From 5cb8f01ef047ea52ec1acc11c71702cb65622c86 Mon Sep 17 00:00:00 2001 From: Gaku Inami Date: Tue, 3 Jun 2014 21:03:10 +0900 Subject: [PATCH] ARM: shmobile: r8a7791/koelsch dts: Add DVFS parameters into cpu0 node for r8a7791 Add needed information inside CPU0 for the generic cpufreq-cpu0 driver. - voltage-tolerance = 1% It reflects the tolerance for the CPU voltage defined inside the OPP table. Due to the lack of proper OPP definition, use an arbitrary safe value. - clock-latency = 300 us Approximate worst-case latency to do a full DVFS transition for every OPPs. Due to the lack of HW information, use an arbitrary safe value. Note: The term transition-latency will be more accurate to define this value since the clock transition latency is not the only parameter that will define the overall DVFS transition. - operating-points = < kHz - uV > List of 6 operating points. All of them are using the same voltage since DVS is not supported in R-CAR Gen2. - clocks phandle to the CPU clock source. This clock source is used for all the 2 CortexA15 located inside the same cluster. Signed-off-by: Gaku Inami Acked-by: Magnus Damm Signed-off-by: Simon Horman (cherry picked from commit a57004eca542428a444025847098b2af4e52a81c) Signed-off-by: Simon Horman --- arch/arm/boot/dts/r8a7791-koelsch.dts | 4 ++++ arch/arm/boot/dts/r8a7791.dtsi | 11 +++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm/boot/dts/r8a7791-koelsch.dts b/arch/arm/boot/dts/r8a7791-koelsch.dts index 95331d7..b2e6616 100644 --- a/arch/arm/boot/dts/r8a7791-koelsch.dts +++ b/arch/arm/boot/dts/r8a7791-koelsch.dts @@ -429,3 +429,7 @@ regulator-always-on; }; }; + +&cpu0 { + cpu0-supply = <&vdd_dvfs>; +}; diff --git a/arch/arm/boot/dts/r8a7791.dtsi b/arch/arm/boot/dts/r8a7791.dtsi index 15dc67e..76150f1 100644 --- a/arch/arm/boot/dts/r8a7791.dtsi +++ b/arch/arm/boot/dts/r8a7791.dtsi @@ -45,6 +45,17 @@ compatible = "arm,cortex-a15"; reg = <0>; clock-frequency = <1500000000>; + voltage-tolerance = <1>; /* 1% */ + clocks = <&cpg_clocks R8A7791_CLK_Z>; + clock-latency = <300000>; /* 300 us */ + + /* kHz - uV - OPPs unknown yet */ + operating-points = <1500000 1000000>, + <1312500 1000000>, + <1125000 1000000>, + < 937500 1000000>, + < 750000 1000000>, + < 375000 1000000>; }; cpu1: cpu@1 { -- 2.7.4