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Subject[PATCH 1/2] leds: lp55xx: handle enable pin in driver
Date
This patch moves the handling of the chip's enable pin from the board
code into the driver. It also updates all board-code files using the
driver to incorporate this change.

This is needed for device tree support of the enable pin.

Signed-off-by: Sebastian Reichel <sre@debian.org>
---
.../devicetree/bindings/leds/leds-lp55xx.txt | 1 +
arch/arm/mach-omap2/board-rx51-peripherals.c | 20 +----------------
arch/arm/mach-ux500/board-mop500.c | 2 ++
drivers/leds/leds-lp55xx-common.c | 25 +++++++++++-----------
include/linux/platform_data/leds-lp55xx.h | 6 ++----
5 files changed, 19 insertions(+), 35 deletions(-)
diff --git a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
index a61727f..5fb7b21 100644
--- a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
+++ b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
@@ -10,6 +10,7 @@ Each child has own specific current settings
- max-cur: Maximun current at each led channel.

Optional properties:
+- enable-gpio: GPIO attached to the chip's enable pin
- label: Used for naming LEDs
- pwr-sel: LP8501 specific property. Power selection for output channels.
0: D1~9 are connected to VDD
diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c b/arch/arm/mach-omap2/board-rx51-peripherals.c
index f6fe388..68dc998 100644
--- a/arch/arm/mach-omap2/board-rx51-peripherals.c
+++ b/arch/arm/mach-omap2/board-rx51-peripherals.c
@@ -211,29 +211,11 @@ static struct lp55xx_led_config rx51_lp5523_led_config[] = {
}
};

-static int rx51_lp5523_setup(void)
-{
- return gpio_request_one(RX51_LP5523_CHIP_EN_GPIO, GPIOF_DIR_OUT,
- "lp5523_enable");
-}
-
-static void rx51_lp5523_release(void)
-{
- gpio_free(RX51_LP5523_CHIP_EN_GPIO);
-}
-
-static void rx51_lp5523_enable(bool state)
-{
- gpio_set_value(RX51_LP5523_CHIP_EN_GPIO, !!state);
-}
-
static struct lp55xx_platform_data rx51_lp5523_platform_data = {
.led_config = rx51_lp5523_led_config,
.num_channels = ARRAY_SIZE(rx51_lp5523_led_config),
.clock_mode = LP55XX_CLOCK_AUTO,
- .setup_resources = rx51_lp5523_setup,
- .release_resources = rx51_lp5523_release,
- .enable = rx51_lp5523_enable,
+ .enable_gpio = RX51_LP5523_CHIP_EN_GPIO,
};
#endif

diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c
index ad0806e..703dec2 100644
--- a/arch/arm/mach-ux500/board-mop500.c
+++ b/arch/arm/mach-ux500/board-mop500.c
@@ -297,6 +297,7 @@ static struct lp55xx_platform_data __initdata lp5521_pri_data = {
.led_config = &lp5521_pri_led[0],
.num_channels = 3,
.clock_mode = LP55XX_CLOCK_EXT,
+ .enable_gpio = -1,
};

static struct lp55xx_led_config lp5521_sec_led[] = {
@@ -322,6 +323,7 @@ static struct lp55xx_platform_data __initdata lp5521_sec_data = {
.led_config = &lp5521_sec_led[0],
.num_channels = 3,
.clock_mode = LP55XX_CLOCK_EXT,
+ .enable_gpio = -1,
};

/* I2C0 devices only available on the first HREF/MOP500 */
diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index 351825b..5160f8e 100644
--- a/drivers/leds/leds-lp55xx-common.c
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -20,6 +20,8 @@
#include <linux/module.h>
#include <linux/platform_data/leds-lp55xx.h>
#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>

#include "leds-lp55xx-common.h"

@@ -406,18 +408,18 @@ int lp55xx_init_device(struct lp55xx_chip *chip)
if (!pdata || !cfg)
return -EINVAL;

- if (pdata->setup_resources) {
- ret = pdata->setup_resources();
+ if (gpio_is_valid(pdata->enable_gpio)) {
+ ret = devm_gpio_request_one(dev, pdata->enable_gpio,
+ GPIOF_DIR_OUT, "lp5523_enable");
if (ret < 0) {
- dev_err(dev, "setup resoure err: %d\n", ret);
+ dev_err(dev, "could not acquire enable gpio (err=%d)\n",
+ ret);
goto err;
}
- }

- if (pdata->enable) {
- pdata->enable(0);
+ gpio_set_value(pdata->enable_gpio, 0);
usleep_range(1000, 2000); /* Keep enable down at least 1ms */
- pdata->enable(1);
+ gpio_set_value(pdata->enable_gpio, 1);
usleep_range(1000, 2000); /* 500us abs min. */
}

@@ -458,11 +460,8 @@ void lp55xx_deinit_device(struct lp55xx_chip *chip)
if (chip->clk)
clk_disable_unprepare(chip->clk);

- if (pdata->enable)
- pdata->enable(0);
-
- if (pdata->release_resources)
- pdata->release_resources();
+ if (gpio_is_valid(pdata->enable_gpio))
+ gpio_set_value(pdata->enable_gpio, 0);
}
EXPORT_SYMBOL_GPL(lp55xx_deinit_device);

@@ -593,6 +592,8 @@ int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
of_property_read_string(np, "label", &pdata->label);
of_property_read_u8(np, "clock-mode", &pdata->clock_mode);

+ pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+
/* LP8501 specific */
of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);

diff --git a/include/linux/platform_data/leds-lp55xx.h b/include/linux/platform_data/leds-lp55xx.h
index 51a2ff5..820a5c7 100644
--- a/include/linux/platform_data/leds-lp55xx.h
+++ b/include/linux/platform_data/leds-lp55xx.h
@@ -66,10 +66,8 @@ struct lp55xx_platform_data {
/* Clock configuration */
u8 clock_mode;

- /* Platform specific functions */
- int (*setup_resources)(void);
- void (*release_resources)(void);
- void (*enable)(bool state);
+ /* optional enable GPIO */
+ int enable_gpio;

/* Predefined pattern data */
struct lp55xx_predef_pattern *patterns;
--
1.8.4.rc3


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