[PATCH v2 0/3] Add support for the TLC5925

[PATCH v2 0/3] Add support for the TLC5925

[Jean-Jacques Hiblot]

This series add the support for the TLC5925 LED controller.
This LED controller is driven though SPI. There is little internal logic
and it can be thought of as a deserializer + latches.
The TLC5925 itself drives up to 16 LEDs, but multiple TLC5925s can be
chained to drive more.

The first patch describes the dt bindings.
The second patch implements most of the driver and supports only
synchronous brightness setting (brightness_set_blocking).
The last patch implements the non-blocking version (brightness_set).

changes v1->v2:
 * renamed property shift_register_length into shift-register-length
 * add a SPI MODULE_DEVICE_TABLE structure
 * fixed the yaml description of the bindings (now passes dt_binding_check)

Jean-Jacques Hiblot (3):
  dt-bindings: leds: Add bindings for the TLC5925 controller
  leds: Add driver for the TLC5925 LED controller
  leds: tlc5925: Add support for non blocking operations

 .../devicetree/bindings/leds/ti,tlc5925.yaml  | 106 +++++++++
 drivers/leds/Kconfig                          |   6 +
 drivers/leds/Makefile                         |   1 +
 drivers/leds/leds-tlc5925.c                   | 223 ++++++++++++++++++
 4 files changed, 336 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
 create mode 100644 drivers/leds/leds-tlc5925.c

-- 
2.25.1

[PATCH v2 1/3] dt-bindings: leds: Add bindings for the TLC5925 controller

[Jean-Jacques Hiblot]

Add bindings documentation for the TLC5925 LED controller.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
---
 .../devicetree/bindings/leds/ti,tlc5925.yaml  | 106 ++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml

diff --git a/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
new file mode 100644
index 000000000000..379ade094fd3
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/ti,tlc5925.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LEDs connected to TI TLC5925 controller
+
+maintainers:
+  - Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+
+description: |
+  The TLC5925 is a low-power 16-channel constant-current LED sink driver.
+  It is controlled through a SPI interface.
+  It is built around a shift register and latches which convert serial
+  input data into a parallel output. Several TLC5925 can be chained to
+  control more than 16 LEDs with a single chip-select.
+  The brightness level cannot be controlled, each LED is either on or off.
+
+  Each LED is represented as a sub-node of the ti,tlc5925 device.
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    const: ti,tlc5925
+
+  shift-register-length:
+    minimum: 8
+    description: |
+      The length of the shift register. If several TLC5925 are chained,
+      shift_register_length should be set to 16 times the number of TLC5925.
+      The value must be a multiple of 8.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  output-enable-b-gpios:
+    description: |
+      Optional GPIO pins to enable/disable the parallel output. They describe
+      the GPIOs connected to the OE/ pin of the TLC5925s.
+
+patternProperties:
+  "@[0-9a-z]+$":
+    type: object
+    $ref: common.yaml#
+
+    description: |
+      LED pin number (must be lower than shift_register_length).
+      The furthest LED down the chain has the pin number 0.
+
+    properties:
+      reg:
+        minimum: 0
+
+    required:
+      - reg
+
+additionalProperties: true
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - shift_register_length
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        leds@2 {
+            compatible = "ti,tlc5925";
+            reg = <0x02>;
+            spi-max-frequency = <30000000>;
+            shift_register_length = <32>;
+            output-enable-b-gpios = <&gpio0b 9 GPIO_ACTIVE_HIGH>, <&gpio0b 7 GPIO_ACTIVE_HIGH>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            led@0 {
+                reg = <0>;
+                function = LED_FUNCTION_STATUS;
+                color = <LED_COLOR_ID_GREEN>;
+            };
+
+            led@4 {
+                reg = <4>;
+                function = LED_FUNCTION_STATUS;
+                color = <LED_COLOR_ID_RED>;
+            };
+
+            led@1f {
+                reg = <31>;
+                function = LED_FUNCTION_PANIC;
+                color = <LED_COLOR_ID_RED>;
+            };
+        };
+
+    };
-- 
2.25.1

[PATCH v2 2/3] leds: Add driver for the TLC5925 LED controller

[Jean-Jacques Hiblot]

The TLC5925 is a 16-channels constant-current LED sink driver.
It is controlled via SPI but doesn't offer a register-based interface.
Instead it contains a shift register and latches that convert the
serial input into a parallel output.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
---
 drivers/leds/Kconfig        |   6 ++
 drivers/leds/Makefile       |   1 +
 drivers/leds/leds-tlc5925.c | 163 ++++++++++++++++++++++++++++++++++++
 3 files changed, 170 insertions(+)
 create mode 100644 drivers/leds/leds-tlc5925.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index a49979f41eee..b17eb01210ba 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -658,6 +658,12 @@ config LEDS_TLC591XX
 	  This option enables support for Texas Instruments TLC59108
 	  and TLC59116 LED controllers.
 
