Re: [PATCH v3 5/5] gpio: tps65912: Add GPIO driver for the TPS65912 PMIC

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On 09/27/2015 09:54 PM, Alexandre Courbot wrote:
On Thu, Sep 24, 2015 at 11:52 PM, Andrew F. Davis <afd@xxxxxx> wrote:
This patch adds support for the TPS65912 PMIC GPIOs.

TPS65912 has five configurable GPIOs that can be used for several
purposes.

Signed-off-by: Andrew F. Davis <afd@xxxxxx>
---
  drivers/gpio/Kconfig         |   6 ++
  drivers/gpio/Makefile        |   1 +
  drivers/gpio/gpio-tps65912.c | 138 +++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 145 insertions(+)
  create mode 100644 drivers/gpio/gpio-tps65912.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index fb28483..82218fa 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -838,6 +838,12 @@ config GPIO_TPS65910
           Select this option to enable GPIO driver for the TPS65910
           chip family.

+config GPIO_TPS65912
+       tristate "TI TPS65912 GPIO"
+       depends on MFD_TPS65912
+       help
+         This driver supports TPS65912 gpio chip
+
  config GPIO_TWL4030
         tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
         depends on TWL4030_CORE
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 605bf89..f79a7c4 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -96,6 +96,7 @@ obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
  obj-$(CONFIG_GPIO_PALMAS)      += gpio-palmas.o
  obj-$(CONFIG_GPIO_TPS6586X)    += gpio-tps6586x.o
  obj-$(CONFIG_GPIO_TPS65910)    += gpio-tps65910.o
+obj-$(CONFIG_GPIO_TPS65912)    += gpio-tps65912.o
  obj-$(CONFIG_GPIO_TS5500)      += gpio-ts5500.o
  obj-$(CONFIG_GPIO_TWL4030)     += gpio-twl4030.o
  obj-$(CONFIG_GPIO_TWL6040)     += gpio-twl6040.o
diff --git a/drivers/gpio/gpio-tps65912.c b/drivers/gpio/gpio-tps65912.c
new file mode 100644
index 0000000..4707e62
--- /dev/null
+++ b/drivers/gpio/gpio-tps65912.c
@@ -0,0 +1,138 @@
+/*
+ * TI TPS65912x GPIO Driver
+ *
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Author: Andrew F. Davis <afd@xxxxxx>
+ *
+ * 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 Arizona GPIO driver and the previous TPS65912 driver by
+ * Margarita Olaya Cabrera <magi@xxxxxxxxxxxxxxx>
+ */
+
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#include <linux/mfd/tps65912.h>
+
+struct tps65912_gpio {
+       struct tps65912 *tps;
+       struct gpio_chip gpio_chip;

Nit: I'd suggest to put gpio_chip as the first member of your struct
so that to_gpio() resolves to the same address. This may make the
generated code neglectably smaller and faster.


ACK

+};
+
+#define to_gpio(gc) container_of(gc, struct tps65912_gpio, gpio_chip)

Nit2: Maybe a more specific name (like tps_gpio()) would be better?
It's local to this file though, so not a big deal.


ACK

+
+static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+       struct tps65912_gpio *gpio = to_gpio(gc);
+       int ret, val;
+
+       ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
+       if (ret < 0)
+               return ret;
+
+       return val & GPIO_STS_MASK;
+}
+
+static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
+                             int value)
+{
+       struct tps65912_gpio *gpio = to_gpio(gc);
+
+       regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
+                          GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
+}
+
+static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
+                               int value)
+{
+       struct tps65912_gpio *gpio = to_gpio(gc);
+
+       /* Set the initial value */
+       tps65912_gpio_set(gc, offset, value);
+
+       return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
+                                 GPIO_CFG_MASK, GPIO_CFG_MASK);
+}
+
+static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+       struct tps65912_gpio *gpio = to_gpio(gc);
+
+       return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
+                                 GPIO_CFG_MASK, 0);
+}
+
+static const struct of_device_id tps65912_gpio_of_match_table[] = {
+       { .compatible = "ti,tps65912-gpio", },
+       { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, tps65912_gpio_of_match_table);
+
+static struct gpio_chip template_chip = {
+       .label                  = "tps65912-gpio",
+       .owner                  = THIS_MODULE,
+       .direction_input        = tps65912_gpio_input,
+       .direction_output       = tps65912_gpio_output,
+       .get                    = tps65912_gpio_get,
+       .set                    = tps65912_gpio_set,
+       .can_sleep              = true,
+       .ngpio                  = 5,
+       .base                   = -1,
+};
+
+static int tps65912_gpio_probe(struct platform_device *pdev)
+{
+       struct tps65912_gpio *gpio;
+       int ret;
+
+       gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+       if (!gpio)
+               return -ENOMEM;
+
+       gpio->tps = dev_get_drvdata(pdev->dev.parent);
+       gpio->gpio_chip = template_chip;
+       ret = gpiochip_add(&gpio->gpio_chip);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+               return ret;
+       }
+
+       platform_set_drvdata(pdev, gpio);
+
+       return 0;
+}
+
+static int tps65912_gpio_remove(struct platform_device *pdev)
+{
+       struct tps65912_gpio *gpio = platform_get_drvdata(pdev);
+
+       gpiochip_remove(&gpio->gpio_chip);
+
+       return 0;
+}
+
+static struct platform_driver tps65912_gpio_driver = {
+       .driver = {
+               .name = "tps65912-gpio",
+               .of_match_table = tps65912_gpio_of_match_table,
+       },
+       .probe = tps65912_gpio_probe,
+       .remove = tps65912_gpio_remove,
+};
+
+module_platform_driver(tps65912_gpio_driver);
+
+MODULE_AUTHOR("Andrew F. Davis <afd@xxxxxx>");
+MODULE_DESCRIPTION("TPS65912 GPIO driver");
+MODULE_ALIAS("platform:tps65912-gpio");
+MODULE_LICENSE("GPL v2");

Nice and simple driver - my remarks above should not be taken as a
call to re-spin, just consider them if you need to send another
version of this patchset.

Reviewed-by: Alexandre Courbot <acourbot@xxxxxxxxxx>


I'm going to have to send another spin of this patchset anyway so I'll
take them.

Thanks for the review,
Andrew
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