On 18-04-19, 08:55, Yangtao Li wrote: > Allwinner Process Voltage Scaling Tables defines the voltage and > frequency value based on the speedbin blown in the efuse combination. > The sunxi-cpufreq-nvmem driver reads the efuse value from the SoC to > provide the OPP framework with required information. > This is used to determine the voltage and frequency value for each > OPP of operating-points-v2 table when it is parsed by the OPP framework. > > The "allwinner,sun50i-h6-operating-points" DT extends the > "operating-points-v2" > with following parameters: > - nvmem-cells (NVMEM area containig the speedbin information) > - opp-microvolt-<name>: voltage in micro Volts. > At runtime, the platform can pick a <name> and matching > opp-microvolt-<name> property. > HW: <name>: > sun50i-h6 speed0 speed1 speed2 > > Signed-off-by: Yangtao Li <tiny.windzz@xxxxxxxxx> > Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx> > --- > just fix a typo: > sun50iw-h6 -> sun50i-h6 > > This patch is [2/2]. > for [1/2]: > https://patchwork.kernel.org/patch/10903381/ You should have used "--in-reply-to" feature to avoid all confusion here. And again, I am waiting for Rob to Ack it. > --- > .../bindings/opp/sun50i-nvmem-cpufreq.txt | 167 ++++++++++++++++++ > 1 file changed, 167 insertions(+) > create mode 100644 Documentation/devicetree/bindings/opp/sun50i-nvmem-cpufreq.txt > > diff --git a/Documentation/devicetree/bindings/opp/sun50i-nvmem-cpufreq.txt b/Documentation/devicetree/bindings/opp/sun50i-nvmem-cpufreq.txt > new file mode 100644 > index 000000000000..7deae57a587b > --- /dev/null > +++ b/Documentation/devicetree/bindings/opp/sun50i-nvmem-cpufreq.txt > @@ -0,0 +1,167 @@ > +Allwinner Technologies, Inc. NVMEM CPUFreq and OPP bindings > +=================================== > + > +For some SoCs, the CPU frequency subset and voltage value of each OPP > +varies based on the silicon variant in use. Allwinner Process Voltage > +Scaling Tables defines the voltage and frequency value based on the > +speedbin blown in the efuse combination. The sun50i-cpufreq-nvmem driver > +reads the efuse value from the SoC to provide the OPP framework with > +required information. > + > +Required properties: > +-------------------- > +In 'cpus' nodes: > +- operating-points-v2: Phandle to the operating-points-v2 table to use. > + > +In 'operating-points-v2' table: > +- compatible: Should be > + - 'allwinner,sun50i-h6-operating-points'. > +- nvmem-cells: A phandle pointing to a nvmem-cells node representing the > + efuse registers that has information about the speedbin > + that is used to select the right frequency/voltage value > + pair. Please refer the for nvmem-cells bindings > + Documentation/devicetree/bindings/nvmem/nvmem.txt and > + also examples below. > + > +In every OPP node: > +- opp-microvolt-<name>: Voltage in micro Volts. > + At runtime, the platform can pick a <name> and > + matching opp-microvolt-<name> property. > + [See: opp.txt] > + HW: <name>: > + sun50i-h6 speed0 speed1 speed2 > + > +Example 1: > +--------- > + > + cpus { > + #address-cells = <1>; > + #size-cells = <0>; > + > + cpu0: cpu@0 { > + compatible = "arm,cortex-a53"; > + device_type = "cpu"; > + reg = <0>; > + enable-method = "psci"; > + clocks = <&ccu CLK_CPUX>; > + clock-latency-ns = <244144>; /* 8 32k periods */ > + operating-points-v2 = <&cpu_opp_table>; > + #cooling-cells = <2>; > + }; > + > + cpu1: cpu@1 { > + compatible = "arm,cortex-a53"; > + device_type = "cpu"; > + reg = <1>; > + enable-method = "psci"; > + clocks = <&ccu CLK_CPUX>; > + clock-latency-ns = <244144>; /* 8 32k periods */ > + operating-points-v2 = <&cpu_opp_table>; > + #cooling-cells = <2>; > + }; > + > + cpu2: cpu@2 { > + compatible = "arm,cortex-a53"; > + device_type = "cpu"; > + reg = <2>; > + enable-method = "psci"; > + clocks = <&ccu CLK_CPUX>; > + clock-latency-ns = <244144>; /* 8 32k periods */ > + operating-points-v2 = <&cpu_opp_table>; > + #cooling-cells = <2>; > + }; > + > + cpu3: cpu@3 { > + compatible = "arm,cortex-a53"; > + device_type = "cpu"; > + reg = <3>; > + enable-method = "psci"; > + clocks = <&ccu CLK_CPUX>; > + clock-latency-ns = <244144>; /* 8 32k periods */ > + operating-points-v2 = <&cpu_opp_table>; > + #cooling-cells = <2>; > + }; > + }; > + > + cpu_opp_table: opp_table { > + compatible = "allwinner,sun50i-h6-operating-points"; > + nvmem-cells = <&speedbin_efuse>; > + opp-shared; > + > + opp@480000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <480000000>; > + > + opp-microvolt-speed0 = <880000>; > + opp-microvolt-speed1 = <820000>; > + opp-microvolt-speed2 = <800000>; > + }; > + > + opp@720000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <720000000>; > + > + opp-microvolt-speed0 = <880000>; > + opp-microvolt-speed1 = <820000>; > + opp-microvolt-speed2 = <800000>; > + }; > + > + opp@816000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <816000000>; > + > + opp-microvolt-speed0 = <880000>; > + opp-microvolt-speed1 = <820000>; > + opp-microvolt-speed2 = <800000>; > + }; > + > + opp@888000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <888000000>; > + > + opp-microvolt-speed0 = <940000>; > + opp-microvolt-speed1 = <820000>; > + opp-microvolt-speed2 = <800000>; > + }; > + > + opp@1080000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <1080000000>; > + > + opp-microvolt-speed0 = <1060000>; > + opp-microvolt-speed1 = <880000>; > + opp-microvolt-speed2 = <840000>; > + }; > + > + opp@1320000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <1320000000>; > + > + opp-microvolt-speed0 = <1160000>; > + opp-microvolt-speed1 = <940000>; > + opp-microvolt-speed2 = <900000>; > + }; > + > + opp@1488000000 { > + clock-latency-ns = <244144>; /* 8 32k periods */ > + opp-hz = /bits/ 64 <1488000000>; > + > + opp-microvolt-speed0 = <1160000>; > + opp-microvolt-speed1 = <1000000>; > + opp-microvolt-speed2 = <960000>; > + }; > + }; > +.... > +soc { > +.... > + sid: sid@3006000 { > + compatible = "allwinner,sun50i-h6-sid"; > + reg = <0x03006000 0x400>; > + #address-cells = <1>; > + #size-cells = <1>; > + .... > + speedbin_efuse: speed@1c { > + reg = <0x1c 4>; > + }; > + }; > +}; > -- > 2.17.0 -- viresh
