linux-kernel - Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver

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Date:   Sat, 25 Apr 2020 16:19:47 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <frankc@...dia.com>, <hverkuil@...all.nl>,
        <sakari.ailus@....fi>, <helen.koike@...labora.com>
CC:     <sboyd@...nel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver


On 4/25/20 4:13 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 24.04.2020 06:55, Sowjanya Komatineni пишет:
>> +static int __maybe_unused vi_runtime_resume(struct device *dev)
>> +{
>> +     struct tegra_vi *vi = dev_get_drvdata(dev);
>> +     int ret;
>> +
>> +     ret = regulator_enable(vi->vdd);
>> +     if (ret) {
>> +             dev_err(dev, "failed to enable VDD supply: %d\n", ret);
>> +             return ret;
>> +     }
>> +
>> +     ret = clk_set_rate(vi->clk, vi->soc->vi_max_clk_hz);
>> +     if (ret) {
>> +             dev_err(dev, "failed to set vi clock rate: %d\n", ret);
>> +             goto disable_vdd;
>> +     }
> Isn't setting clock rate using assigned-clocks in a device-tree enough?
> Could you please clarify why this vi_max_clk_hz is needed?

Max clock rate with sensor support will be 998Mhz.

Later when sensor support is added, based on TPG or Sensor mode clock 
rate will be set here