linux-kernel - Re: [PATCH v2 12/19] ARM: dts: Add bus nodes using VDD

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Date:	Thu, 10 Dec 2015 11:30:20 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	myungjoo.ham@...sung.com, kgene@...nel.org
Cc:	kyungmin.park@...sung.com, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linux@....linux.org.uk,
	tjakobi@...h.uni-bielefeld.de, linux.amoon@...il.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 12/19] ARM: dts: Add bus nodes using VDD_INT for
 Exynos3250

On 2015년 12월 10일 11:09, Krzysztof Kozlowski wrote:
> On 09.12.2015 13:08, Chanwoo Choi wrote:
>> This patch adds the bus nodes using VDD_INT for Exynos3250 SoC.
>> Exynos3250 has following AXI buses to translate data between
>> DRAM and sub-blocks.
>>
>> Following list specifies the detailed relation between DRAM and sub-blocks:
>> - ACLK400 clock for MCUISP
>> - ACLK266 clock for ISP
>> - ACLK200 clock for FSYS
>> - ACLK160 clock for LCD0
>> - ACLK100 clock for PERIL
>> - GDL clock for LEFTBUS
>> - GDR clock for RIGHTBUS
>> - SCLK_MFC clock for MFC
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>>  arch/arm/boot/dts/exynos3250.dtsi | 160 ++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 160 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
>> index 7214c5e42150..46dee1951ec1 100644
>> --- a/arch/arm/boot/dts/exynos3250.dtsi
>> +++ b/arch/arm/boot/dts/exynos3250.dtsi
>> @@ -721,6 +721,166 @@
>>  				opp-microvolt = <875000>;
>>  			};
>>  		};
>> +
>> +		bus_leftbus: bus_leftbus {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_GDL>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_leftbus_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_rightbus: bus_rightbus {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_GDR>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_leftbus_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_lcd0: bus_lcd0 {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_ACLK_160>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_leftbus_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_fsys: bus_fsys {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_ACLK_200>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_leftbus_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_mcuisp: bus_mcuisp {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_ACLK_400_MCUISP>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_mcuisp_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_isp: bus_isp {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_ACLK_266>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_isp_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_peril: bus_peril {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_DIV_ACLK_100>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_peril_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_mfc: bus_mfc {
>> +			compatible = "samsung,exynos-bus";
>> +			clocks = <&cmu CLK_SCLK_MFC>;
>> +			clock-names = "bus";
>> +			operating-points-v2 = <&bus_leftbus_opp_table>;
>> +			status = "disabled";
>> +		};
>> +
>> +		bus_leftbus_opp_table: opp_table2 {
>> +			compatible = "operating-points-v2";
>> +			opp-shared;
>> +
>> +			opp00 {
>> +				opp-hz = /bits/ 64 <50000000>;
>> +				opp-microvolt = <900000>;
>> +			};
>> +			opp01 {
>> +				opp-hz = /bits/ 64 <80000000>;
>> +				opp-microvolt = <900000>;
>> +			};
>> +			opp02 {
>> +				opp-hz = /bits/ 64 <100000000>;
>> +				opp-microvolt = <1000000>;
>> +			};
>> +			opp03 {
>> +				opp-hz = /bits/ 64 <134000000>;
>> +				opp-microvolt = <1000000>;
>> +			};
>> +			opp04 {
>> +				opp-hz = /bits/ 64 <200000000>;
>> +				opp-microvolt = <1000000>;
>> +			};
>> +		};
>> +
>> +		bus_mcuisp_opp_table: opp_table3 {
>> +			compatible = "operating-points-v2";
>> +			opp-shared;
>> +
>> +			opp00 {
>> +				opp-hz = /bits/ 64 <50000000>;
>> +				opp-microvolt = <900000>;
> 
> The voltages for all these INT-block tables have exactly the same value
> which of course makes sense because this is the same regulator. However
> the opp-microvolt property is an optional property. Do you have to
> provide it in each OPP?

I couldn't check whether opp-microvolt property is optional or not.
You're right. Except for the opp-microvolt property of parent device,
I'll remove it on dts file.

Best Regards,
Chanwoo Choi

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