[PATCH v2 6/8] ARM: shmobile: r8a7791/koelsch dts: Add DVFS parameters into cpu0 node for r8a7791

[PATCH v2 6/8] ARM: shmobile: r8a7791/koelsch dts: Add DVFS parameters into cpu0 node for r8a7791

[Gaku Inami]

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 <gaku.inami.xw@bp.renesas.com>
---

Changes since version 1:
- added the setting of VDD.
- fixed subject.

 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 8d7ffae..b9b3c74 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 {
-- 
1.7.9.5

Re: [PATCH v2 6/8] ARM: shmobile: r8a7791/koelsch dts: Add DVFS parameters into cpu0 node for r8a779

[Simon Horman]

On Tue, Jun 03, 2014 at 09:03:10PM +0900, Gaku Inami wrote:
> 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 <gaku.inami.xw@bp.renesas.com>

Thanks, I have queued this up with Magnus's ack.

> ---
> 
> Changes since version 1:
> - added the setting of VDD.
> - fixed subject.
> 
>  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 8d7ffae..b9b3c74 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 {
> -- 
> 1.7.9.5
>