linux-kernel - Re: [PATCH v6 00/19] Move PMC clocks into Tegra PMC driver

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Date:   Wed, 8 Jan 2020 03:40:23 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     jonathanh@...dia.com, broonie@...nel.org, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, mperttunen@...dia.com,
        gregkh@...uxfoundation.org, sboyd@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, pdeschrijver@...dia.com, pgaikwad@...dia.com,
        spujar@...dia.com, josephl@...dia.com, daniel.lezcano@...aro.org,
        mmaddireddy@...dia.com, markz@...dia.com,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 00/19] Move PMC clocks into Tegra PMC driver

07.01.2020 19:50, Sowjanya Komatineni пишет:
> 
> On 1/7/20 4:21 AM, Thierry Reding wrote:
>> On Mon, Jan 06, 2020 at 08:13:59PM -0800, Sowjanya Komatineni wrote:
>>> This patch series moves Tegra PMC clocks from clock driver to pmc driver
>>> along with the device trees changes and audio driver which uses one of
>>> the pmc clock for audio mclk.
>>>
>>> Tegra PMC has clk_out_1, clk_out_2, clk_out_3 and blink controls which
>>> are currently registered by Tegra clock driver using clk_regiser_mux and
>>> clk_register_gate which performs direct Tegra PMC register access.
>>>
>>> When Tegra PMC is in secure mode, any access from non-secure world will
>>> not go through.
>>>
>>> This patch series adds these Tegra PMC clocks and blink controls to
>>> Tegra
>>> PMC driver with PMC as clock provider and removes them from Tegra clock
>>> driver.
>>>
>>> PMC clock clk_out_1 is dedicated for audio mclk from Tegra30 thru
>>> Tegra210
>>> and clock driver does inital parent configuration for it and enables
>>> them.
>>> But this clock should be taken care by audio driver as there is no need
>>> to have this clock pre enabled.
>>>
>>> So, this series also includes patch that updates ASoC driver to take
>>> care of parent configuration for mclk if device tree don't specify
>>> initial parent configuration using assigned-clock-parents and controls
>>> audio mclk enable/disable during ASoC machine startup and shutdown.
>>>
>>> DTs are also updated to use clk_out_1 as audio mclk rather than extern1.
>>>
>>> This series also includes a patch for mclk fallback to extern1 when
>>> retrieving mclk fails to have this backward compatible of new DT with
>>> old kernels.
>> Hi Sowjanya,
>>
>> this looks like it's almost ready to merge. Can you highlight if there
>> are any build-time or runtime dependencies between the patches? The
>> audio driver changes seem to be mostly isolated from the rest by the
>> fallback implementation for legacy device trees.
>>
>> Is there anything that I need to keep in mind when applying these? And
>> would it be fine for Mark to pick up the ASoC patches separately from
>> the rest?
>>
>> Thierry
> 
> Yes, ASoC patches can be picked separately.
> 
> dependencies are b/w clock and pmc driver patches.

Technically, the ASoC compatibility patches should be applied before the
CaR changes. But perhaps it's not critical if audio fails during git's
bisection.