linux-kernel - Re: [PATCH v4 1/2] i2c: davinci: Add PM Runtime Support

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Message-ID: <021a99bb-3670-fff5-6835-b14d28827929@ti.com>
Date:   Tue, 12 Sep 2017 14:18:08 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Baolin Wang <baolin.wang@...aro.org>,
        Franklin S Cooper Jr <fcooper@...com>
CC:     Wolfram Sang <wsa@...-dreams.de>, Rob Herring <robh+dt@...nel.org>,
        <linux@...linux.org.uk>, <linux-i2c@...r.kernel.org>,
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <grygorii.strashko@...com>,
        <vigneshr@...com>
Subject: Re: [PATCH v4 1/2] i2c: davinci: Add PM Runtime Support

On Tuesday 12 September 2017 07:28 AM, Baolin Wang wrote:
>> @@ -802,13 +821,24 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>         dev->clk = devm_clk_get(&pdev->dev, NULL);
>>         if (IS_ERR(dev->clk))
>>                 return PTR_ERR(dev->clk);
>> -       clk_prepare_enable(dev->clk);

> You removed clk enable here, I think it can not work if we did not
> open CONFIG_PM macro. I think you should keep clk enable here, and set

What do you mean by "open CONFIG_PM macro" ?

> rpm active by pm_runtime_set_active() before issuing
> pm_runtime_enable().

Can you explain why you want to do this instead of relying on
pm_runtime_get_sync() to enable clock?

Thanks,
Sekhar