linux-kernel - Re: [PATCH] ARM: dts: exynos: Specify I2S assigned clocks in proper node

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Date:   Thu, 13 Dec 2018 21:56:56 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: exynos: Specify I2S assigned clocks in proper
 node

On Wed, Dec 12, 2018 at 06:57:44PM +0100, Sylwester Nawrocki wrote:
> The assigned parent clocks should be normally specified in the consumer
> device's DT node, this ensures respective driver always sees correct clock
> settings when required.
> 
> This patch fixes regression in audio subsystem on Odroid XU3/XU4 boards
> that appeared after commits:
> 
> 'commit 647d04f8e07a ("ASoC: samsung: i2s: Ensure the RCLK rate is properly determined")'
> 'commit 995e73e55f46 ("ASoC: samsung: i2s: Fix rclk_srcrate handling")'
> 'commit 48279c53fd1d ("ASoC: samsung: i2s: Prevent external abort on exynos5433 I2S1 access")'
> 
> Without this patch the driver gets wrong clock as the I2S function (op_clk)
> clock in probe() and effectively the clock which is finally assigned from DT
> is not being enabled/disabled in the runtime resume/suspend ops.
> 
> Without the above listed commits the EXYNOS_I2S_BUS clock was always set
> as parent of CLK_I2S_RCLK_SRC regardless of DT settings so there was no issue
> with not enabled EXYNOS_SCLK_I2S.
> 
> Cc: stable@...r.kernel.org # v4.17+

I gues your format would work (got recognized by stable scripts) but
strictly speaking format is different:

	Cc: <stable@...r.kernel.org> # 4.17.x

https://elixir.bootlin.com/linux/latest/source/Documentation/process/stable-kernel-rules.rst#L127

Thanks, fixed and applied.

Best regards,
Krzysztof