LED updates for 5.18-rc1. Nothing major here, there are two drivers

that need review and did not make it.
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Merge tag 'leds-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds

Pull LED updates from Pavel Machek:
 "Nothing major here, there are two drivers that need review and did not
  make it into this round"

* tag 'leds-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds:
  leds: pca955x: Allow zero LEDs to be specified
  leds: pca955x: Make the gpiochip always expose all pins
  leds: simatic-ipc-leds: Don't directly deref ioremap_resource() returned ptr
  leds: simatic-ipc-leds: Make simatic_ipc_led_mem_res static
  leds: lm3692x: Return 0 from remove callback
  leds: sgm3140: Add ocs,ocp8110 compatible
  dt-bindings: vendor-prefixes: Add ocs prefix
  dt-bindings: leds: common: fix unit address in max77693 example

Documentation/devicetree/bindings/leds/common.yaml

@@ -185,9 +185,11 @@ examples:
         };
     };
 
-    led-controller@0 {
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    led-controller {
         compatible = "maxim,max77693-led";
-        reg = <0 0x100>;
 
         led {
             function = LED_FUNCTION_FLASH;
@@ -199,6 +201,9 @@ examples:
         };
     };
 
+  - |
+    #include <dt-bindings/leds/common.h>
+
     i2c {
         #address-cells = <1>;
         #size-cells = <0>;

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -876,6 +876,8 @@ patternProperties:
     description: NXP Semiconductors
   "^oceanic,.*":
     description: Oceanic Systems (UK) Ltd.
+  "^ocs,.*":
+    description: Orient Chip Technology Co., Ltd.
   "^oct,.*":
     description: Octavo Systems LLC
   "^okaya,.*":

drivers/leds/flash/leds-sgm3140.c

@@ -290,6 +290,7 @@ static int sgm3140_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id sgm3140_dt_match[] = {
+	{ .compatible = "ocs,ocp8110" },
 	{ .compatible = "sgmicro,sgm3140" },
 	{ /* sentinel */ }
 };

drivers/leds/leds-lm3692x.c

@@ -494,11 +494,8 @@ static int lm3692x_probe(struct i2c_client *client,
 static int lm3692x_remove(struct i2c_client *client)
 {
 	struct lm3692x_led *led = i2c_get_clientdata(client);
-	int ret;
 
-	ret = lm3692x_leds_disable(led);
-	if (ret)
-		return ret;
+	lm3692x_leds_disable(led);
 	mutex_destroy(&led->lock);
 
 	return 0;

drivers/leds/leds-pca955x.c

@@ -37,6 +37,7 @@
  *  bits the chip supports.
  */
 
+#include <linux/bitops.h>
 #include <linux/ctype.h>
 #include <linux/delay.h>
 #include <linux/err.h>
@@ -118,6 +119,7 @@ struct pca955x {
 	struct pca955x_led *leds;
 	struct pca955x_chipdef	*chipdef;
 	struct i2c_client	*client;
+	unsigned long active_pins;
 #ifdef CONFIG_LEDS_PCA955X_GPIO
 	struct gpio_chip gpio;
 #endif
@@ -360,12 +362,15 @@ static int pca955x_read_input(struct i2c_client *client, int n, u8 *val)
 static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset)
 {
 	struct pca955x *pca955x = gpiochip_get_data(gc);
-	struct pca955x_led *led = &pca955x->leds[offset];
 
-	if (led->type == PCA955X_TYPE_GPIO)
-		return 0;
+	return test_and_set_bit(offset, &pca955x->active_pins) ? -EBUSY : 0;
+}
 
-	return -EBUSY;
+static void pca955x_gpio_free_pin(struct gpio_chip *gc, unsigned int offset)
+{
+	struct pca955x *pca955x = gpiochip_get_data(gc);
+
+	clear_bit(offset, &pca955x->active_pins);
 }
 
 static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset,
@@ -424,7 +429,7 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 	int count;
 
 	count = device_get_child_node_count(&client->dev);
-	if (!count || count > chip->bits)
+	if (count > chip->bits)
 		return ERR_PTR(-ENODEV);
 
 	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
@@ -489,7 +494,6 @@ static int pca955x_probe(struct i2c_client *client)
 	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];
@@ -567,9 +571,7 @@ static int pca955x_probe(struct i2c_client *client)
 
 		switch (pca955x_led->type) {
 		case PCA955X_TYPE_NONE:
-			break;
 		case PCA955X_TYPE_GPIO:
-			ngpios++;
 			break;
 		case PCA955X_TYPE_LED:
 			led = &pca955x_led->led_cdev;
@@ -613,6 +615,8 @@ static int pca955x_probe(struct i2c_client *client)
 			if (err)
 				return err;
 
+			set_bit(i, &pca955x->active_pins);
+
 			/*
 			 * For default-state == "keep", let the core update the
 			 * brightness from the hardware, then check the
@@ -650,31 +654,30 @@ static int pca955x_probe(struct i2c_client *client)
 		return err;
 
