[PATCH 3/3 v6] ARM: davinci: dm646x: Convert LEDs to GPIO descriptor table

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

This converts the DaVinci DM646x LEDs to use GPIO
descriptor look-ups.

Cc: Sekhar Nori <nsekhar@xxxxxx>
Cc: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v5->v6:
- Rebase on v5.14-rc1
ChangeLog v4->v5:
- Name each I2C expander instance explicitly as "u2" etc.
- Tie the LEDs to the generated "i2c-u2" device name.
ChangeLog v3->v4:
- Rebase on v5.13-rc1
- Resend
- LED maintainers: please apply this patch, it is ACKed by a DaVinci
  maintainer
ChangeLog v2->v3:
- Rebase on v5.10-rc1
- Resend
ChangeLog v1->v2:
- Collect Bartosz' review tag
- Rebase on v5.9-rc1
- Resend
---
 arch/arm/mach-davinci/board-dm646x-evm.c | 34 +++++++++++++++++-------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-davinci/board-dm646x-evm.c b/arch/arm/mach-davinci/board-dm646x-evm.c
index ee91d81ebbfd..00c074fddce6 100644
--- a/arch/arm/mach-davinci/board-dm646x-evm.c
+++ b/arch/arm/mach-davinci/board-dm646x-evm.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <linux/leds.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/property.h>
@@ -202,10 +203,10 @@ static struct i2c_driver dm6467evm_cpld_driver = {
 /* LEDS */
 
 static struct gpio_led evm_leds[] = {
-	{ .name = "DS1", .active_low = 1, },
-	{ .name = "DS2", .active_low = 1, },
-	{ .name = "DS3", .active_low = 1, },
-	{ .name = "DS4", .active_low = 1, },
+	{ .name = "DS1" },
+	{ .name = "DS2" },
+	{ .name = "DS3" },
+	{ .name = "DS4" },
 };
 
 static const struct gpio_led_platform_data evm_led_data = {
@@ -213,18 +214,32 @@ static const struct gpio_led_platform_data evm_led_data = {
 	.leds     = evm_leds,
 };
 
+static struct gpiod_lookup_table evm_leds_gpio_table = {
+	.dev_id = "leds-gpio.0",
+	.table = {
+		/*
+		 * These GPIOs are on a PCF8574a GPIO expander, which
+		 * is in turn named after the I2C device name. This is
+		 * device "u2" on I2C bus 1 with address 0x38. These
+		 * leds are at offset 4, 5, 6, 7.
+		 */
+		GPIO_LOOKUP_IDX("i2c-u2", 4, NULL, 0, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("i2c-u2", 5, NULL, 1, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("i2c-u2", 6, NULL, 2, GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("i2c-u2", 7, NULL, 3, GPIO_ACTIVE_LOW),
+		{ },
+	},
+};
+
 static struct platform_device *evm_led_dev;
 
 static int evm_led_setup(struct i2c_client *client, int gpio,
 			unsigned int ngpio, void *c)
 {
-	struct gpio_led *leds = evm_leds;
 	int status;
 
-	while (ngpio--) {
-		leds->gpio = gpio++;
-		leds++;
-	}
+	/* Add the lookup table */
+	gpiod_add_lookup_table(&evm_leds_gpio_table);
 
 	evm_led_dev = platform_device_alloc("leds-gpio", 0);
 	platform_device_add_data(evm_led_dev, &evm_led_data,
@@ -438,6 +453,7 @@ static struct i2c_board_info __initdata i2c_info[] =  {
 	},
 	{
 		I2C_BOARD_INFO("pcf8574a", 0x38),
+		.dev_name = "u2",
 		.platform_data	= &pcf_data,
 	},
 	{
-- 
2.31.1