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

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Date:   Fri, 14 Dec 2018 07:59:00 +0100
From:   Greg KH <greg@...ah.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Sylwester Nawrocki <s.nawrocki@...sung.com>, 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 Thu, Dec 13, 2018 at 09:56:56PM +0100, Krzysztof Kozlowski wrote:
> 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

Either works just fine, my scripts have to be a bit flexible due to all
of the odd ways people like to tag things here...

thanks,

greg k-h