From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: [PATCH 8/8] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation Date: Mon, 22 Jun 2015 16:43:57 +0100 Message-ID: <1434987837-24212-9-git-send-email-lee.jones@linaro.org> References: <1434987837-24212-1-git-send-email-lee.jones@linaro.org> Return-path: In-Reply-To: <1434987837-24212-1-git-send-email-lee.jones@linaro.org> Sender: linux-pm-owner@vger.kernel.org To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: kernel@stlinux.com, rjw@rjwysocki.net, viresh.kumar@linaro.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, ajitpal.singh@st.com, Lee Jones List-Id: devicetree@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Lee Jones --- .../devicetree/bindings/cpufreq/cpufreq-st.txt | 48 ++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt new file mode 100644 index 0000000..cfa8952 --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt @@ -0,0 +1,48 @@ +Binding for ST's CPUFreq driver +=============================== + +Required properties: +------------------- +- compatible : Supported values are: + "st,stih407-cpufreq" + +Required properties [for working voltage scaling]: +------------------------------------------------- + +Located in CPUFreq's node: + +- st,syscfg : Phandle to Major number register + First cell: offset to major number +- st,syscfg-eng : Phandle to Minor number and Pcode registers + First cell: offset to process code + Second cell: offset to minor number + +Located in CPU's node: + +- st,opp-list : Bootloader provided node containing one or more 'opp@X' sub-nodes + - opp@{1..X} : Each 'opp@X' subnode will contain the following properties: + - st,avs : List of available voltages [uV] indexed by process code + - st,freq : CPU frequency [Hz] for this OPP + - st,cuts : Cut version this OPP is suitable for [0xFF means ALL] + - st,substrate : Substrate version this OPP is suitable for [0xFF means ALL] + +WARNING: The st,opp-list will be provided by the bootloader. Do not attempt to + artificially synthesise the st,opp-list node or any of its descendants. + They are very platform specific and may damage the hardware if created + incorrectly. + +Required properties [if the voltage scaling properties are missing]: +------------------------------------------------------------------- + +Located in CPU's node: + +- operating-points : [See: ../power/opp.txt] + +Example: +------- + +cpufreq { + compatible = "st,stih407-cpufreq"; + st,syscfg = <&syscfg [major_offset]>; + st,syscfg-eng = <&syscfg_eng [pcode_offset] [minor_offset]>; +}; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in