linux-kernel - Re: [PATCH 1/2] ARM: dts: exynos: Add CLK_ACLK432_SCALER clock to gsc

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Message-ID: <1a244e36-a965-3efb-4413-b40e8c549cf9@osg.samsung.com>
Date:   Fri, 20 Jan 2017 07:11:04 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     linux-kernel@...r.kernel.org
Cc:     Inki Dae <inki.dae@...sung.com>,
        Andi Shyti <andi.shyti@...sung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        devicetree@...r.kernel.org, Kukjin Kim <kgene@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        linux-samsung-soc@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ARM: dts: exynos: Add CLK_ACLK432_SCALER clock to
 gsc_pd for Exynos5800

Hello,

On 01/19/2017 07:29 PM, Javier Martinez Canillas wrote:
> On Exynos5800 SoC the SCALER block uses 2 input clocks: CLK_ACLK_300_GSCL
> and CLK_ACLK432_SCALER, so both needs to be ungated in order to access it.
> 
> The SoC manual say the CLK_ACLK432_SCALER is needed to access the internal
> buses, so add this clock as another asynchronous bridges (ASB) clock.
> 
> The Exynos5420 only has the CLK_ACLK_300_GSCL clock defined. So just using
> this definition from exynos5420.dtsi in Exynos5800 leads to the following:
> 

Please ignore this patch as suggested by Marek. Instead I'll post a patch
to mark the clock as CLK_IS_CRITICAL, as a temporary workaround until a
proper runtime PM based solution gets merged.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America