[v2,2/3] dt-bindings: add bindings for rk3128 clock controller

Commit Message

zhangqing May 18, 2017, 2:16 a.m. UTC

Add devicetree bindings for Rockchip cru which found on
Rockchip SoCs.

Signed-off-by: Elaine Zhang <[e-mail]>
---
 .../bindings/clock/rockchip,rk3128-cru.txt         | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt

Comments

Heiko Stuebner May 19, 2017, 10:31 a.m. UTC | #1

Hi Elaine,

Am Donnerstag, 18. Mai 2017, 10:16:58 CEST schrieb Elaine Zhang:
> Add devicetree bindings for Rockchip cru which found on
> Rockchip SoCs.
> 
> Signed-off-by: Elaine Zhang <[e-mail]>
> ---
>  .../bindings/clock/rockchip,rk3128-cru.txt         | 56 ++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt
> new file mode 100644
> index 000000000000..455a9a00a623
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt
> @@ -0,0 +1,56 @@
> +* Rockchip RK3128 Clock and Reset Unit
> +
> +The RK3128 clock controller generates and supplies clock to various
> +controllers within the SoC and also implements a reset controller for SoC
> +peripherals.
> +
> +Required Properties:
> +
> +- compatible: should be "rockchip,rk3128-cru"
> +- reg: physical base address of the controller and length of memory mapped
> +  region.
> +- #clock-cells: should be 1.
> +- #reset-cells: should be 1.
> +
> +Optional Properties:
> +
> +- rockchip,grf: phandle to the syscon managing the "general register files"
> +  If missing pll rates are not changeable, due to the missing pll lock status.
> +
> +Each clock is assigned an identifier and client nodes can use this identifier
> +to specify the clock which they consume. All available clocks are defined as
> +preprocessor macros in the dt-bindings/clock/rk3128-cru.h headers and can be
> +used in device tree sources. Similar macros exist for the reset sources in
> +these files.
> +
> +External clocks:
> +
> +There are several clocks that are generated outside the SoC. It is expected
> +that they are defined using standard clock bindings with following
> +clock-output-names:
> + - "xin24m" - crystal input - required,
> + - "ext_i2s" - external I2S clock - optional,
> + - "gmac_clkin" - external GMAC clock - optional

missing usb480m_phy as external clock, that comes back from the usbphy block.


Otherwise looks good
Heiko

Rob Herring (Arm) May 23, 2017, 2:08 p.m. UTC | #2

On Thu, May 18, 2017 at 10:16:58AM +0800, Elaine Zhang wrote:
> Add devicetree bindings for Rockchip cru which found on
> Rockchip SoCs.
> 
> Signed-off-by: Elaine Zhang <[e-mail]>
> ---
>  .../bindings/clock/rockchip,rk3128-cru.txt         | 56 ++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt

This and patch 1 can be combined, but don't have to be. For both:

Acked-by: Rob Herring <[e-mail]>

Patch

diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt
new file mode 100644
index 000000000000..455a9a00a623
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/rockchip,rk3128-cru.txt
@@ -0,0 +1,56 @@ 
+* Rockchip RK3128 Clock and Reset Unit
+
+The RK3128 clock controller generates and supplies clock to various
+controllers within the SoC and also implements a reset controller for SoC
+peripherals.
+
+Required Properties:
+
+- compatible: should be "rockchip,rk3128-cru"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- #clock-cells: should be 1.
+- #reset-cells: should be 1.
+
+Optional Properties:
+
+- rockchip,grf: phandle to the syscon managing the "general register files"
+  If missing pll rates are not changeable, due to the missing pll lock status.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. All available clocks are defined as
+preprocessor macros in the dt-bindings/clock/rk3128-cru.h headers and can be
+used in device tree sources. Similar macros exist for the reset sources in
+these files.
+
+External clocks:
+
+There are several clocks that are generated outside the SoC. It is expected
+that they are defined using standard clock bindings with following
+clock-output-names:
+ - "xin24m" - crystal input - required,
+ - "ext_i2s" - external I2S clock - optional,
+ - "gmac_clkin" - external GMAC clock - optional
+
+Example: Clock controller node:
+
+	cru: cru@20000000 {
+		compatible = "rockchip,rk3128-cru";
+		reg = <0x20000000 0x1000>;
+		rockchip,grf = <&grf>;
+
+		#clock-cells = <1>;
+		#reset-cells = <1>;
+	};
+
+Example: UART controller node that consumes the clock generated by the clock
+  controller:
+
+	uart2: serial@20068000 {
+		compatible = "rockchip,serial";
+		reg = <0x20068000 0x100>;
+		interrupts = <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <24000000>;
+		clocks = <&cru SCLK_UART2>, <&cru PCLK_UART2>;
+		clock-names = "sclk_uart", "pclk_uart";
+	};