linux-kernel - Re: [PATCH] Document: dt: binding: imx: Fix PAD_CTL_DSE

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Date:   Tue, 26 Feb 2019 14:21:59 +0100
From:   Stefan Agner <stefan@...er.ch>
To:     Aisheng Dong <aisheng.dong@....com>
Cc:     Christina Quast <cquast@...overdisplays.com>, festevam@...il.com,
        shawnguo@...nel.org, kernel@...gutronix.de,
        linus.walleij@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Document: dt: binding: imx: Fix PAD_CTL_DSE_X*

On 26.02.2019 13:21, Aisheng Dong wrote:
>> From: Christina Quast [mailto:cquast@...overdisplays.com]
>> Sent: Saturday, February 23, 2019 1:01 AM
>>
>> In the iMX7d datasheet, the PAD_CTL_DSE_X* values are different from the
>> documentation.
>>
> 
> It's a doc problem.
> Latest RM seems got updated.
> 
> As here it's a reference definition in binding doc and device tree
> actually does not
> use it (IMX Pinctrl use raw data to set pad configuration). So it
> won't cause any
> compatibility issue to me.
> 
> Please update the patch title to:
> dt-bindings: pinctrl: imx7d: xxxxx
> 
> Otherwise:
> Ack-by: Dong Aisheng <aisheng.dong@....com>

Btw, I saw that imx7d-sdb.dts (and probably other i.MX 7 boards too) use
three different settings for usdhc pinctrl: 0x59, 0x5a and 0x5b (for
default, 100MHz and 200MHz respectively). One would expect that higher
frequency use higher driver strength (and this is the case for i.MX 6).
But with this new/corrected pad values this means we use x4, x2 and x6
for default, 100MHz and 200MHz respectively. This hardly seems right..?
Probably needs fixing too?

--
Stefan


> 
> Regards
> Dong Aisheng
> 
>> Signed-off-by: Christina Quast <cquast@...overdisplays.com>
>> ---
>>  .../devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt       | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
>> b/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
>> index 6666277c3acb..8ac1d0851a0f 100644
>> --- a/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
>> +++ b/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
>> @@ -48,9 +48,9 @@ PAD_CTL_HYS                     (1 << 3)
>>  PAD_CTL_SRE_SLOW                (1 << 2)
>>  PAD_CTL_SRE_FAST                (0 << 2)
>>  PAD_CTL_DSE_X1                  (0 << 0)
>> -PAD_CTL_DSE_X2                  (1 << 0)
>> -PAD_CTL_DSE_X3                  (2 << 0)
>> -PAD_CTL_DSE_X4                  (3 << 0)
>> +PAD_CTL_DSE_X4                  (1 << 0)
>> +PAD_CTL_DSE_X2                  (2 << 0)
>> +PAD_CTL_DSE_X6                  (3 << 0)
>>
> 
> 
>>  Examples:
>>  While iomuxc-lpsr is intended to be used by dedicated peripherals to take
>> --
>> 2.20.1
>>
>>
>>
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