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Groups > linux.kernel > #1287605
| From | Lee Jones <lee.jones@linaro.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v6 09/10] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation |
| Date | 2015-12-09 17:00 +0100 |
| Message-ID | <qDPjS-1RQ-57@gated-at.bofh.it> (permalink) |
| References | <qDPjP-1RQ-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Cc: devicetree@vger.kernel.org
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
.../devicetree/bindings/cpufreq/cpufreq-st.txt | 91 ++++++++++++++++++++++
1 file changed, 91 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..d91a02a
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-st.txt
@@ -0,0 +1,91 @@
+Binding for ST's CPUFreq driver
+===============================
+
+ST's CPUFreq driver attempts to read 'process' and 'version' attributes
+from the SoC, then supplies the OPP framework with 'prop' and 'supported
+hardware' information respectively. The framework is then able to read
+the DT and operate in the usual way.
+
+For more information about the expected DT format [See: ../opp/opp.txt].
+
+Frequency Scaling only
+----------------------
+
+No vendor specific driver required for this.
+
+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>;
+ };
+};
+
+Dynamic Voltage and Frequency Scaling (DVFS)
+--------------------------------------------
+
+This requires the ST CPUFreq driver to supply 'process' and 'version' info.
+
+Located in CPU's node:
+
+- operating-points-v2 : [See ../power/opp.txt]
+
+Example [unsafe]
+----------------
+
+cpus {
+ cpu@0 {
+ operating-points-v2 = <&cpu0_opp_table>;
+ };
+};
+
+cpu0_opp_table: opp_table {
+ compatible = "operating-points-v2";
+
+ /* ############################################################### */
+ /* # WARNING: Do not attempt to copy/replicate these nodes, # */
+ /* # they are only to be supplied by the bootloader !!! # */
+ /* ############################################################### */
+ opp0 {
+ /* Major Minor Substrate */
+ /* 2 all all */
+ opp-supported-hw = <0x00000004 0xffffffff 0xffffffff>;
+ opp-hz = /bits/ 64 <1500000000>;
+ clock-latency-ns = <10000000>;
+
+ opp-microvolt-pcode0 = <1200000>;
+ opp-microvolt-pcode1 = <1200000>;
+ opp-microvolt-pcode2 = <1200000>;
+ opp-microvolt-pcode3 = <1200000>;
+ opp-microvolt-pcode4 = <1170000>;
+ opp-microvolt-pcode5 = <1140000>;
+ opp-microvolt-pcode6 = <1100000>;
+ opp-microvolt-pcode7 = <1070000>;
+ };
+
+ opp1 {
+ /* Major Minor Substrate */
+ /* all all all */
+ opp-supported-hw = <0xffffffff 0xffffffff 0xffffffff>;
+ opp-hz = /bits/ 64 <1200000000>;
+ clock-latency-ns = <10000000>;
+
+ opp-microvolt-pcode0 = <1110000>;
+ opp-microvolt-pcode1 = <1150000>;
+ opp-microvolt-pcode2 = <1100000>;
+ opp-microvolt-pcode3 = <1080000>;
+ opp-microvolt-pcode4 = <1040000>;
+ opp-microvolt-pcode5 = <1020000>;
+ opp-microvolt-pcode6 = <980000>;
+ opp-microvolt-pcode7 = <930000>;
+ };
+};
--
1.9.1
--
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[PATCH v6 00/10] cpufreq: Introduce ST's CPUFreq driver Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
[PATCH v6 05/10] ARM: STi: STiH407: Provide CPU with clocking information Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
[PATCH v6 10/10] MAINTAINERS: Add ST's CPUFreq driver to the STI file list Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
[PATCH v6 07/10] ARM: STi: STiH407: Provide CPU with a means to look-up Major number Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
[PATCH v6 03/10] ARM: multi_v7_defconfig: Enable support for PWM Regulators Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
[PATCH v6 08/10] cpufreq: st: Provide runtime initialised driver for ST's platforms Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
Re: [PATCH v6 08/10] cpufreq: st: Provide runtime initialised driver for ST's platforms Viresh Kumar <viresh.kumar@linaro.org> - 2015-12-10 03:10 +0100
Re: [PATCH v6 08/10] cpufreq: st: Provide runtime initialised driver for ST's platforms Lee Jones <lee.jones@linaro.org> - 2015-12-10 09:30 +0100
[PATCH v6.1 08/10] cpufreq: st: Provide runtime initialised driver for ST's platforms Lee Jones <lee.jones@linaro.org> - 2015-12-10 10:20 +0100
Re: [PATCH v6.1 08/10] cpufreq: st: Provide runtime initialised driver for ST's platforms Viresh Kumar <viresh.kumar@linaro.org> - 2015-12-10 10:30 +0100
[PATCH v6 09/10] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:00 +0100
[PATCH v6 06/10] ARM: STi: STiH407: Link CPU with its voltage supply Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:10 +0100
[PATCH v6 04/10] ARM: STi: STiH407: Provide generic (safe) DVFS configuration Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:10 +0100
[PATCH v6 01/10] ARM: multi_v7_defconfig: Enable ST's PWM driver Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:10 +0100
[PATCH v6 02/10] ARM: multi_v7_defconfig: Enable ST's Power Reset driver Lee Jones <lee.jones@linaro.org> - 2015-12-09 17:10 +0100
Re: [PATCH v6 00/10] cpufreq: Introduce ST's CPUFreq driver Viresh Kumar <viresh.kumar@linaro.org> - 2015-12-10 03:20 +0100
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