netdev - Re: [PATCH 1/5] dt-bindings: allow dwmac-sun8i to use other devices' exported regmap

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Date:   Tue, 17 Apr 2018 07:17:56 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org, Rob Herring <robh@...nel.org>
CC:     devicetree@...r.kernel.org,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        netdev@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: Re: [PATCH 1/5] dt-bindings: allow dwmac-sun8i to use other devices' exported regmap

于 2018年4月17日 GMT+08:00 上午2:47:45, Rob Herring <robh@...nel.org> 写到:
>On Wed, Apr 11, 2018 at 10:16:37PM +0800, Icenowy Zheng wrote:
>> On some Allwinner SoCs the EMAC clock register needed by dwmac-sun8i
>is
>> in another device's memory space. In this situation dwmac-sun8i can
>use
>> a regmap exported by the other device with only the EMAC clock
>register.
>
>If this is a clock, then why not use the clock binding?

EMAC clock register is only the datasheet name. It contains
MII mode selection and delay chain configuration.

>
>> 
>> Document this situation in the dwmac-sun8i device tree binding
>> documentation.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>> ---
>>  Documentation/devicetree/bindings/net/dwmac-sun8i.txt | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>> 
>> diff --git a/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
>b/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
>> index 3d6d5fa0c4d5..0c5f63a80617 100644
>> --- a/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
>> +++ b/Documentation/devicetree/bindings/net/dwmac-sun8i.txt
>> @@ -20,8 +20,9 @@ Required properties:
>>  - phy-handle: See ethernet.txt
>>  - #address-cells: shall be 1
>>  - #size-cells: shall be 0
>> -- syscon: A phandle to the syscon of the SoC with one of the
>following
>> - compatible string:
>> +- syscon: A phandle to a device which exports the EMAC clock
>register as a
>> + regmap or to the syscon of the SoC with one of the following
>compatible
>> + string:
>>    - allwinner,sun8i-h3-system-controller
>>    - allwinner,sun8i-v3s-system-controller
>>    - allwinner,sun50i-a64-system-controller
>> -- 
>> 2.15.1
>> 
>> --
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