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[81.129.169.163]) by mx.google.com with ESMTPSA id q2sm40833925wjz.15.2015.06.24.06.59.27 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 24 Jun 2015 06:59:27 -0700 (PDT) From: Lee Jones 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 Subject: [PATCH v2 8/9] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation Date: Wed, 24 Jun 2015 14:59:07 +0100 Message-Id: <1435154348-28840-9-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1435154348-28840-1-git-send-email-lee.jones@linaro.org> References: <1435154348-28840-1-git-send-email-lee.jones@linaro.org> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Cc: devicetree@vger.kernel.org Signed-off-by: Lee Jones --- .../devicetree/bindings/cpufreq/cpufreq-st.txt | 72 ++++++++++++++++++++++ 1 file changed, 72 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..e871a9f --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt @@ -0,0 +1,72 @@ +Binding for ST's CPUFreq driver +=============================== + +Required properties [for working voltage scaling]: +------------------------------------------------- + +Located in CPU'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 +- 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 [safe]: +-------------- + +cpus { + cpu@0 { + /* kHz uV */ + operating-points = <1500000 0 + 1200000 0 + 800000 0 + 500000 0>; + }; +}; + +Example [unsafe]: +---------------- + +cpus { + cpu@0 { + st,syscfg = <&syscfg [major_offset]>; + st,syscfg-eng = <&syscfg_eng [pcode_offset] [minor_offset]>; + + /* ########################################################### */ + /* # WARNING: Do not attempt to copy/replicate this node !!! # */ + /* ########################################################### */ + st,opp-list { + opp0 { + st,avs = <1110 1150 1100 1080 1040 1020 980 930>; + st,freq = <1200000>; + st,substrate = <0xff>; + st,cuts = <0xff>; + }; + opp1 { + st,avs = <1200 1200 1200 1200 1170 1140 1100 1070>; + st,freq = <1500000>; + st,substrate = <0xff>; + st,cuts = <0x2>; + }; + }; + }; +};