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@xxxxxxxxxxx> >> --- >> .../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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html