netdev - Re: [PATCH net-next v2 15/15] arm64: dts: allwinner: a64: add SRAM controller device tree node

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Date:   Wed, 02 May 2018 18:19:51 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org, Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>
CC:     Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next v2 15/15] arm64: dts: allwinner: a64: add SRAM controller device tree node

于 2018年5月2日 GMT+08:00 下午5:53:21, Chen-Yu Tsai <wens@...e.org> 写到:
>On Wed, May 2, 2018 at 5:51 PM, Maxime Ripard
><maxime.ripard@...tlin.com> wrote:
>> Hi,
>>
>> On Wed, May 02, 2018 at 12:12:27AM +0800, Chen-Yu Tsai wrote:
>>> From: Icenowy Zheng <icenowy@...c.io>
>>>
>>> Allwinner A64 has a SRAM controller, and in the device tree
>currently
>>> we have a syscon node to enable EMAC driver to access the EMAC clock
>>> register. As SRAM controller driver can now export regmap for this
>>> register, replace the syscon node to the SRAM controller device
>node,
>>> and let EMAC driver to acquire its EMAC clock regmap.
>>>
>>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>>> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
>>> ---
>>>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 23
>+++++++++++++++----
>>>  1 file changed, 19 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>>> index 1b2ef28c42bd..1c37659d9d41 100644
>>> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
>>> @@ -168,10 +168,25 @@
>>>               #size-cells = <1>;
>>>               ranges;
>>>
>>> -             syscon: syscon@...0000 {
>>> -                     compatible =
>"allwinner,sun50i-a64-system-controller",
>>> -                             "syscon";
>>> +             sram_controller: sram-controller@...0000 {
>>> +                     compatible =
>"allwinner,sun50i-a64-sram-controller";
>>
>> I don't think there's anything preventing us from keeping the
>> -system-controller compatible. It's what was in the DT before, and
>> it's how it's called in the datasheet.
>
>I actually meant to ask you about this. The -system-controller
>compatible
>matches the datasheet better. Maybe we should just switch to that one?

No, if we do the switch the system-controller compatible,
the device will be probed on the same memory region with
a syscon on old DTs.

>
>ChenYu
>
>> Otherwise, the whole serie looks good to me:
>> Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>
>>
>> Maxime
>>
>> --
>> Maxime Ripard, Bootlin (formerly Free Electrons)
>> Embedded Linux and Kernel engineering
>> https://bootlin.com
>
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>linux-arm-kernel@...ts.infradead.org
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