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

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Message-ID: <154130064120.88331.5081431734592584205@swboyd.mtv.corp.google.com>
Date:   Sat, 03 Nov 2018 20:04:01 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Jerome Brunet <jbrunet@...libre.com>, Yixun Lan <dlan@...too.org>
Cc:     Jianxin Pan <jianxin.pan@...ogic.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Carlo Caione <carlo@...one.org>,
        linux-amlogic@...ts.infradead.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Qiufang Dai <qiufang.dai@...ogic.com>
Subject: Re: [PATCH v5 2/3] clk: meson: add DT documentation for emmc clock controller

Quoting Yixun Lan (2018-10-25 00:29:15)
> yes, I think the documentation need to be fixed
> 
> for the final solution, we decide to make 'mmc-clkc' an independent node
> instead of being a sub-node of 'mmc', so both of them may exist in parallel..
> 
> the DT part may like this:
> 
>                         sd_emmc_c_clkc: clock-controller@...0 {
>                                 compatible = "amlogic,axg-mmc-clkc", "syscon";
>                                 reg = <0x0 0x7000 0x0 0x4>;
>                                 ...
>                         };
> 
>                         sd_emmc_c: mmc@...0 {
>                                 compatible = "amlogic,axg-mmc";
>                                 reg = <0x0 0x7000 0x0 0x800>;
>                                 ...
>                         };

That's improper usage of DT. We don't want two devices at the same
register offset.