linux-kernel - Re: [PATCH 2/2] ARM: dts: exynos3250: Add assigned clock parents to CMU node

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Message-ID: <5508460A.7030608@kernel.org>
Date:	Wed, 18 Mar 2015 00:19:38 +0900
From:	Kukjin Kim <kgene@...nel.org>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
CC:	Beata Michalska <b.michalska@...sung.com>, kgene@...nel.org,
	tomasz.figa@...il.com, mturquette@...aro.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, cw00.choi@...sung.com,
	kyungmin.park@...sung.com, sw0312.kim@...sung.com
Subject: Re: [PATCH 2/2] ARM: dts: exynos3250: Add assigned clock parents
 to CMU node

On 03/17/15 19:53, Sylwester Nawrocki wrote:
> On 02/03/15 14:17, Beata Michalska wrote:
>> Use assigned-clocks/assigned-clock-parents properties for
>> CMU clock controller DT node to secure proper clock setup:
>> switching the two muxes to root oscillator clock is not only
>> required for proper powering down the ISP power domain,
>> but it also reduces the risk of accessing the ISP CMU
>> registers while the ISP power domain remains turned off
>> (i.e. through the common clock framework by clk_summary)
>>
>> Signed-off-by: Beata Michalska <b.michalska@...sung.com>
>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> 
> Acked-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> 
> Kukjin, please merge this patch for v4.1. I merged the exynos3250
> CMU ISP driver patch and we will have regression if $subject patch
> is not applied, i.e. reading /sys/kernel/debug/clk/clk_summary
> would cause system hang on exynos3250.
> 
OK, applied.

Thanks,
Kukjin

>> ---
>>  arch/arm/boot/dts/exynos3250.dtsi |    4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
>> index 277b48b..6d6118e 100644
>> --- a/arch/arm/boot/dts/exynos3250.dtsi
>> +++ b/arch/arm/boot/dts/exynos3250.dtsi
>> @@ -172,6 +172,10 @@
>>  			compatible = "samsung,exynos3250-cmu";
>>  			reg = <0x10030000 0x20000>;
>>  			#clock-cells = <1>;
>> +			assigned-clocks = <&cmu CLK_MOUT_ACLK_400_MCUISP_SUB>,
>> +					  <&cmu CLK_MOUT_ACLK_266_SUB>;
>> +			assigned-clock-parents = <&cmu CLK_FIN_PLL>,
>> +						 <&cmu CLK_FIN_PLL>;
>>  		};
>>  
>>  		cmu_dmc: clock-controller@...C0000 {
>>
> 
> Thanks,
> Sylwester
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