linux-kernel - Re: [PATCH] platform/chrome: cros_ec_debugfs: Support pd

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Message-ID: <7b391f5e-8200-ddc5-eb56-164c6006a134@collabora.com>
Date:   Wed, 16 Sep 2020 11:38:56 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH] platform/chrome: cros_ec_debugfs: Support pd_info v2
 format

Hi Prashant,

On 15/9/20 17:34, Prashant Malani wrote:
> HI Enric,
> 
> On Tue, Sep 15, 2020 at 5:48 AM Enric Balletbo i Serra
> <enric.balletbo@...labora.com> wrote:
>>
>> Hi Stephen, Prashant,
>>
>> On 9/9/20 6:04, Stephen Boyd wrote:
>>> Let's try to read more information out of more modern cros_ec devices by
>>> using the v2 format first and then fall back to the v1 format. This
>>> gives us more information about things such as DP mode of the typec pins
>>> and the CC state, along with some more things.
>>>
>>> Cc: Gwendal Grignou <gwendal@...omium.org>
>>> Cc: Prashant Malani <pmalani@...omium.org>
>>> Cc: Guenter Roeck <groeck@...omium.org>
>>> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
>>> ---
>>>
>>
>> I saw some discussion going on in gerrit (a pity the discussion didn't happen in
>> mainline) Did you end with a conclusion? Can I remove this patch from my backlog?
> 
> My apologies for not posting the comment here.
> To summarize: the userspace EC utility ectool [1] can offer the
> equivalent output, but with better formatting. So I believe the
> decision is to use that instead of this patch.
> I also posed a counter-question: can we remove this debugfs pdinfo
> file entirely, since we can pull this information using ectool?
> 

If I am not mistaken pdinfo is used by your userspace, so, assuming we don't
break (or we have a plan to not break) things I'm fine with it. In general,
delegating things to userspace and get rid of kernel code is good for everyone.

Thanks,
 Enric

> [1]: https://chromium.googlesource.com/chromiumos/platform/ec/+/refs/heads/master/util/ectool.c
> 
> Best regards,
>