linux-kernel - Re: [PATCH v3 3/5] mmc: core: implement enhanced strobe support

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Message-ID: <CAD=FV=VYsBO21iLZfQkXdFpPy5v-t+k6wP_jD3NZaCz=pEFVww@mail.gmail.com>
Date:	Thu, 19 May 2016 19:19:55 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] mmc: core: implement enhanced strobe support

Shawn,

On Thu, May 19, 2016 at 6:48 PM, Shawn Lin <shawn.lin@...k-chips.com> wrote:
>>>   #define EXT_CSD_BUS_WIDTH_1    0       /* Card is in 1 bit mode */
>>>   #define EXT_CSD_BUS_WIDTH_4    1       /* Card is in 4 bit mode */
>>>   #define EXT_CSD_BUS_WIDTH_8    2       /* Card is in 8 bit mode */
>>>   #define EXT_CSD_DDR_BUS_WIDTH_4        5       /* Card is in 4 bit DDR
>>> mode */
>>>   #define EXT_CSD_DDR_BUS_WIDTH_8        6       /* Card is in 8 bit DDR
>>> mode */
>>> +#define EXT_CSD_BUS_WIDTH_STROBE BIT(7)        /* Enhanced strobe mode
>>> */
>>
>>
>> nit: while your code should be OK, it seems better to be BIT(3), since
>> above is really:
>>
>
> I don't unstand here. EXT_CSD_BUS_WIDTH_STROBE is the MSB of
> BUS_WIDTH[183] which is a 8-bit reg.

I totally misunderstood.  You are correct.

-Doug