linux-kernel - Re: [PATCH v3 2/2] [media] atmel-isc: DT binding for Image Sensor Controller driver

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Date:	Mon, 6 Jun 2016 14:42:05 +0800
From:	"Wu, Songjun" <songjun.wu@...el.com>
To:	Rob Herring <robh@...nel.org>
CC:	<g.liakhovetski@....de>, <laurent.pinchart@...asonboard.com>,
	<nicolas.ferre@...el.com>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, Kumar Gala <galak@...eaurora.org>,
	<linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v3 2/2] [media] atmel-isc: DT binding for Image Sensor
 Controller driver

Hi Rob,

Thank you for your comments.

On 6/3/2016 07:16, Rob Herring wrote:
> On Tue, May 31, 2016 at 02:58:23PM +0800, Songjun Wu wrote:
>> DT binding documentation for ISC driver.
>>
>> Signed-off-by: Songjun Wu <songjun.wu@...el.com>
>> ---
>>
>> Changes in v3:
>> - Remove the 'atmel,sensor-preferred'.
>> - Modify the isc clock node according to the Rob's remarks.
>>
>> Changes in v2:
>> - Remove the unit address of the endpoint.
>> - Add the unit address to the clock node.
>> - Avoid using underscores in node names.
>> - Drop the "0x" in the unit address of the i2c node.
>> - Modify the description of 'atmel,sensor-preferred'.
>> - Add the description for the ISC internal clock.
>>
>>  .../devicetree/bindings/media/atmel-isc.txt        | 88 ++++++++++++++++++++++
>>  1 file changed, 88 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/media/atmel-isc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/atmel-isc.txt b/Documentation/devicetree/bindings/media/atmel-isc.txt
>> new file mode 100644
>> index 0000000..2ae1d60
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/atmel-isc.txt
>> @@ -0,0 +1,88 @@
>> +Atmel Image Sensor Controller (ISC)
>> +----------------------------------------------
>> +
>> +Required properties for ISC:
>> +- compatible
>> +	Must be "atmel,sama5d2-isc"
>> +- reg
>> +	Physical base address and length of the registers set for the device;
>> +- interrupts
>> +	Should contain IRQ line for the ISI;
>> +- clocks
>> +	List of clock specifiers, corresponding to entries in
>> +	the clock-names property;
>> +	Please refer to clock-bindings.txt.
>> +- clock-names
>> +	Required elements: "hclock", "ispck".
>> +- pinctrl-names, pinctrl-0
>> +	Please refer to pinctrl-bindings.txt.
>> +- isc-ispck
>> +	The clock for the ISC digital pipeline.
>> +	- compatible
>> +		Must be "atmel,sama5d2-isc-ispck".
>> +	- clock-cells
>> +		From common clock binding; should be set to 0.
>> +	- clocks
>> +		The clock source phandles.
>> +- isc-mck
>> +	The clock for the image sensor.
>> +	- compatible
>> +		Must be "atmel,sama5d2-isc-mck".
>> +	- clock-cells
>> +		From common clock binding; should be set to 0.
>> +	- clocks
>> +		The clock source phandles.
>> +
>> +ISC supports a single port node with parallel bus. It should contain one
>> +'port' child node with child 'endpoint' node. Please refer to the bindings
>> +defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
>> +
>> +Example:
>> +isc: isc@...08000 {
>> +	compatible = "atmel,sama5d2-isc";
>> +	reg = <0xf0008000 0x4000>;
>> +	interrupts = <46 IRQ_TYPE_LEVEL_HIGH 5>;
>> +	clocks = <&isc_clk>, <&isc_ispck>;
>> +	clock-names = "hclock", "ispck";
>> +
>> +	port {
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +
>> +		isc_0: endpoint {
>> +			remote-endpoint = <&ov7740_0>;
>> +			hsync-active = <1>;
>> +			vsync-active = <0>;
>> +			pclk-sample = <1>;
>> +		};
>> +	};
>> +
>> +	isc_ispck: isc-ispck@0 {
>
> Drop the unit-address. You should only have one if you have a reg
> property.
>
Accept. Thank you.

>> +		compatible = "atmel,sama5d2-isc-ispck";
>> +		#clock-cells = <0>;
>> +		clocks = <&isc_clk>, <&iscck>;
>> +	};
>> +
>> +	isc_mck: isc-mck@1 {
>
> ditto.
>
> I still think these should be implied by atmel,sama5d2-isc and not in
> DT. The fact that you don't have any registers for them pretty much
> indicates that. It is also strange that isc-ispck is used by isc. If
> that is the only user, there is certainly no need to put it in DT.
>
The isc-ispck in only used by isc, it can be removed from DT.
Thank you.
>
>> +		compatible = "atmel,sama5d2-isc-mck";
>> +		#clock-cells = <0>;
>> +		clocks = <&isc_clk>, <&iscck>, <&isc_gclk>;
>> +	};
>> +};
>> +
>> +i2c1: i2c@...28000 {
>> +	ov7740: camera@21 {
>> +	compatible = "ovti,ov7740";
>> +	reg = <0x21>;
>> +
>> +	clocks = <&isc_mck>;
>> +	clock-names = "xvclk";
>> +	assigned-clocks = <&isc_mck>;
>> +	assigned-clock-rates = <24000000>;
>> +
>> +	port {
>> +		ov7740_0: endpoint {
>> +			remote-endpoint = <&isc_0>;
>> +		};
>> +	};
>> +};
>> --
>> 2.7.4
>>