_gpio_set,
+ .get_direction = da9062_gpio_get_direction,
+ .direction_input = da9062_gpio_direction_input,
+ .direction_output = da9062_gpio_direction_output,
+ .set_config = da9062_gpio_set_config,
+ .to_irq = da9062_gpio_to_irq,
+ .can_sleep = true,
+ .ngpio = DA9062_GPIO_NUM,
+ .base = -1,
+};
+
+static int da9062_pctl_probe(struct platform_device *pdev)
+{
+ struct device *parent = pdev->dev.parent;
+ struct da9062_pctl *pctl;
+ int i;
+
+ pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
+ if (!pctl)
+ return -ENOMEM;
+
+ pctl->da9062 = dev_get_drvdata(parent);
+ if (!pctl->da9062)
+ return -EINVAL;
+
+ if (!device_property_present(parent, "gpio-controller"))
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(pctl->pin_config); i++)
+ pctl->pin_config[i] = DA9062_PIN_GPO_PP;
+
+ /*
+ * Currently the driver handles only the GPIO support. The
+ * pinctrl/pinmux support can be added later if needed.
+ */
+ pctl->gc = reference_gc;
+ pctl->gc.label = dev_name(&pdev->dev);
+ pctl->gc.parent = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+ pctl->gc.of_node = parent->of_node;
+#endif
+
+ platform_set_drvdata(pdev, pctl);
+
+ return devm_gpiochip_add_data(&pdev->dev, &pctl->gc, pctl);
+}
+
+static struct platform_driver da9062_pctl_driver = {
+ .probe = da9062_pctl_probe,
+ .driver = {
+ .name = "da9062-gpio",
+ },
+};
+module_platform_driver(da9062_pctl_driver);
+
+MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de>");
+MODULE_DESCRIPTION("DA9062 PMIC pinctrl and GPIO Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9062-gpio");
--
2.20.1
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