 #ifdef CONFIG_LEDS_PCA955X_GPIO
-	if (ngpios) {
-		pca955x->gpio.label = "gpio-pca955x";
-		pca955x->gpio.direction_input = pca955x_gpio_direction_input;
-		pca955x->gpio.direction_output = pca955x_gpio_direction_output;
-		pca955x->gpio.set = pca955x_gpio_set_value;
-		pca955x->gpio.get = pca955x_gpio_get_value;
-		pca955x->gpio.request = pca955x_gpio_request_pin;
-		pca955x->gpio.can_sleep = 1;
-		pca955x->gpio.base = -1;
-		pca955x->gpio.ngpio = ngpios;
-		pca955x->gpio.parent = &client->dev;
-		pca955x->gpio.owner = THIS_MODULE;
+	pca955x->gpio.label = "gpio-pca955x";
+	pca955x->gpio.direction_input = pca955x_gpio_direction_input;
+	pca955x->gpio.direction_output = pca955x_gpio_direction_output;
+	pca955x->gpio.set = pca955x_gpio_set_value;
+	pca955x->gpio.get = pca955x_gpio_get_value;
+	pca955x->gpio.request = pca955x_gpio_request_pin;
+	pca955x->gpio.free = pca955x_gpio_free_pin;
+	pca955x->gpio.can_sleep = 1;
+	pca955x->gpio.base = -1;
+	pca955x->gpio.ngpio = chip->bits;
+	pca955x->gpio.parent = &client->dev;
+	pca955x->gpio.owner = THIS_MODULE;
 
-		err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio,
-					     pca955x);
-		if (err) {
-			/* Use data->gpio.dev as a flag for freeing gpiochip */
-			pca955x->gpio.parent = NULL;
-			dev_warn(&client->dev, "could not add gpiochip\n");
-			return err;
-		}
-		dev_info(&client->dev, "gpios %i...%i\n",
-			 pca955x->gpio.base, pca955x->gpio.base +
-			 pca955x->gpio.ngpio - 1);
+	err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio,
+				     pca955x);
+	if (err) {
+		/* Use data->gpio.dev as a flag for freeing gpiochip */
+		pca955x->gpio.parent = NULL;
+		dev_warn(&client->dev, "could not add gpiochip\n");
+		return err;
 	}
+	dev_info(&client->dev, "gpios %i...%i\n",
+		 pca955x->gpio.base, pca955x->gpio.base +
+		 pca955x->gpio.ngpio - 1);
 #endif
 
 	return 0;

drivers/leds/simple/simatic-ipc-leds.c

@@ -39,9 +39,9 @@ static struct simatic_ipc_led simatic_ipc_leds_io[] = {
 };
 
 /* the actual start will be discovered with PCI, 0 is a placeholder */
-struct resource simatic_ipc_led_mem_res = DEFINE_RES_MEM_NAMED(0, SZ_4K, KBUILD_MODNAME);
+static struct resource simatic_ipc_led_mem_res = DEFINE_RES_MEM_NAMED(0, SZ_4K, KBUILD_MODNAME);
 
-static void *simatic_ipc_led_memory;
+static void __iomem *simatic_ipc_led_memory;
 
 static struct simatic_ipc_led simatic_ipc_leds_mem[] = {
 	{0x500 + 0x1A0, "red:" LED_FUNCTION_STATUS "-1"},
@@ -92,21 +92,22 @@ static void simatic_ipc_led_set_mem(struct led_classdev *led_cd,
 				    enum led_brightness brightness)
 {
 	struct simatic_ipc_led *led = cdev_to_led(led_cd);
+	void __iomem *reg = simatic_ipc_led_memory + led->value;
+	u32 val;
 
-	u32 *p;
-
-	p = simatic_ipc_led_memory + led->value;
-	*p = (*p & ~1) | (brightness == LED_OFF);
+	val = readl(reg);
+	val = (val & ~1) | (brightness == LED_OFF);
+	writel(val, reg);
 }
 
 static enum led_brightness simatic_ipc_led_get_mem(struct led_classdev *led_cd)
 {
 	struct simatic_ipc_led *led = cdev_to_led(led_cd);
+	void __iomem *reg = simatic_ipc_led_memory + led->value;
+	u32 val;
 
-	u32 *p;
-
-	p = simatic_ipc_led_memory + led->value;
-	return (*p & 1) ? LED_OFF : led_cd->max_brightness;
+	val = readl(reg);
+	return (val & 1) ? LED_OFF : led_cd->max_brightness;
 }
 
 static int simatic_ipc_leds_probe(struct platform_device *pdev)
@@ -116,8 +117,9 @@ static int simatic_ipc_leds_probe(struct platform_device *pdev)
 	struct simatic_ipc_led *ipcled;
 	struct led_classdev *cdev;
 	struct resource *res;
+	void __iomem *reg;
 	int err, type;
-	u32 *p;
+	u32 val;
 
 	switch (plat->devmode) {
 	case SIMATIC_IPC_DEVICE_227D:
@@ -157,11 +159,13 @@ static int simatic_ipc_leds_probe(struct platform_device *pdev)
 			return PTR_ERR(simatic_ipc_led_memory);
 
 		/* initialize power/watchdog LED */
-		p = simatic_ipc_led_memory + 0x500 + 0x1D8; /* PM_WDT_OUT */
-		*p = (*p & ~1);
-		p = simatic_ipc_led_memory + 0x500 + 0x1C0; /* PM_BIOS_BOOT_N */
-		*p = (*p | 1);
+		reg = simatic_ipc_led_memory + 0x500 + 0x1D8; /* PM_WDT_OUT */
+		val = readl(reg);
+		writel(val & ~1, reg);
 
+		reg = simatic_ipc_led_memory + 0x500 + 0x1C0; /* PM_BIOS_BOOT_N */
+		val = readl(reg);
+		writel(val | 1, reg);
 		break;
 	default:
 		return -ENODEV;