+config LEDS_TLC5925
+	tristate "LED driver for TLC5925 controller"
+	depends on LEDS_CLASS && SPI
+	help
+	  This option enables support for Texas Instruments TLC5925.
+
 config LEDS_MAX77650
 	tristate "LED support for Maxim MAX77650 PMIC"
 	depends on LEDS_CLASS && MFD_MAX77650
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 4fd2f92cd198..9d15b88d482f 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_LEDS_SYSCON)		+= leds-syscon.o
 obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o
 obj-$(CONFIG_LEDS_TI_LMU_COMMON)	+= leds-ti-lmu-common.o
 obj-$(CONFIG_LEDS_TLC591XX)		+= leds-tlc591xx.o
+obj-$(CONFIG_LEDS_TLC5925)		+= leds-tlc5925.o
 obj-$(CONFIG_LEDS_TPS6105X)		+= leds-tps6105x.o
 obj-$(CONFIG_LEDS_TURRIS_OMNIA)		+= leds-turris-omnia.o
 obj-$(CONFIG_LEDS_WM831X_STATUS)	+= leds-wm831x-status.o
diff --git a/drivers/leds/leds-tlc5925.c b/drivers/leds/leds-tlc5925.c
new file mode 100644
index 000000000000..8ce3362b4190
--- /dev/null
+++ b/drivers/leds/leds-tlc5925.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * The driver supports controllers with a very simple SPI protocol:
+ * - the data is deserialized in a shift-register when CS is asserted
+ * - the data is latched when CS is de-asserted
+ * - the LED are either on or off (no control of the brightness)
+ *
+ * Supported devices:
+ * - "ti,tlc5925":  Low-Power 16-Channel Constant-Current LED Sink Driver
+ *                  https://www.ti.com/lit/ds/symlink/tlc5925.pdf
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/spi/spi.h>
+#include <linux/property.h>
+#include <linux/workqueue.h>
+
+struct single_led_priv {
+	int idx;
+	struct led_classdev cdev;
+};
+
+struct tlc5925_leds_priv {
+	int max_num_leds;
+	u8 *state;
+	spinlock_t lock;
+	struct single_led_priv leds[];
+};
+
+static int tlc5925_brightness_set_blocking(struct led_classdev *cdev,
+					    enum led_brightness brightness)
+{
+	struct spi_device *spi = to_spi_device(cdev->dev->parent);
+	struct tlc5925_leds_priv *priv = spi_get_drvdata(spi);
+	struct single_led_priv *led = container_of(cdev,
+						   struct single_led_priv,
+						   cdev);
+	int index = led->idx;
+
+	spin_lock(&priv->lock);
+	if (brightness)
+		priv->state[index / 8] |= (1 << (index % 8));
+	else
+		priv->state[index / 8] &= ~(1 << (index % 8));
+	spin_unlock(&priv->lock);
+
+	return spi_write(spi, priv->state, priv->max_num_leds / 8);
+}
+
+
+static int tlc5925_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct fwnode_handle *child;
+	struct tlc5925_leds_priv *priv;
+	int ret;
+	int max_num_leds, count;
+	struct gpio_descs *gpios;
+
+	count = device_get_child_node_count(dev);
+	if (!count) {
+		dev_err(dev, "no led defined.\n");
+		return -ENODEV;
+	}
+
+	ret = device_property_read_u32_array(dev, "shift-register-length",
+					     &max_num_leds, 1);
+	if (ret) {
+		dev_err(dev, "'shift-register-length' property is required.\n");
+		return -EINVAL;
+	}
+
+	if (max_num_leds % 8) {
+		dev_err(dev, "'shift-register-length' must be a multiple of 8\n");
+		return -EINVAL;
+	}
+
+	if (max_num_leds == 0) {
+		dev_err(dev, "'shift-register-length' must be greater than 0\n");
+		return -EINVAL;
+	}
+
+	/* Assert all the OE/ lines */
+	gpios = devm_gpiod_get_array(dev, "output-enable-b", GPIOD_OUT_LOW);
+	if (IS_ERR(gpios)) {
+		dev_err(dev, "Unable to get the 'output-enable-b' gpios\n");
+		return PTR_ERR(gpios);
+	}
+
+	priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	spin_lock_init(&priv->lock);
+
+	priv->state = devm_kzalloc(dev, DIV_ROUND_UP(max_num_leds, 8), GFP_KERNEL);
+	if (!priv->state)
+		return -ENOMEM;
+
+	priv->max_num_leds = max_num_leds;
+
+	device_for_each_child_node(dev, child) {
+		struct led_init_data init_data = {.fwnode = child};
+		struct led_classdev *cdev;
+		u32 idx;
+
+		ret = fwnode_property_read_u32_array(child, "reg", &idx, 1);
+		if (ret || idx >= max_num_leds) {
+			dev_err(dev, "%s: invalid reg value. Ignoring.\n",
+				fwnode_get_name(child));
+			fwnode_handle_put(child);
+			continue;
+		}
+
+		count--;
+		priv->leds[count].idx = idx;
+		cdev = &(priv->leds[count].cdev);
+		cdev->brightness = LED_OFF;
+		cdev->max_brightness = 1;
+		cdev->brightness_set_blocking = tlc5925_brightness_set_blocking;
+
+		ret = devm_led_classdev_register_ext(dev, cdev, &init_data);
+		if (ret) {
+			dev_err(dev, "%s: cannot create LED device.\n",
+				fwnode_get_name(child));
+			fwnode_handle_put(child);
+			continue;
+		}
+	}
+
+	spi_set_drvdata(spi, priv);
+
+	return 0;
+}
+
+static const struct of_device_id tlc5925_dt_ids[] = {
+	{ .compatible = "ti,tlc5925", },
+	{},
+};
+
+static const struct spi_device_id tlc5925_id[] = {
+	{"tlc5925", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, tlc5925_id);
+
+static struct spi_driver tlc5925_driver = {
+	.probe = tlc5925_probe,
+	.driver = {
+		.name		= KBUILD_MODNAME,
+		.of_match_table	= tlc5925_dt_ids,
+	},
+};
+
+module_spi_driver(tlc5925_driver);
+
+MODULE_AUTHOR("Jean-Jacques Hiblot <jjhiblot@traphandler.com>");
+MODULE_DESCRIPTION("TLC5925 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:tlc5925");
-- 
2.25.1

