linux-kernel - Re: [PATCH 0/2] Add a regmap to Allwinner R40 CCU to export GMAC register

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Date:   Mon, 09 Oct 2017 15:22:50 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:     Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Add a regmap to Allwinner R40 CCU to export GMAC register



于 2017年10月9日 GMT+08:00 下午3:18:09, Maxime Ripard <maxime.ripard@...e-electrons.com> 写到:
>On Fri, Oct 06, 2017 at 06:33:31AM +0000, Icenowy Zheng wrote:
>> In the CCU of the Allwinner R40 SoC, there's a GMAC configuration
>register,
>> which is intended to be accessed by the dwmac-sun8i driver. On SoCs
>already
>> supported by the driver the register is placed in the syscon rather
>than
>> the CCU.
>> 
>> As CCU is a critical part of the SoC, so write to it should be
>strictly
>> limited. A regmap with restricted write permission is created by the
>R40
>> CCU driver, and can be get with dev_get_regmap. In order to tie the
>regmap
>> to the CCU device, the R40 CCU is now a platform driver, so a
>platform
>> device is created for it (and then tied with the regmap).
>> 
>> The first patch does the conversion of the driver to a platform
>driver,
>> and the second patch adds the regmap.
>
>I'd like to see first what you want to do with it.

Export the GMAC configuration register to dwmac-sun8i.

>
>Maxime