Driver for the GPIO block found in ti's tps65218 pmics.
The device has two GPIOs and one GPO pin which can be configured as follows:
GPIO1:
-general-purpose, open-drain output controlled by GPO1 user bit and/or
sequencer
-DDR3 reset input signal from SOC. Signal is either latched or
passed-trough to GPO2 pin. See below for details.
GPO2:
-general-purpose output controlled by GPO2 user bit
-DDR3 reset output signal. Signal is controlled by GPIO1 and PGOOD.
See below for details.
-Output buffer can be configured as open-drain or push-pull.
GPIO3:
-general-purpose, open-drain output controlled by GPO3 user bit and/or
sequencer
-reset input-signal for DCDC1 and DCDC2.
The input configurations are not meant to be used by the user so the driver
only offers GPOs. Also GPO2 is set-up as open drain by default.
Signed-off-by: Nicolas Saenz Julienne <nicolassae...@gmail.com>
---
drivers/gpio/Kconfig | 7 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-tps65218.c | 165 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 173 insertions(+)
create mode 100644 drivers/gpio/gpio-tps65218.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 63000b1..1669898 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -822,6 +822,13 @@ config GPIO_TIMBERDALE
---help---
Add support for the GPIO IP in the timberdale FPGA.
+config GPIO_TPS65218
+ tristate "TPS65218 GPIO"
+ depends on MFD_TPS65218
+ help
+ Select this option to enable GPIO driver for the TPS65218
+ chip family.
+
config GPIO_TPS6586X
bool "TPS6586X GPIO"
depends on MFD_TPS6586X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 77a07e9..d4bd2f9 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o
obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
+obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
diff --git a/drivers/gpio/gpio-tps65218.c b/drivers/gpio/gpio-tps65218.c
new file mode 100644
index 0000000..a0b3d52
--- /dev/null
+++ b/drivers/gpio/gpio-tps65218.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright 2015 Verifone Int.
+ *
+ * Author: Nicolas Saenz Julienne <nicolassae...@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify i t
+ * under the terms of the GNU General Public License as published by th e
+ * Free Software Foundation; either version 2 of the License, or (at you r
+ * option) any later version.
+ *
+ * This driver is based on the gpio-tps65912 implementation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/tps65218.h>
+
+struct tps65218_gpio {
+ struct tps65218 *tps65218;
+ struct gpio_chip gpio_chip;
+};
+
+#define to_tg(gc) container_of(gc, struct tps65218_gpio, gpio_chip)
+
+static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65218_gpio *tps65218_gpio = to_tg(gc);
+ struct tps65218 *tps65218 = tps65218_gpio->tps65218;
+ unsigned int val;
+ int ret;
+
+ ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
+ if (ret)
+ return ret;
+
+ return val & (TPS65218_ENABLE2_GPIO1 << offset);
+}
+
+static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps65218_gpio *tps65218_gpio = to_tg(gc);
+ struct tps65218 *tps65218 = tps65218_gpio->tps65218;
+
+ if (value)
+ tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
+ TPS65218_ENABLE2_GPIO1 << offset,
+ TPS65218_ENABLE2_GPIO1 << offset,
+ TPS65218_PROTECT_L1);
+ else
+ tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
+ TPS65218_ENABLE2_GPIO1 << offset,
+ TPS65218_PROTECT_L1);
+}
+
+static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ /* Only drives GPOs */
+ return 0;
+}
+
+static struct gpio_chip template_chip = {
+ .label = "gpio-tps65218",
+ .owner = THIS_MODULE,
+ .direction_output = tps65218_gpio_output,
+ .get = tps65218_gpio_get,
+ .set = tps65218_gpio_set,
+ .can_sleep = true,
+ .ngpio = 3,
+ .base = -1,
+};
+
+static int tps65218_setup_gpos(struct tps65218_gpio *tps65218_gpio)
+{
+ struct tps65218 *tps65218 = tps65218_gpio->tps65218;
+ int ret;
+
+ /* Disable sequencer for GPO1 and GP03 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7, 0xFF,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ /* Setup GPO1 and GPO2 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
+ TPS65218_CONFIG1_IO1_SEL |
+ TPS65218_CONFIG1_GPO2_BUF,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ /* Setup GPO3 */
+ return tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
+ TPS65218_CONFIG2_DC12_RST,
+ TPS65218_PROTECT_L1);
+}
+
+static int tps65218_gpio_probe(struct platform_device *pdev)
+{
+ struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
+ struct tps65218_gpio *tps65218_gpio;
+ int ret;
+
+ tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
+ GFP_KERNEL);
+ if (!tps65218_gpio)
+ return -ENOMEM;
+
+ tps65218_gpio->tps65218 = tps65218;
+ tps65218_gpio->gpio_chip = template_chip;
+ tps65218_gpio->gpio_chip.dev = &pdev->dev;
+ tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
+
+ ret = tps65218_setup_gpos(tps65218_gpio);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to setup gpos, %d\n", ret);
+ return ret;
+ }
+
+ ret = gpiochip_add(&tps65218_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, tps65218_gpio);
+
+ return ret;
+}
+
+static int tps65218_gpio_remove(struct platform_device *pdev)
+{
+ struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&tps65218_gpio->gpio_chip);
+
+ return 0;
+}
+
+static const struct of_device_id tps65218_dt_match[] = {
+ { .compatible = "ti,tps65218-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tps65218_dt_match);
+
+static struct platform_driver tps65218_gpio_driver = {
+ .driver = {
+ .name = "tps65218-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(tps65218_dt_match)
+ },
+ .probe = tps65218_gpio_probe,
+ .remove = tps65218_gpio_remove,
+};
+
+module_platform_driver(tps65218_gpio_driver);
+
+MODULE_ALIAS("platform:tps65218-gpio");
+MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassae...@gmail.com>");
+MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
+MODULE_LICENSE("GPL v2");
--
2.5.0
--
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