diff mbox

[1/3] clk: meson: add DT documentation for emmc clock controller

Message ID 20180703145716.31860-2-yixun.lan@amlogic.com (mailing list archive)
State Changes Requested, archived
Headers show

Commit Message

Yixun Lan July 3, 2018, 2:57 p.m. UTC 
Document the EMMC sub clock controller driver, the potential consumer
of this driver is EMMC or NAND.

Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
---
 .../bindings/clock/amlogic,emmc-clkc.txt      | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt

Comments

Jerome Brunet July 3, 2018, 8:16 a.m. UTC | #1 
On Tue, 2018-07-03 at 14:57 +0000, Yixun Lan wrote:
> Document the EMMC sub clock controller driver, the potential consumer
> of this driver is EMMC or NAND.
> 
> Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
> ---
>  .../bindings/clock/amlogic,emmc-clkc.txt      | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
> new file mode 100644
> index 000000000000..5534bd446363
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
> @@ -0,0 +1,45 @@
> +* Amlogic EMMC Sub Clock Controller Driver
> +
> +The Amlogic EMMC clock controller generates and supplies clock to support
> +EMMC and NAND controller
> +
> +Required Properties:
> +
> +- compatible: should be:
> +		"amlogic,emmc-clkc"

missing clocks and clock-names here

> +
> +- #clock-cells: should be 1.
> +
> +Two clocks are provided as the parent of this EMMC clock controller driver from
> +upper layer clock controller - eg "amlogic,axg-clkc" in AXG platfrom.
> +The main consumer of this driver is EMMC or NAND, to specify which the clock
> +they may consume, the preprocessor macros in the dt-bindings/clock/emmc-clkc.h
> +header and can be used in device tree sources.

Not sure this explanation belongs in dt-binding documentation.
Maybe this should be in the driver itself.

> +
> +Parent node should have the following properties :
> +- compatible: "syscon", "simple-mfd, and "amlogic,emmc-clkc"
> +- reg: base address and size of the EMMC control register space.
> +
> +Example: Clock controller node:
> +
> +sd_emmc_c_clkc: clock-controller@7000 {
> +	compatible = "amlogic,emmc-clkc", "syscon", "simple-mfd";
> +	reg = <0x0 0x7000 0x0 0x4>;
> +	#clock-cells = <1>;
> +
> +	clock-names = "clkin0", "clkin1";
> +	clocks = <&clkc CLKID_SD_EMMC_C_CLK0>,
> +			<&clkc CLKID_FCLK_DIV2>;
> +};
> +

Not sure the following is necessary, you don't really to show how to use a clock
controller.

> +Example: NAND controller node that consumes the clock generated by the clock
> +  controller:
> +
> +	nand: nfc@7800 {
> +		compatible = "amlogic,meson-axg-nfc";
> +		reg = <0x0 0x7800 0x0 0x100>;
> +		interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
> +		clocks = <&clkc CLKID_SD_EMMC_C>,
> +				<&sd_emmc_c_clkc CLKID_EMMC_C_DIV>;
> +		clock-names = "core", "device";
> +	};

--
To unsubscribe from this list: send the line "unsubscribe linux-clk" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Yixun Lan July 3, 2018, 9:59 a.m. UTC | #2 
Hi jerome

On 07/03/18 16:16, Jerome Brunet wrote:
> On Tue, 2018-07-03 at 14:57 +0000, Yixun Lan wrote:
>> Document the EMMC sub clock controller driver, the potential consumer
>> of this driver is EMMC or NAND.
>>
>> Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
>> ---
>>  .../bindings/clock/amlogic,emmc-clkc.txt      | 45 +++++++++++++++++++
>>  1 file changed, 45 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
>> new file mode 100644
>> index 000000000000..5534bd446363
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
>> @@ -0,0 +1,45 @@
>> +* Amlogic EMMC Sub Clock Controller Driver
>> +
>> +The Amlogic EMMC clock controller generates and supplies clock to support
>> +EMMC and NAND controller
>> +
>> +Required Properties:
>> +
>> +- compatible: should be:
>> +		"amlogic,emmc-clkc"
> 
> missing clocks and clock-names here
> 
ok, will update

