linux-kernel - Re: [PATCH 5/6] dt-bindings: add documentation of rk3399 clock controller

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Date:	Fri, 19 Feb 2016 09:05:13 +0800
From:	Jianqun Xu <jay.xu@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	Rob Herring <robh@...nel.org>, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, jwerner@...omium.org, broonie@...nel.org,
	catalin.marinas@....com, will.deacon@....com, sboyd@...eaurora.org,
	linus.walleij@...aro.org, sjoerd.simons@...labora.co.uk,
	huangtao@...k-chips.com, linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, Xing Zheng <zhengxing@...k-chips.com>
Subject: Re: [PATCH 5/6] dt-bindings: add documentation of rk3399 clock
 controller

Hi Heiko

在 19/02/2016 08:53, Heiko Stuebner 写道:
> Am Freitag, 19. Februar 2016, 08:48:15 schrieb Jianqun Xu:
>> Hi Rob
>>
>> 在 18/02/2016 22:36, Rob Herring 写道:
>>> On Wed, Feb 17, 2016 at 09:54:49AM +0800, jianqun.xu wrote:
>>>> From: Xing Zheng <zhengxing@...k-chips.com>
>>>>
>>>> Add the devicetree binding for the cru on the rk3399 which quite
>>>> similar structured as previous clock controllers.
>>>>
>>>> Signed-off-by: Xing Zheng <zhengxing@...k-chips.com>
>>>> ---
>>>>
>>>>    .../bindings/clock/rockchip,rk3399-cru.txt         | 82
>>>>    ++++++++++++++++++++++ 1 file changed, 82 insertions(+)
>>>>    create mode 100644
>>>>    Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt
>>>> b/Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt new
>>>> file mode 100644
>>>> index 0000000..07bcc6e
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/clock/rockchip,rk3399-cru.txt
>>>> @@ -0,0 +1,82 @@
>>>> +* Rockchip RK3399 Clock and Reset Unit
>>>
>>> [...]
>>>
>>>> +Example: General Register Files
>>>> +
>>>> +	pmugrf: syscon@...20000 {
>>>> +		compatible = "rockchip,rk3399-pmugrf", "syscon";
>>>
>>> Is this documented?
>>
>> Since there is no documentation for rockchip grf from early SoCs, I
>> think if we need to add a new devicetree documentation, such as
>> Documentation/devicetree/bindings/clock/rockchip,rk3399-grf.txt ?
>
> The grf is not clock-specific, so the directory is probably not correct.
> I'd think bindings/arm/rockchip/grf.txt might be better or
> bindings/soc/rockchip/grf.txt or somewhere else. And define the properties
> for all per-soc GRFs in there.
>
> In any case we really should add the missing grf binding documentation (in a
> separate patch of course), as the grf is a pretty commonly used shared
> component.
>
Got it, I will add bindings/soc/rockchip/grf.txt in next patch
Thanks !
>
>>
>> If you agree, I will add it in next patch
>>
>>>> +		reg = <0x0 0xff320000 0x0 0x1000>;
>>>> +	};
>>>> +
>>>> +	grf: syscon@...70000 {
>>>> +		compatible = "rockchip,rk3399-grf", "syscon";
>>>
>>> ditto.
>>>
>>>> +		reg = <0x0 0xff770000 0x0 0x10000>;
>>>> +	};
>>>> +
>>>> +Example: Clock controller node:
>>>> +
>>>> +	pmucru: pmu-clock-controller@...50000 {
>>>> +		compatible = "rockchip,rk3399-pmucru";
>>>> +		reg = <0x0 0xff750000 0x0 0x1000>;
>>>> +		#clock-cells = <1>;
>>>> +		#reset-cells = <1>;
>>>> +	};
>>>> +
>>>> +	cru: clock-controller@...60000 {
>>>> +		compatible = "rockchip,rk3399-cru";
>>>> +		reg = <0x0 0xff760000 0x0 0x1000>;
>>>> +		rockchip,grf = <&grf>;
>>>> +		#clock-cells = <1>;
>>>> +		#reset-cells = <1>;
>>>> +	};
>>>> +
>>>> +Example: UART controller node that consumes the clock generated by the
>>>> clock +  controller:
>>>> +
>>>> +	uart0: serial@...a0000 {
>>>> +		compatible = "rockchip,rk3399-uart", "snps,dw-apb-uart";
>>>> +		reg = <0x0 0xff180000 0x0 0x100>;
>>>> +		clocks = <&cru SCLK_UART0>, <&cru PCLK_UART0>;
>>>> +		clock-names = "baudclk", "apb_pclk";
>>>> +		interrupts = <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>;
>>>> +		reg-shift = <2>;
>>>> +		reg-io-width = <4>;
>>>> +	};
>>>> --
>>>> 1.9.1
>
>
>
>