[v3,3/5] dt-bindings: add binding for clock-controller of s3c2443 and following

Commit Message

Heiko Stuebner Dec. 3, 2013, 3:23 p.m. UTC

Starting with the s3c2443 the s3c24xx series got a new clock tree
compared to the previous s3c24xx socs. This binding describes the
clock controller found in the s3c2443, s3c2416 and s3c2450 socs.

Signed-off-by: Heiko Stuebner <[e-mail]>
---
 .../bindings/clock/samsung,s3c2443-clock.txt       |   46 ++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt

Comments

Tomasz Figa Dec. 9, 2013, 5:03 p.m. UTC | #1

Hi Heiko,

On Tuesday 03 of December 2013 16:23:09 Heiko Stübner wrote:
> Starting with the s3c2443 the s3c24xx series got a new clock tree
> compared to the previous s3c24xx socs. This binding describes the
> clock controller found in the s3c2443, s3c2416 and s3c2450 socs.
> 
> Signed-off-by: Heiko Stuebner <[e-mail]>
> ---
>  .../bindings/clock/samsung,s3c2443-clock.txt       |   46 ++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt b/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt
> new file mode 100644
> index 0000000..a3eb4ed
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt
> @@ -0,0 +1,46 @@
> +* Samsung S3C2443 Clock Controller
> +
> +The S3C2443 clock controller generates and supplies clock to various controllers
> +within the SoC. The clock binding described here is applicable to all SoCs in
> +the s3c24x family starting with the s3c2443.
> +
> +Required Properties:
> +
> +- compatible: should be one of the following.
> +  - "samsung,s3c2416-clock" - controller compatible with S3C2416 SoC.
> +  - "samsung,s3c2443-clock" - controller compatible with S3C2443 SoC.
> +  - "samsung,s3c2450-clock" - controller compatible with S3C2450 SoC.
> +- reg: physical base address of the controller and length of memory mapped
> +  region.
> +- #clock-cells: should be 1.
> +
> +Each clock is assigned an identifier and client nodes can use this identifier
> +to specify the clock which they consume. Some of the clocks are available only
> +on a particular SoC.
> +
> +All available clocks are defined as preprocessor macros in
> +dt-bindings/clock/samsung,s3c2443-clock.h header and can be used in device
> +tree sources.

I believe this driver needs some external clocks to be defined as fixed
rate clocks using generic bindings. It should be noted what clocks are
needed here in the documentation.

Otherwise the patch looks fine.

Best regards,
Tomasz

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Patch

diff --git a/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt b/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt
new file mode 100644
index 0000000..a3eb4ed
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/samsung,s3c2443-clock.txt
@@ -0,0 +1,46 @@ 
+* Samsung S3C2443 Clock Controller
+
+The S3C2443 clock controller generates and supplies clock to various controllers
+within the SoC. The clock binding described here is applicable to all SoCs in
+the s3c24x family starting with the s3c2443.
+
+Required Properties:
+
+- compatible: should be one of the following.
+  - "samsung,s3c2416-clock" - controller compatible with S3C2416 SoC.
+  - "samsung,s3c2443-clock" - controller compatible with S3C2443 SoC.
+  - "samsung,s3c2450-clock" - controller compatible with S3C2450 SoC.
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- #clock-cells: should be 1.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. Some of the clocks are available only
+on a particular SoC.
+
+All available clocks are defined as preprocessor macros in
+dt-bindings/clock/samsung,s3c2443-clock.h header and can be used in device
+tree sources.
+
+Example: Clock controller node:
+
+	clocks: clock-controller@4c000000 {
+		compatible = "samsung,s3c2416-clock";
+		reg = <0x4c000000 0x40>;
+		#clock-cells = <1>;
+	};
+
+Example: UART controller node that consumes the clock generated by the clock
+  controller (refer to the standard clock bindings for information about
+  "clocks" and "clock-names" properties):
+
+	serial@50004000 {
+		compatible = "samsung,s3c2440-uart";
+		reg = <0x50004000 0x4000>;
+		interrupts = <1 23 3 4>, <1 23 4 4>;
+		clock-names = "uart", "clk_uart_baud2",
+				"clk_uart_baud3";
+		clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
+				<&clocks SCLK_UART>;
+		status = "disabled";
+	};