From mboxrd@z Thu Jan 1 00:00:00 1970 From: b20788@freescale.com (Anson Huang) Date: Thu, 19 Dec 2013 09:16:49 -0500 Subject: [PATCH V4 3/3] cpufreq: imx6: Add device tree binding document In-Reply-To: <1387462609-13013-1-git-send-email-b20788@freescale.com> References: <1387462609-13013-1-git-send-email-b20788@freescale.com> Message-ID: <1387462609-13013-3-git-send-email-b20788@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This device tree binding document describes the imx6 cpufreq DT bindings. This document lists all required and optional properties for imx6 cpufreq. Signed-off-by: Anson Huang --- .../devicetree/bindings/cpufreq/cpufreq-imx6.txt | 56 ++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-imx6.txt diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-imx6.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-imx6.txt new file mode 100644 index 0000000..a14b895 --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-imx6.txt @@ -0,0 +1,56 @@ +i.MX6 cpufreq driver +------------------- + +i.MX6 SoC cpufreq driver for CPU frequency scaling. + +This binding doc defines properties that must be put in the /cpus/cpu at 0 node, +please refer to Documentation/devicetree/bindings/cpufreq/cpufreq-cpu0.txt +for detail. + +Required properties: +- operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt + for details. +- clocks: Specify clocks that need to be used when cpu frequency is scaled, + refer to Documentation/devicetree/bindings/clock/clock-bindings.txt for + details. +- clock-names: List of clock input name strings sorted in the same order as the + clocks property, refer to Documentation/devicetree/bindings/clock/clock-bindings.txt + for details. +- xxx-supply: Input voltage supply regulator, refer to + Documentation/devicetree/bindings/regulator/regulator.txt for details. + arm-supply: regulator node supplying arm. + pu-supply: regulator node supplying pu. + soc-supply: regulator node supplying soc. + +Optional properties: +- fsl,soc-operating-points: Specify vddsoc/pu voltage settings that must + go with cpu0's operating-points. +- clock-latency: Specify the possible maximum transition latency for clock, + in unit of nanoseconds. + +Examples: + + cpu at 0 { + operating-points = < + /* kHz uV */ + 1200000 1275000 + 996000 1250000 + 792000 1150000 + 396000 975000 + >; + fsl,soc-operating-points = < + /* ARM kHz SOC-PU uV */ + 1200000 1275000 + 996000 1250000 + 792000 1175000 + 396000 1175000 + >; + clock-latency = <61036>; /* two CLK32 periods */ + clocks = <&clks 104>, <&clks 6>, <&clks 16>, + <&clks 17>, <&clks 170>; + clock-names = "arm", "pll2_pfd2_396m", "step", + "pll1_sw", "pll1_sys"; + arm-supply = <®_arm>; + pu-supply = <®_pu>; + soc-supply = <®_soc>; + }; -- 1.7.9.5