diff mbox series

[v5,1/3] dt-bindings: leds: Add bindings for the TLC5925 controller

Message ID 20220614154245.354167-2-jjhiblot@traphandler.com
State Superseded
Headers show
Series Add support for the TLC5925 | expand

Commit Message

Jean-Jacques Hiblot June 14, 2022, 3:42 p.m. UTC
Add bindings documentation for the TLC5925 LED controller.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
---
 .../devicetree/bindings/leds/ti,tlc5925.yaml  | 107 ++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml

Comments

Rob Herring June 17, 2022, 11:19 p.m. UTC | #1
On Tue, Jun 14, 2022 at 05:42:43PM +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  | 107 ++++++++++++++++++
>  1 file changed, 107 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..12a71e48f854
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
> @@ -0,0 +1,107 @@
> +# 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
> +
> +  ti,shift-register-length:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 8
> +    description: |

Don't need '|' if no formatting to preserve.

> +      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.

multipleOf: 8

Though I'm confused why it's not 16.

> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  output-enable-b-gpios:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array

Already has a type.

> +    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-f]+$":
> +    type: object
> +    $ref: common.yaml#

       unevaluatedProperties: false

> +
> +    properties:
> +      reg:
> +        $ref: /schemas/types.yaml#/definitions/uint32

Don't need a type here.

> +        description: |
> +          LED pin number (must be lower than ti,shift-register-length).
> +          The furthest LED down the chain has the pin number 0.
> +
> +    required:
> +      - reg
> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ti,shift-register-length

Is there not a default when not chained? 

> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/leds/common.h>
> +
> +    spi0 {

spi {

> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        leds@2 {
> +            compatible = "ti,tlc5925";
> +            reg = <0x02>;
> +            spi-max-frequency = <30000000>;
> +            ti,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
> 
>
Jean-Jacques Hiblot June 27, 2022, 7:57 a.m. UTC | #2
On 18/06/2022 01:19, Rob Herring wrote:
> On Tue, Jun 14, 2022 at 05:42:43PM +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  | 107 ++++++++++++++++++
>>   1 file changed, 107 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..12a71e48f854
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
>> @@ -0,0 +1,107 @@
>> +# 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
>> +
>> +  ti,shift-register-length:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 8
>> +    description: |
> Don't need '|' if no formatting to preserve.
>
>> +      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.
> multipleOf: 8
>
> Though I'm confused why it's not 16.

The reason why it is 8 instead of 16, is that there exists other LEDs 
controllers that are compatible with this driver and use only a 8-bits 
shift register.

The main reason is that the granularity of the size of a SPI transfer is 
8 bits.

>> +
>> +  "#address-cells":
>> +    const: 1
>> +
>> +  "#size-cells":
>> +    const: 0
>> +
>> +  output-enable-b-gpios:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> Already has a type.
>
>> +    description: |
>> +      Optional GPIO pins to enable/disable the parallel output. They describe
>> +      the GPIOs connected to the OE/ pin of the TLC5925s.
>> +
>> +patternProperties:
>> +  "@[0-9a-f]+$":
>> +    type: object
>> +    $ref: common.yaml#
>         unevaluatedProperties: false
>
>> +
>> +    properties:
>> +      reg:
>> +        $ref: /schemas/types.yaml#/definitions/uint32
> Don't need a type here.
>
>> +        description: |
>> +          LED pin number (must be lower than ti,shift-register-length).
>> +          The furthest LED down the chain has the pin number 0.
>> +
>> +    required:
>> +      - reg
>> +
>> +required:
>> +  - "#address-cells"
>> +  - "#size-cells"
>> +  - ti,shift-register-length
> Is there not a default when not chained?

A default value could be used indeed. I'll rework the driver to use a 
default value of 16

Thanks

Jean-Jacques

>
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/gpio/gpio.h>
>> +    #include <dt-bindings/leds/common.h>
>> +
>> +    spi0 {
> spi {
>
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +
>> +        leds@2 {
>> +            compatible = "ti,tlc5925";
>> +            reg = <0x02>;
>> +            spi-max-frequency = <30000000>;
>> +            ti,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
>>
>>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
new file mode 100644
index 000000000000..12a71e48f854
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
@@ -0,0 +1,107 @@ 
+# 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
+
+  ti,shift-register-length:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    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:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      Optional GPIO pins to enable/disable the parallel output. They describe
+      the GPIOs connected to the OE/ pin of the TLC5925s.
+
+patternProperties:
+  "@[0-9a-f]+$":
+    type: object
+    $ref: common.yaml#
+
+    properties:
+      reg:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          LED pin number (must be lower than ti,shift-register-length).
+          The furthest LED down the chain has the pin number 0.
+
+    required:
+      - reg
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - ti,shift-register-length
+
+unevaluatedProperties: false
+
+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>;
+            ti,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>;
+            };
+        };
+
+    };