linux-kernel - Re: [PATCH 1/2] regulator: add QCOM RPMh regulator driver

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Message-ID: <20180420224445.GB18235@codeaurora.org>
Date:   Fri, 20 Apr 2018 16:44:45 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     David Collins <collinsd@...eaurora.org>
Cc:     Stephen Boyd <swboyd@...omium.org>, broonie@...nel.org,
        lgirdwood@...il.com, mark.rutland@....com, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, rnayak@...eaurora.org
Subject: Re: [PATCH 1/2] regulator: add QCOM RPMh regulator driver

On Fri, Apr 20 2018 at 13:07 -0600, David Collins wrote:
>On 04/18/2018 10:55 PM, Stephen Boyd wrote:
>> Quoting David Collins (2018-03-22 18:30:06)
>>> On 03/21/2018 12:07 PM, Stephen Boyd wrote:
>>>> Quoting David Collins (2018-03-16 18:09:10)
>>>>> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
>>>>> index 097f617..e0ecd0a 100644

>>>>> +       ret = cmd_db_ready();
>>>>> +       if (ret < 0) {
>>>>> +               if (ret != -EPROBE_DEFER)
>>>>> +                       dev_err(dev, "Command DB not available, ret=%d\n", ret);
>>>>> +               return ret;
>>>>> +       }
>>>>
>>>> We should just make rpmh parent device call cmd_db_ready() so that these
>>>> devices aren't even populated until then and so that cmd_db_ready() is
>>>> only in one place. Lina?
>>>
>>> Let's see if Lina has qualms about this plan.
>>
>> Sounds like you're ok with it.
>
>Sure, I'll remove this check if Lina agrees to add it in the rpmh driver.
>
We want to make the RSC nodes child of Command DB? That way we probe the
controllers only if the command DB is ready?

I could do that. Just so you know, there is are no strict directives to
use Command DB. If a driver knows the information it needs to pass to
the accelerator, it may choose to skip command DB completely.

Thanks,
Lina