Add documentation for bindings used by Exynos3250 Dynamic Voltage and Frequency Scaling (DVFS) driver.
Signed-off-by: Krzysztof Kozlowski <[email protected]> --- .../bindings/arm/samsung/exynos3250-devfreq.txt | 62 ++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/samsung/exynos3250-devfreq.txt diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos3250-devfreq.txt b/Documentation/devicetree/bindings/arm/samsung/exynos3250-devfreq.txt new file mode 100644 index 000000000000..162498ec0da8 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/samsung/exynos3250-devfreq.txt @@ -0,0 +1,62 @@ +Samsung Exynos3250 bus frequency scaling driver +=============================================== + +The Exynos3250 SoC allows Dynamic Voltage and Frequency Scaling (DVFS) +for certain system buses: + - memory controller and bus, + - peripheral buses (leftbus, rightbus). + +DVFS for memory controller and bus +================================== +Required properties: + - compatible : should be "samsung,exynos3250-busfreq-mif" + - clock-names : one clock of name "dmc" to manage frequency + - clocks : phandle and specifier for clock listed in clock-names property + - vdd-mif-supply : phandle to MIF voltage regulator + - devfreq-events : two phandles to devfreq event devices providing + raw data for bus utilization + +DVFS for peripheral buses +========================= +Required properties: + - compatible : should be "samsung,exynos3250-busfreq-int" + - clock-names : names for bus clocks to manage frequencies; + All following clock names (and corresponding phandles) must be + provided: "aclk_400", "aclk_266", "aclk_200", "aclk_160", "aclk_gdl", + "aclk_gdr", "mfc"; + - clocks : phandles and specifiers for clocks listed in clock-names property + - vdd-int-supply : phandle to INT voltage regulator + - devfreq-events : two phandles to devfreq event devices providing + raw data for bus utilization + +Example +======= + busfreq_mif: busfreq@106A0000 { + compatible = "samsung,exynos3250-busfreq-mif"; + clocks = <&cmu_dmc CLK_DIV_DMC>; + clock-names = "dmc"; + vdd-mif-supply = <&buck1_reg>; + devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>; + status = "okay"; + }; + + busfreq_int: busfreq@116A0000 { + compatible = "samsung,exynos3250-busfreq-int"; + clocks = <&cmu CLK_DIV_ACLK_400_MCUISP>, + <&cmu CLK_DIV_ACLK_266>, + <&cmu CLK_DIV_ACLK_200>, + <&cmu CLK_DIV_ACLK_160>, + <&cmu CLK_DIV_GDL>, + <&cmu CLK_DIV_GDR>, + <&cmu CLK_DIV_MFC>; + clock-names = "aclk_400", + "aclk_266", + "aclk_200", + "aclk_160", + "aclk_gdl", + "aclk_gdr", + "mfc"; + vdd-int-supply = <&buck3_reg>; + devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>; + status = "okay"; + }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