[PATCH v2 3/3] leds: tlc5925: Add support for non blocking operations

[Jean-Jacques Hiblot]

Settings multiple LEDs in a row can be a slow operation because of the
time required to acquire the bus and prepare the transfer.
And, in most cases, it is not required that the operation is synchronous.

Implementing the non-blocking brightness_set() for such cases.
A work queue is used to perform the actual SPI transfer.

The blocking method is still available in case someone needs to perform
this operation synchronously (ie by calling led_set_brightness_sync()).


Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
---
 drivers/leds/leds-tlc5925.c | 76 +++++++++++++++++++++++++++++++++----
 1 file changed, 68 insertions(+), 8 deletions(-)

diff --git a/drivers/leds/leds-tlc5925.c b/drivers/leds/leds-tlc5925.c
index 8ce3362b4190..f2ed87cb6858 100644
--- a/drivers/leds/leds-tlc5925.c
+++ b/drivers/leds/leds-tlc5925.c
@@ -18,6 +18,8 @@
 #include <linux/property.h>
 #include <linux/workqueue.h>
 
+#define BITS_PER_ATOMIC (sizeof(atomic_t) * 8)
+
 struct single_led_priv {
 	int idx;
 	struct led_classdev cdev;
@@ -25,12 +27,35 @@ struct single_led_priv {
 
 struct tlc5925_leds_priv {
 	int max_num_leds;
-	u8 *state;
+	int max_state;
+	atomic_t *state;
+	int *spi_buffer;
 	spinlock_t lock;
+	struct spi_device *spi;
+	struct work_struct xmit_work;
 	struct single_led_priv leds[];
 };
 
-static int tlc5925_brightness_set_blocking(struct led_classdev *cdev,
+static int xmit(struct tlc5925_leds_priv *priv)
+{
+	int i;
+
+	spin_lock(&priv->lock);
+	for (i = 0; i < priv->max_state / (sizeof(atomic_t) * 8) ; i++)
+		priv->spi_buffer[i] = atomic_read(&priv->state[i]);
+	spin_unlock(&priv->lock);
+
+	return spi_write(priv->spi, priv->spi_buffer, priv->max_num_leds / 8);
+}
+
+static void xmit_work(struct work_struct *ws)
+{
+	struct tlc5925_leds_priv *priv =
+		container_of(ws, struct tlc5925_leds_priv, xmit_work);
+	xmit(priv);
+};
+
+static void tlc5925_brightness_set(struct led_classdev *cdev,
 					    enum led_brightness brightness)
 {
 	struct spi_device *spi = to_spi_device(cdev->dev->parent);
@@ -40,16 +65,36 @@ static int tlc5925_brightness_set_blocking(struct led_classdev *cdev,
 						   cdev);
 	int index = led->idx;
 
