linux-kernel - Re: [PATCH v4] clk: bcm2835: Add support for programming the audio domain clocks.

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Date:	Tue, 06 Oct 2015 18:24:44 -0700
From:	Eric Anholt <eric@...olt.net>
To:	Stefan Wahren <info@...egoodbye.de>, linux-clk@...r.kernel.org
Cc:	devicetree@...r.kernel.org,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] clk: bcm2835: Add support for programming the audio domain clocks.

Stefan Wahren <info@...egoodbye.de> writes:

> Hi Eric,
>
> Am 02.10.2015 um 21:54 schrieb Eric Anholt:
>> This adds support for enabling, disabling, and setting the rate of the
>> audio domain clocks.  It will be necessary for setting the pixel clock
>> for HDMI in the VC4 driver and let us write a cpufreq driver.  It will
>> also improve compatibility with user changes to the firmware's
>> config.txt, since our previous fixed clocks are unaware of it.
>>
>> The firmware also has support for configuring the clocks through the
>> mailbox channel, but the pixel clock setup by the firmware doesn't
>> work, and it's Raspberry Pi specific anyway.  The only conflicts we
>> should have with the firmware would be if we made firmware calls that
>> result in clock management (like opening firmware V3D or ISP access,
>> which we don't support in upstream), or on hardware over-thermal or
>> under-voltage (when the firmware would rewrite PLLB to take the ARM
>> out of overclock).  If that happens, our cached .recalc_rate() results
>> would be incorrect, but that's no worse than our current state where
>> we used fixed clocks.
>>
>> The existing fixed clocks in the code are left in place to provide
>> backwards compatibility with old device tree files.
>
> only a few nits.

I think I've done all of these now, sending out v5.

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