kernel: add upstream patches for pca955x led driver

These patches are to support the pca955x led with OpenWRT correctly via
device tree on linux 5.10. Without these, the new LED function/color/reg
features can not be used.

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.10/843-v5.15-leds-pca955x-let-the-core-process-the-fwnode.patch b/target/linux/generic/backport-5.10/843-v5.15-leds-pca955x-let-the-core-process-the-fwnode.patch
new file mode 100644
index 0000000000..7a091d9716
--- /dev/null
+++ b/target/linux/generic/backport-5.10/843-v5.15-leds-pca955x-let-the-core-process-the-fwnode.patch
@@ -0,0 +1,138 @@
+From 7c4815929276b2e223eb6f2e49afe5071d4294a5 Mon Sep 17 00:00:00 2001
+From: Eddie James <eajames@linux.ibm.com>
+Date: Fri, 16 Jul 2021 17:03:30 -0500
+Subject: [PATCH] leds: pca955x: Let the core process the fwnode
+
+Much of the fwnode processing in the PCA955x driver is now in the
+LEDs core driver, so pass the fwnode in the init data when
+registering the LED device. In order to preserve the existing naming
+scheme, check for an empty name and set it to the LED number.
+
+Signed-off-by: Eddie James <eajames@linux.ibm.com>
+Signed-off-by: Pavel Machek <pavel@ucw.cz>
+---
+ drivers/leds/leds-pca955x.c | 58 +++++++++++++++++++------------------
+ 1 file changed, 30 insertions(+), 28 deletions(-)
+
+diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
+index fa1d77d86ef67b..a6aa4b9abde8c4 100644
+--- a/drivers/leds/leds-pca955x.c
++++ b/drivers/leds/leds-pca955x.c
+@@ -127,10 +127,9 @@ struct pca955x_led {
+ 	struct pca955x	*pca955x;
+ 	struct led_classdev	led_cdev;
+ 	int			led_num;	/* 0 .. 15 potentially */
+-	char			name[32];
+ 	u32			type;
+ 	int			default_state;
+-	const char		*default_trigger;
++	struct fwnode_handle	*fwnode;
+ };
+ 
+ struct pca955x_platform_data {
+@@ -439,7 +438,6 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
+ 		return ERR_PTR(-ENOMEM);
+ 
+ 	device_for_each_child_node(&client->dev, child) {
+-		const char *name;
+ 		const char *state;
+ 		u32 reg;
+ 		int res;
+@@ -448,17 +446,10 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
+ 		if ((res != 0) || (reg >= chip->bits))
+ 			continue;
+ 
+-		res = fwnode_property_read_string(child, "label", &name);
+-		if ((res != 0) && is_of_node(child))
+-			name = to_of_node(child)->name;
+-
+ 		led = &pdata->leds[reg];
+-		snprintf(led->name, sizeof(led->name), "%s", name);
+-
+ 		led->type = PCA955X_TYPE_LED;
++		led->fwnode = child;
+ 		fwnode_property_read_u32(child, "type", &led->type);
+-		fwnode_property_read_string(child, "linux,default-trigger",
+-					    &led->default_trigger);
+ 
+ 		if (!fwnode_property_read_string(child, "default-state",
+ 						 &state)) {
+@@ -495,11 +486,14 @@ static int pca955x_probe(struct i2c_client *client,
+ 	struct pca955x_led *pca955x_led;
+ 	struct pca955x_chipdef *chip;
+ 	struct led_classdev *led;
++	struct led_init_data init_data;
+ 	struct i2c_adapter *adapter;
+ 	int i, err;
+ 	struct pca955x_platform_data *pdata;
+ 	int ngpios = 0;
++	bool set_default_label = false;
+ 	bool keep_pwm = false;
++	char default_label[8];
+ 
+ 	chip = &pca955x_chipdefs[id->driver_data];
+ 	adapter = client->adapter;
+@@ -547,6 +541,9 @@ static int pca955x_probe(struct i2c_client *client,
+ 	pca955x->client = client;
+ 	pca955x->chipdef = chip;
+ 
++	init_data.devname_mandatory = false;
++	init_data.devicename = "pca955x";
++
+ 	for (i = 0; i < chip->bits; i++) {
+ 		pca955x_led = &pca955x->leds[i];
+ 		pca955x_led->led_num = i;
+@@ -560,23 +557,7 @@ static int pca955x_probe(struct i2c_client *client,
+ 			ngpios++;
+ 			break;
+ 		case PCA955X_TYPE_LED:
+-			/*
+-			 * Platform data can specify LED names and
+-			 * default triggers
+-			 */
+-			if (pdata->leds[i].name[0] == '\0')
+-				snprintf(pdata->leds[i].name,
+-					 sizeof(pdata->leds[i].name), "%d", i);
+-
+-			snprintf(pca955x_led->name, sizeof(pca955x_led->name),
+-				 "pca955x:%s", pdata->leds[i].name);
+-
+ 			led = &pca955x_led->led_cdev;
+-			if (pdata->leds[i].default_trigger)
+-				led->default_trigger =
+-					pdata->leds[i].default_trigger;
+-
+-			led->name = pca955x_led->name;
+ 			led->brightness_set_blocking = pca955x_led_set;
+ 			led->brightness_get = pca955x_led_get;
+ 
+@@ -592,7 +573,28 @@ static int pca955x_probe(struct i2c_client *client,
+ 					return err;
+ 			}
+ 
+-			err = devm_led_classdev_register(&client->dev, led);
++			init_data.fwnode = pdata->leds[i].fwnode;
++
++			if (is_of_node(init_data.fwnode)) {
++				if (to_of_node(init_data.fwnode)->name[0] ==
++				    '\0')
++					set_default_label = true;
++				else
++					set_default_label = false;
++			} else {
++				set_default_label = true;
++			}
++
++			if (set_default_label) {
++				snprintf(default_label, sizeof(default_label),
++					 "%d", i);
++				init_data.default_label = default_label;
++			} else {
++				init_data.default_label = NULL;
++			}
++
++			err = devm_led_classdev_register_ext(&client->dev, led,
++							     &init_data);
+ 			if (err)
+ 				return err;
+