>> +
>> +- #clock-cells: should be 1.
>> +
>> +Two clocks are provided as the parent of this EMMC clock controller driver from
>> +upper layer clock controller - eg "amlogic,axg-clkc" in AXG platfrom.
>> +The main consumer of this driver is EMMC or NAND, to specify which the clock
>> +they may consume, the preprocessor macros in the dt-bindings/clock/emmc-clkc.h
>> +header and can be used in device tree sources.
> 
> Not sure this explanation belongs in dt-binding documentation.
> Maybe this should be in the driver itself.
> 
ok, I probably will waiting for more comments coming in ;-)

>> +
>> +Parent node should have the following properties :
>> +- compatible: "syscon", "simple-mfd, and "amlogic,emmc-clkc"
>> +- reg: base address and size of the EMMC control register space.
>> +
>> +Example: Clock controller node:
>> +
>> +sd_emmc_c_clkc: clock-controller@7000 {
>> +	compatible = "amlogic,emmc-clkc", "syscon", "simple-mfd";
>> +	reg = <0x0 0x7000 0x0 0x4>;
>> +	#clock-cells = <1>;
>> +
>> +	clock-names = "clkin0", "clkin1";
>> +	clocks = <&clkc CLKID_SD_EMMC_C_CLK0>,
>> +			<&clkc CLKID_FCLK_DIV2>;
>> +};
>> +
> 
> Not sure the following is necessary, you don't really to show how to use a clock
> controller.
> 
ditto,

and I'm fine with either way, this was a copy & paste from gxbb-clkc.h


>> +Example: NAND controller node that consumes the clock generated by the clock
>> +  controller:
>> +
>> +	nand: nfc@7800 {
>> +		compatible = "amlogic,meson-axg-nfc";
>> +		reg = <0x0 0x7800 0x0 0x100>;
>> +		interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
>> +		clocks = <&clkc CLKID_SD_EMMC_C>,
>> +				<&sd_emmc_c_clkc CLKID_EMMC_C_DIV>;
>> +		clock-names = "core", "device";
>> +	};
> 
> .
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-clk" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
new file mode 100644
index 000000000000..5534bd446363
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/amlogic,emmc-clkc.txt
@@ -0,0 +1,45 @@ 
+* Amlogic EMMC Sub Clock Controller Driver
+
+The Amlogic EMMC clock controller generates and supplies clock to support
+EMMC and NAND controller
+
+Required Properties:
+
+- compatible: should be:
+		"amlogic,emmc-clkc"
+
+- #clock-cells: should be 1.
+
+Two clocks are provided as the parent of this EMMC clock controller driver from
+upper layer clock controller - eg "amlogic,axg-clkc" in AXG platfrom.
+The main consumer of this driver is EMMC or NAND, to specify which the clock
+they may consume, the preprocessor macros in the dt-bindings/clock/emmc-clkc.h
+header and can be used in device tree sources.
+
+Parent node should have the following properties :
+- compatible: "syscon", "simple-mfd, and "amlogic,emmc-clkc"
+- reg: base address and size of the EMMC control register space.
+
+Example: Clock controller node:
+
+sd_emmc_c_clkc: clock-controller@7000 {
+	compatible = "amlogic,emmc-clkc", "syscon", "simple-mfd";
+	reg = <0x0 0x7000 0x0 0x4>;
+	#clock-cells = <1>;
+
+	clock-names = "clkin0", "clkin1";
+	clocks = <&clkc CLKID_SD_EMMC_C_CLK0>,
+			<&clkc CLKID_FCLK_DIV2>;
+};
+
+Example: NAND controller node that consumes the clock generated by the clock
+  controller:
+
+	nand: nfc@7800 {
+		compatible = "amlogic,meson-axg-nfc";
+		reg = <0x0 0x7800 0x0 0x100>;
+		interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
+		clocks = <&clkc CLKID_SD_EMMC_C>,
+				<&sd_emmc_c_clkc CLKID_EMMC_C_DIV>;
+		clock-names = "core", "device";
+	};