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Date: Thu, 10 Dec 2015 10:36:48 +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 09/19] PM / devfreq: exynos: Update documentation for
bus devices using passive governor
On 2015년 12월 10일 10:31, Krzysztof Kozlowski wrote:
> On 09.12.2015 13:08, Chanwoo Choi wrote:
>> This patch updates the documentation for passive bus devices and adds the
>> detailed example of Exynos3250.
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>> .../devicetree/bindings/devfreq/exynos-bus.txt | 244 ++++++++++++++++++++-
>> 1 file changed, 241 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
>> index 54a1f9c46c88..c4fdc70f8eac 100644
>> --- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
>> +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt
>> @@ -13,18 +13,23 @@ SoC has the different sub-blocks. So, this difference should be specified
>> in devicetree file instead of each device driver. In result, this driver
>> is able to support the bus frequency for all Exynos SoCs.
>>
>> -Required properties for bus device:
>> +Required properties for all bus devices:
>> - compatible: Should be "samsung,exynos-bus".
>> - clock-names : the name of clock used by the bus, "bus".
>> - clocks : phandles for clock specified in "clock-names" property.
>> - #clock-cells: should be 1.
>> - operating-points-v2: the OPP table including frequency/voltage information
>> to support DVFS (Dynamic Voltage/Frequency Scaling) feature.
>> +
>> +Required properties for only parent bus device:
>
> Maybe:
> "Required properties only for parent bus devices:"
OK. I'll modify it.
>
> In this binding documentation file the idea of "parent" is not
> explained. I now it is related to passive devfreq governor but looking
> at the binding itself it is a new idea, not covered here.
OK. I'll add the detailed description of 'parent' and
correlation between 'parent' and 'passive' device.
>
>> - vdd-supply: the regulator to provide the buses with the voltage.
>> - devfreq-events: the devfreq-event device to monitor the curret utilization
>> of buses.
>>
>> -Optional properties for bus device:
>> +Required properties for only passive bus device:
>
> "Required properties only for passive bus devices:"
OK. I'll modify it.
>
>> +- devfreq: the parent bus device.
>> +
>> +Optional properties for only parent bus device:
>> - exynos,saturation-ratio: the percentage value which is used to calibrate
>> the performance count againt total cycle count.
>>
>> @@ -33,7 +38,20 @@ Example1:
>> power line (regulator). The MIF (Memory Interface) AXI bus is used to
>> transfer data between DRAM and CPU and uses the VDD_MIF regualtor.
>>
>> - - power line(VDD_MIF) --> bus for DMC (Dynamic Memory Controller) block
>> + - MIF (Memory Interface) block
>> + : VDD_MIF |--- DMC (Dynamic Memory Controller)
>> +
>> + - INT (Internal) block
>> + : VDD_INT |--- LEFTBUS (parent device)
>> + |--- PERIL
>> + |--- MFC
>> + |--- G3D
>> + |--- RIGHTBUS
>> + |--- FSYS
>> + |--- LCD0
>> + |--- PERIR
>> + |--- ISP
>> + |--- CAM
>>
>> - MIF bus's frequency/voltage table
>> -----------------------
>> @@ -46,6 +64,24 @@ Example1:
>> |L5| 400000 |875000 |
>> -----------------------
>>
>> + - INT bus's frequency/voltage table
>> + ----------------------------------------------------------
>> + |Block|LEFTBUS|RIGHTBUS|MCUISP |ISP |PERIL ||VDD_INT |
>> + | name| |LCD0 | | | || |
>> + | | |FSYS | | | || |
>> + | | |MFC | | | || |
>> + ----------------------------------------------------------
>> + |Mode |*parent|passive |passive|passive|passive|| |
>> + ----------------------------------------------------------
>> + |Lv |Frequency ||Voltage |
>> + ----------------------------------------------------------
>> + |L1 |50000 |50000 |50000 |50000 |50000 ||900000 |
>> + |L2 |80000 |80000 |80000 |80000 |80000 ||900000 |
>> + |L3 |100000 |100000 |100000 |100000 |100000 ||1000000 |
>> + |L4 |134000 |134000 |200000 |200000 | ||1000000 |
>> + |L5 |200000 |200000 |400000 |300000 | ||1000000 |
>> + ----------------------------------------------------------
>> +
>> Example2 :
>> The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi
>> are listed below:
>> @@ -84,6 +120,167 @@ Example2 :
>> };
>> };
>>
>> + 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_perir {
>
>
> Peril or perir?
peril is correct. I'll fix it.
Best Regards,
Chanwoo Choi
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