linux-kernel - Re: [PATCH] ARM: dts: exynos: revert "add input clock to CMU in Exynos4412 Odroid"

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Date:   Tue, 22 Sep 2020 17:57:02 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] ARM: dts: exynos: revert "add input clock to CMU in
 Exynos4412 Odroid"

On Mon, Sep 21, 2020 at 07:48:18PM +0200, Krzysztof Kozlowski wrote:
> This reverts commit eaf2d2f6895d676dda6c95a652b58594f2887720.
> 
> The commit eaf2d2f6895d ("ARM: dts: exynos: add input clock to CMU in
> Exynos4412 Odroid") breaks probing of usb3503 USB hub on Odroid U3.
> 
> It changes the order of clock drivers probe: the clkout (Exynos PMU)
> driver is probed before the main clk-exynos4 driver.  The clkout driver
> on Exynos4412 depends on clk-exynos4 but it does not support deferred
> probe, therefore this dependency and changed probe order causes probe
> failure.
> 
> The usb3503 USB hub on Odroid U3 on the other hand requires clkout
> clock.  This can be seen in logs:
> 
>     [    5.007442] usb3503 0-0008: unable to request refclk (-517)
> 
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 1 -

Applied.

Best regards,
Krzysztof