linux-kernel - Re: [PATCH v5 2/3] clk: meson: add DT documentation for emmc clock controller

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Date:   Mon, 22 Oct 2018 14:05:48 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>
CC:     Yixun Lan <yixun.lan@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        <linux-clk@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/3] clk: meson: add DT documentation for emmc clock
 controller

Hi Stephen,

Thanks for the fully review, we really appreciate your time.

Please see my comments below. 

On 2018/10/20 2:04, Stephen Boyd wrote:
> Quoting Jianxin Pan (2018-10-19 08:50:08)
>> On 2018/10/19 1:08, Stephen Boyd wrote:
>>> Quoting Jianxin Pan (2018-10-17 22:07:24)
>>>> diff --git a/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
>>>> new file mode 100644
>>>> index 0000000..9e6d343
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/clock/amlogic,mmc-clkc.txt
>>>> @@ -0,0 +1,31 @@
>>>> +* Amlogic MMC Sub Clock Controller Driver
>>>> +
>>>> +The Amlogic MMC clock controller generates and supplies clock to support
>>>> +MMC and NAND controller
>>>> +
>>>> +Required Properties:
>>>> +
>>>> +- compatible: should be:
>>>> +               "amlogic,gx-mmc-clkc"
>>>> +               "amlogic,axg-mmc-clkc"
>>>> +
>>>> +- #clock-cells: should be 1.
>>>> +- clocks: phandles to clocks corresponding to the clock-names property
>>>> +- clock-names: list of parent clock names
>>>> +       - "clkin0", "clkin1"
>>>> +
>>>> +Parent node should have the following properties :
>>>
>>> The example only has one node. Can you add two nodes?
>> OK. This clock is used by nand and emmc. I will add a new example for emmc too.
>> Thank you for your review.
> 
> Maybe I misunderstand. I thought the clk controller was two nodes, but
> it isn't? This wording is trying to explain what a consumer should look
> like?
> 
Yes.There is another clk controller.  I will add it in the next version.
sd_emmc_b_clkc: clock-controller@...0 {                  
         compatible = "amlogic,axg-mmc-clkc", "syscon";   
         reg = <0x0 0x5000 0x0 0x4>;                      
         #clock-cells = <1>;                              
                                                          
         clock-names = "clkin0", "clkin1";                
         clocks = <&clkc CLKID_SD_EMMC_B_CLK0>,           
                 <&clkc CLKID_FCLK_DIV2>;                 
};
sd_emmc_c_clkc is for nadn and mmc portC.
sd_emmc_b_clkc is for mmc portB.
> .
>