-	spin_lock(&priv->lock);
 	if (brightness)
-		priv->state[index / 8] |= (1 << (index % 8));
+		atomic_or(1 << (index % BITS_PER_ATOMIC),
+			  &priv->state[index / BITS_PER_ATOMIC]);
 	else
-		priv->state[index / 8] &= ~(1 << (index % 8));
-	spin_unlock(&priv->lock);
+		atomic_and(~(1 << (index % BITS_PER_ATOMIC)),
+			   &priv->state[index / BITS_PER_ATOMIC]);
 
-	return spi_write(spi, priv->state, priv->max_num_leds / 8);
+	schedule_work(&priv->xmit_work);
 }
 
+static int tlc5925_brightness_set_blocking(struct led_classdev *cdev,
+					    enum led_brightness brightness)
+{
+	struct spi_device *spi = to_spi_device(cdev->dev->parent);
+	struct tlc5925_leds_priv *priv = spi_get_drvdata(spi);
+	struct single_led_priv *led = container_of(cdev,
+						   struct single_led_priv,
+						   cdev);
+	int index = led->idx;
+
+	if (brightness)
+		atomic_or(1 << (index % BITS_PER_ATOMIC),
+			  &priv->state[index / BITS_PER_ATOMIC]);
+	else
+		atomic_and(~(1 << (index % BITS_PER_ATOMIC)),
+			   &priv->state[index / BITS_PER_ATOMIC]);
+
+	cancel_work_sync(&priv->xmit_work);
+	return xmit(priv);
+}
 
 static int tlc5925_probe(struct spi_device *spi)
 {
@@ -96,10 +141,24 @@ static int tlc5925_probe(struct spi_device *spi)
 
 	spin_lock_init(&priv->lock);
 
-	priv->state = devm_kzalloc(dev, DIV_ROUND_UP(max_num_leds, 8), GFP_KERNEL);
+	priv->spi = spi;
+	INIT_WORK(&priv->xmit_work, xmit_work);
+
+	// Allocate the buffer used to hold the state of each LED
+	priv->max_state = round_up(max_num_leds, BITS_PER_ATOMIC);
+	priv->state = devm_kzalloc(dev,
+				   priv->max_state / 8,
+				   GFP_KERNEL);
 	if (!priv->state)
 		return -ENOMEM;
 
+	// Allocate a second buffer for the communication on the SPI bus
+	priv->spi_buffer = devm_kzalloc(dev,
+				   priv->max_state / 8,
+				   GFP_KERNEL);
+	if (!priv->spi_buffer)
+		return -ENOMEM;
+
 	priv->max_num_leds = max_num_leds;
 
 	device_for_each_child_node(dev, child) {
@@ -120,6 +179,7 @@ static int tlc5925_probe(struct spi_device *spi)
 		cdev = &(priv->leds[count].cdev);
 		cdev->brightness = LED_OFF;
 		cdev->max_brightness = 1;
+		cdev->brightness_set = tlc5925_brightness_set;
 		cdev->brightness_set_blocking = tlc5925_brightness_set_blocking;
 
 		ret = devm_led_classdev_register_ext(dev, cdev, &init_data);
-- 
2.25.1

Re: [PATCH v2 1/3] dt-bindings: leds: Add bindings for the TLC5925 controller

[Rob Herring]

On Fri, Jun 03, 2022 at 05:53:30PM +0200, Jean-Jacques Hiblot wrote:
> Add bindings documentation for the TLC5925 LED controller.
> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
> ---
>  .../devicetree/bindings/leds/ti,tlc5925.yaml  | 106 ++++++++++++++++++
>  1 file changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> new file mode 100644
> index 000000000000..379ade094fd3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/ti,tlc5925.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LEDs connected to TI TLC5925 controller
> +
> +maintainers:
> +  - Jean-Jacques Hiblot <jjhiblot@traphandler.com>
> +
> +description: |
> +  The TLC5925 is a low-power 16-channel constant-current LED sink driver.
> +  It is controlled through a SPI interface.
> +  It is built around a shift register and latches which convert serial
> +  input data into a parallel output. Several TLC5925 can be chained to
> +  control more than 16 LEDs with a single chip-select.
> +  The brightness level cannot be controlled, each LED is either on or off.
> +
> +  Each LED is represented as a sub-node of the ti,tlc5925 device.
> +
> +$ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: ti,tlc5925
> +
> +  shift-register-length:

Not a common property. Needs a vendor prefix and type.

