mvebu: backport pending Turris Omnia LEDs improvements

It backports this patch series, which is currently on review:
https://lore.kernel.org/linux-leds/20220704105955.15474-1-kabel@kernel.org/T/#rb89a4ca5a836f17bdcc53d65549e0b1779bb6a18
It allows being able to configure LEDs in userspace.

This fixes issue described in Turris Build repository
https://gitlab.nic.cz/turris/os/build/-/issues/354
It happens in OpenWrt as well.

- Before
```
root@turris:/# ls /sys/class/leds/
ath10k-phy0  ath9k-phy1   mmc0::
```

 -After
```
root@turris:/# ls /sys/class/leds/
ath10k-phy0      rgb:indicator-2  rgb:lan-3        rgb:wlan-1
ath9k-phy1       rgb:lan-0        rgb:lan-4        rgb:wlan-2
mmc0::           rgb:lan-1        rgb:power        rgb:wlan-3
rgb:indicator-1  rgb:lan-2        rgb:wan
```

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
(cherry picked from commit 049368b936988ce2c7f82c07367d168600fdbaa6)

1 files changed, 31 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-5.10/104-leds-turris-omnia-change-max-brightness-from-255-to-.patch b/target/linux/mvebu/patches-5.10/104-leds-turris-omnia-change-max-brightness-from-255-to-.patch
new file mode 100644
index 0000000000..da4ad49b23
--- /dev/null
+++ b/target/linux/mvebu/patches-5.10/104-leds-turris-omnia-change-max-brightness-from-255-to-.patch
@@ -0,0 +1,31 @@
+From 349cbe949b9622cc05b148ecfa6268cbbae35b45 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
+Date: Mon, 4 Jul 2022 12:59:55 +0200
+Subject: [PATCH] leds: turris-omnia: change max brightness from 255 to 1
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Using binary brightness makes more sense for this controller, because
+internally in the MCU it works that way: the LED has a color, and a
+state whether it is ON or OFF.
+
+The resulting brightness computation with led_mc_calc_color_components()
+will now always result in either (0, 0, 0) or the multi_intensity value.
+
+Signed-off-by: Marek Behún <kabel@kernel.org>
+---
+ drivers/leds/leds-turris-omnia.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/leds/leds-turris-omnia.c
++++ b/drivers/leds/leds-turris-omnia.c
+@@ -154,7 +154,7 @@ static int omnia_led_register(struct i2c
+ 	init_data.fwnode = &np->fwnode;
+ 
+ 	cdev = &led->mc_cdev.led_cdev;
+-	cdev->max_brightness = 255;
++	cdev->max_brightness = 1;
+ 	cdev->brightness_set_blocking = omnia_led_brightness_set_blocking;
+ 	cdev->trigger_type = &omnia_hw_trigger_type;
+ 	cdev->default_trigger = omnia_hw_trigger.name;