linux-kernel - Re: [PATCH v3 0/2] clk: bcm2835: PCM clock improvements

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Date:   Thu, 1 Jun 2017 11:36:53 +0200 (CEST)
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Phil Elwell <phil@...pberrypi.org>, linux-clk@...r.kernel.org,
        Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 0/2] clk: bcm2835: PCM clock improvements

> Phil Elwell <phil@...pberrypi.org> hat am 1. Juni 2017 um 11:10 geschrieben:
> 
> 
> The switch to using the upstream bcm2835_cprman clock driver caused a
> few problems for users of PCM (I2S) peripherals. Audio applications
> require accurate, stable clocks, and the cprman driver wasn't
> conservative enough in its choice of clock sources.
> 
> These patches restrict the clock sources for the PCM peripheral in two
> ways: the first causes all possible sources except OSC and PLLD_PER
> to be ignored, while the second allows clocks to be specified as
> "low_jitter", causing the effects of fractional divisors to be taken
> into account when comparing potential clocks for accuracy. In practice,
> the combined effect of the two patches is to choose OSC as a source if
> an integer divisor can be used, otherwise PLLD_PER is chosen.
> 
> Changes in v3:
> * Elimination of temporary variable from patch 2.

Acked-by: Stefan Wahren <stefan.wahren@...e.com>

still applies to the complete series