> +    minimum: 8
> +    description: |
> +      The length of the shift register. If several TLC5925 are chained,
> +      shift_register_length should be set to 16 times the number of TLC5925.
> +      The value must be a multiple of 8.
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  output-enable-b-gpios:
> +    description: |
> +      Optional GPIO pins to enable/disable the parallel output. They describe
> +      the GPIOs connected to the OE/ pin of the TLC5925s.
> +
> +patternProperties:
> +  "@[0-9a-z]+$":

Unit addresses are typically hex (a-f).

> +    type: object
> +    $ref: common.yaml#
> +
> +    description: |
> +      LED pin number (must be lower than shift_register_length).
> +      The furthest LED down the chain has the pin number 0.
> +
> +    properties:
> +      reg:
> +        minimum: 0

0 is always the minimum.

> +
> +    required:
> +      - reg
> +
> +additionalProperties: true

Not allowed except for common schemas. Must be false. Since you have a 
$ref, you probably want 'unevaluatedProperties: false' instead.


> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - shift_register_length
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/leds/common.h>
> +
> +    spi0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        leds@2 {
> +            compatible = "ti,tlc5925";
> +            reg = <0x02>;
> +            spi-max-frequency = <30000000>;
> +            shift_register_length = <32>;
> +            output-enable-b-gpios = <&gpio0b 9 GPIO_ACTIVE_HIGH>, <&gpio0b 7 GPIO_ACTIVE_HIGH>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            led@0 {
> +                reg = <0>;
> +                function = LED_FUNCTION_STATUS;
> +                color = <LED_COLOR_ID_GREEN>;
> +            };
> +
> +            led@4 {
> +                reg = <4>;
> +                function = LED_FUNCTION_STATUS;
> +                color = <LED_COLOR_ID_RED>;
> +            };
> +
> +            led@1f {
> +                reg = <31>;
> +                function = LED_FUNCTION_PANIC;
> +                color = <LED_COLOR_ID_RED>;
> +            };
> +        };
> +
> +    };
> -- 
> 2.25.1
> 
> 

Re: [PATCH v2 2/3] leds: Add driver for the TLC5925 LED controller

[kernel test robot]

Hi Jean-Jacques,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pavel-leds/for-next]
[also build test WARNING on v5.18 next-20220603]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Jean-Jacques-Hiblot/Add-support-for-the-TLC5925/20220605-235250
base:   git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds.git for-next
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220606/202206060923.vYFzGndu-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 416a5080d89066029f9889dc23f94de47c2fa895)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/e8ae916efd705311a0bdeb2a8f9a1649174867be
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jean-Jacques-Hiblot/Add-support-for-the-TLC5925/20220605-235250
        git checkout e8ae916efd705311a0bdeb2a8f9a1649174867be
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/leds/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/leds/leds-tlc5925.c:144:35: warning: unused variable 'tlc5925_id' [-Wunused-const-variable]
   static const struct spi_device_id tlc5925_id[] = {
                                     ^
   1 warning generated.


vim +/tlc5925_id +144 drivers/leds/leds-tlc5925.c

   143	
 > 144	static const struct spi_device_id tlc5925_id[] = {
   145		{"tlc5925", 0},
   146		{}
   147	};
   148	MODULE_DEVICE_TABLE(spi, tlc5925_id);
   149	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

Re: [PATCH v2 2/3] leds: Add driver for the TLC5925 LED controller

[kernel test robot]

Hi Jean-Jacques,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pavel-leds/for-next]
[also build test WARNING on v5.18 next-20220603]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Jean-Jacques-Hiblot/Add-support-for-the-TLC5925/20220605-235250
base:   git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds.git for-next
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220606/202206061749.4bLA99z3-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/e8ae916efd705311a0bdeb2a8f9a1649174867be
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jean-Jacques-Hiblot/Add-support-for-the-TLC5925/20220605-235250
        git checkout e8ae916efd705311a0bdeb2a8f9a1649174867be
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/leds/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/leds/leds-tlc5925.c:144:35: warning: 'tlc5925_id' defined but not used [-Wunused-const-variable=]
     144 | static const struct spi_device_id tlc5925_id[] = {
         |                                   ^~~~~~~~~~


vim +/tlc5925_id +144 drivers/leds/leds-tlc5925.c

   143	
 > 144	static const struct spi_device_id tlc5925_id[] = {
   145		{"tlc5925", 0},
   146		{}
   147	};
   148	MODULE_DEVICE_TABLE(spi, tlc5925_id);
   149	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp