linux-kernel - Re: [PATCH v6 1/4] dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings

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Message-ID: <20150709145551.9112.35610@quantum>
Date:	Thu, 09 Jul 2015 07:55:51 -0700
From:	Michael Turquette <mturquette@...libre.com>
To:	Pi-Cheng Chen <pi-cheng.chen@...aro.org>,
	"Viresh Kumar" <viresh.kumar@...aro.org>,
	"Matthias Brugger" <matthias.bgg@...il.com>,
	"Mark Rutland" <mark.rutland@....com>
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v6 1/4] dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings

Quoting Pi-Cheng Chen (2015-07-09 03:27:38)
> This patch adds the clock and regulator consumer properties part of
> document for CPU DVFS clocks on Mediatek MT8173 SoC.
> 
> Signed-off-by: Pi-Cheng Chen <pi-cheng.chen@...aro.org>

Acked-by: Michael Turquette <mturquette@...libre.com>

Regards,
Mike

> ---
>  .../devicetree/bindings/clock/mt8173-cpu-dvfs.txt  | 83 ++++++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt b/Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt
> new file mode 100644
> index 0000000..27b3521
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt
> @@ -0,0 +1,83 @@
> +Device Tree Clock bindings for CPU DVFS clock of Mediatek MT8173 SoC
> +
> +Required properties:
> +- clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock names.
> +- clock-names: Should contain the following:
> +       "cpu"           - The multiplexer for clock input of CPU cluster.
> +       "intermediate"  - A parent of "cpu" clock which is used as "intermediate" clock
> +                         source (usually MAINPLL) when the original CPU PLL is under
> +                         transition and not stable yet.
> +       Please refer to Documentation/devicetree/bindings/clk/clock-bindings.txt for
> +       generic clock consumer properties.
> +- proc-supply: Regulator for Vproc of CPU cluster.
> +
> +Optional properties:
> +- sram-supply: Regulator for Vsram of CPU cluster. When present, the cpufreq driver
> +              needs to do "voltage tracking" to step by step scale up/down Vproc and
> +              Vsram to fit SoC specific needs. When absent, the voltage scaling
> +              flow is handled by hardware, hence no software "voltage tracking" is
> +              needed.
> +
> +Example:
> +--------
> +       cpu0: cpu@0 {
> +               device_type = "cpu";
> +               compatible = "arm,cortex-a53";
> +               reg = <0x000>;
> +               enable-method = "psci";
> +               cpu-idle-states = <&CPU_SLEEP_0>;
> +               clocks = <&infracfg CLK_INFRA_CA53SEL>,
> +                        <&apmixedsys CLK_APMIXED_MAINPLL>;
> +               clock-names = "cpu", "intermediate";
> +       };
> +
> +       cpu1: cpu@1 {
> +               device_type = "cpu";
> +               compatible = "arm,cortex-a53";
> +               reg = <0x001>;
> +               enable-method = "psci";
> +               cpu-idle-states = <&CPU_SLEEP_0>;
> +               clocks = <&infracfg CLK_INFRA_CA53SEL>,
> +                        <&apmixedsys CLK_APMIXED_MAINPLL>;
> +               clock-names = "cpu", "intermediate";
> +       };
> +
> +       cpu2: cpu@100 {
> +               device_type = "cpu";
> +               compatible = "arm,cortex-a57";
> +               reg = <0x100>;
> +               enable-method = "psci";
> +               cpu-idle-states = <&CPU_SLEEP_0>;
> +               clocks = <&infracfg CLK_INFRA_CA57SEL>,
> +                        <&apmixedsys CLK_APMIXED_MAINPLL>;
> +               clock-names = "cpu", "intermediate";
> +       };
> +
> +       cpu3: cpu@101 {
> +               device_type = "cpu";
> +               compatible = "arm,cortex-a57";
> +               reg = <0x101>;
> +               enable-method = "psci";
> +               cpu-idle-states = <&CPU_SLEEP_0>;
> +               clocks = <&infracfg CLK_INFRA_CA57SEL>,
> +                        <&apmixedsys CLK_APMIXED_MAINPLL>;
> +               clock-names = "cpu", "intermediate";
> +       };
> +
> +       &cpu0 {
> +               proc-supply = <&mt6397_vpca15_reg>;
> +       };
> +
> +       &cpu1 {
> +               proc-supply = <&mt6397_vpca15_reg>;
> +       };
> +
> +       &cpu2 {
> +               proc-supply = <&da9211_vcpu_reg>;
> +               sram-supply = <&mt6397_vsramca7_reg>;
> +       };
> +
> +       &cpu3 {
> +               proc-supply = <&da9211_vcpu_reg>;
> +               sram-supply = <&mt6397_vsramca7_reg>;
> +       };
> -- 
> 1.9.1
> 
> --
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