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| Started by | Lee Jones <lee.jones@linaro.org> |
|---|---|
| First post | 2015-12-08 15:40 +0100 |
| Last post | 2015-12-09 05:00 +0100 |
| Articles | 2 — 2 participants |
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[PATCH v5 10/11] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation Lee Jones <lee.jones@linaro.org> - 2015-12-08 15:40 +0100
Re: [PATCH v5 10/11] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation Rob Herring <robh@kernel.org> - 2015-12-09 05:00 +0100
| From | Lee Jones <lee.jones@linaro.org> |
|---|---|
| Date | 2015-12-08 15:40 +0100 |
| Subject | [PATCH v5 10/11] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation |
| Message-ID | <qDrAR-3yq-1@gated-at.bofh.it> |
Cc: devicetree@vger.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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| From | Rob Herring <robh@kernel.org> |
|---|---|
| Date | 2015-12-09 05:00 +0100 |
| Subject | Re: [PATCH v5 10/11] dt: cpufreq: st: Provide bindings for ST's CPUFreq implementation |
| Message-ID | <qDE54-314-3@gated-at.bofh.it> |
| In reply to | #1286527 |
On Tue, Dec 08, 2015 at 02:32:03PM +0000, Lee Jones wrote:
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Rob Herring <robh@kernel.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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