The patch adds description for DT binding for a new Exynos5 Dynamic Memory Controller device. It also contains needed MAINTAINERS file updates.
CC: MyungJoo Ham <[email protected]> CC: Kyungmin Park <[email protected]> CC: Chanwoo Choi <[email protected]> CC: Rob Herring <[email protected]> CC: Mark Rutland <[email protected]> CC: Kukjin Kim <[email protected]> CC: Krzysztof Kozlowski <[email protected]> CC: [email protected] CC: [email protected] CC: [email protected] CC: [email protected] CC: [email protected] Signed-off-by: Lukasz Luba <[email protected]> --- .../devicetree/bindings/devfreq/exynos5-dmc.txt | 108 +++++++++++++++++++++ MAINTAINERS | 7 ++ 2 files changed, 115 insertions(+) create mode 100644 Documentation/devicetree/bindings/devfreq/exynos5-dmc.txt diff --git a/Documentation/devicetree/bindings/devfreq/exynos5-dmc.txt b/Documentation/devicetree/bindings/devfreq/exynos5-dmc.txt new file mode 100644 index 0000000..914bd85 --- /dev/null +++ b/Documentation/devicetree/bindings/devfreq/exynos5-dmc.txt @@ -0,0 +1,108 @@ +* Exynos5 frequency and voltage scaling for Dynamic Memory Controller device + +The Samsung Exynos5 SoC has DMC (Dynamic Memory Controller) to which the DRAM +memory chips are connected. The driver is to monitor the controller in runtime +and switch frequency and voltage. To monitor the usage of the controller in +runtime, the driver uses the PPMU (Platform Performance Monitoring Unit), which +is able to measure the current load of the memory. +When 'userspace' governor is used for the driver, an application is able to +switch the DMC frequency. + +Required properties for DMC device for Exynos5422: +- compatible: Should be "samsung,exynos5422-bus". +- clock-names : the name of clock used by the bus, "bus". +- clocks : phandles for clock specified in "clock-names" property. +- devfreq-events : phandles for PPMU devices connected to this DMC. + +The example definition of a DMC and PPMU devices declared in DT is shown below: + + ppmu_dmc0_0: ppmu_dmc0_0@10d00000 { + compatible = "samsung,exynos-ppmu"; + reg = <0x10d00000 0x2000>; + clocks = <&clock CLK_PCLK_PPMU_DREX0_0>; + clock-names = "ppmu"; + status = "okay"; + events { + ppmu_event_dmc0_0: ppmu-event3-dmc0_0 { + event-name = "ppmu-event3-dmc0_0"; + }; + }; + }; + + + ppmu_dmc0_1: ppmu_dmc0_1@10d10000 { + compatible = "samsung,exynos-ppmu"; + reg = <0x10d10000 0x2000>; + clocks = <&clock CLK_PCLK_PPMU_DREX0_1>; + clock-names = "ppmu"; + status = "okay"; + events { + ppmu_event_dmc0_1: ppmu-event3-dmc0_1 { + event-name = "ppmu-event3-dmc0_1"; + }; + }; + }; + + ppmu_dmc1_0: ppmu_dmc1_0@10d10000 { + compatible = "samsung,exynos-ppmu"; + reg = <0x10d60000 0x2000>; + clocks = <&clock CLK_PCLK_PPMU_DREX1_0>; + clock-names = "ppmu"; + status = "okay"; + events { + ppmu_event_dmc1_0: ppmu-event3-dmc1_0 { + event-name = "ppmu-event3-dmc1_0"; + }; + }; + }; + + ppmu_dmc1_1: ppmu_dmc1_1@10d70000 { + compatible = "samsung,exynos-ppmu"; + reg = <0x10d70000 0x2000>; + clocks = <&clock CLK_PCLK_PPMU_DREX1_1>; + clock-names = "ppmu"; + status = "okay"; + events { + ppmu_event_dmc1_1: ppmu-event3-dmc1_1 { + event-name = "ppmu-event3-dmc1_1"; + }; + }; + }; + + dmc: dmc@10c20000 { + compatible = "samsung,exynos5422-dmc"; + reg = <0x10c20000 0x10000>, <0x10c30000 0x10000>, + <0x10030000 0x1000>, <0x10000000 0x1000>; + clocks = <&clock CLK_FOUT_SPLL>, + <&clock CLK_MOUT_SCLK_SPLL>, + <&clock CLK_FF_DOUT_SPLL2>, + <&clock CLK_FOUT_BPLL>, + <&clock CLK_MOUT_BPLL>, + <&clock CLK_SCLK_BPLL>, + <&clock CLK_MOUT_MX_MSPLL_CCORE>, + <&clock CLK_MOUT_MX_MSPLL_CCORE_PHY>, + <&clock CLK_MOUT_MCLK_CDREX>, + <&clock CLK_DOUT_CLK2X_PHY0>, + <&clock CLK_CLKM_PHY0>, + <&clock CLK_CLKM_PHY1> + ; + clock-names = "fout_spll", + "mout_sclk_spll", + "ff_dout_spll2", + "fout_bpll", + "mout_bpll", + "sclk_bpll", + "mout_mx_mspll_ccore", + "mout_mx_mspll_ccore_phy", + "mout_mclk_cdrex", + "dout_clk2x_phy0", + "clkm_phy0", + "clkm_phy1" + ; + + status = "okay"; + devfreq-events = <&ppmu_dmc0_0>, <&ppmu_dmc0_1>, + <&ppmu_dmc1_0>, <&ppmu_dmc1_1>; + }; + + diff --git a/MAINTAINERS b/MAINTAINERS index 9f64f8d..3581807 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3310,6 +3310,13 @@ S: Maintained F: drivers/devfreq/exynos-bus.c F: Documentation/devicetree/bindings/devfreq/exynos-bus.txt +DMC FREQUENCY DRIVER FOR SAMSUNG EXYNOS5 +M: Lukasz Luba <[email protected]> +L: [email protected] +L: [email protected] +S: Maintained +F: Documentation/devicetree/bindings/devfreq/exynos5-dmc.txt + BUSLOGIC SCSI DRIVER M: Khalid Aziz <[email protected]> L: [email protected] -- 2.7.4
