| Message ID | 1549039612-28905-6-git-send-email-l.luba@partner.samsung.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Exynos5 Dynamic Memory Controller driver | expand |
Hi, 2019년 2월 2일 (토) 오전 2:45, Lukasz Luba <l.luba@partner.samsung.com>님이 작성: > > The patch adds description for DT binding for a new Exynos5422 Dynamic > Memory Controller device. > It also contains needed MAINTAINERS file update. > > Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com> > --- > .../devicetree/bindings/devfreq/exynos5422-dmc.txt | 106 +++++++++++++++++++++ > MAINTAINERS | 1 + > 2 files changed, 107 insertions(+) > create mode 100644 Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt > > diff --git a/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt > new file mode 100644 > index 0000000..229efba > --- /dev/null > +++ b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt > @@ -0,0 +1,106 @@ > +* Exynos5422 frequency and voltage scaling for Dynamic Memory Controller device > + > +The Samsung Exynos5422 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". The compatible name is wrong. - exynos5422-bus -> exynos5422-dmc > +- clock-names : the name of clock used by the bus, "bus". 'bus' is right? > +- clocks : phandles for clock specified in "clock-names" property. > +- devfreq-events : phandles for PPMU devices connected to this DMC. The dt-binging file doesn't contain the any description for 'reg' properties. > + > +The example definition of a DMC and PPMU devices declared in DT is shown below: > + > + ppmu_dmc0_0: ppmu@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@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@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@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: memory-controller@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 e81dfbf..ab0d8a5 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -3316,6 +3316,7 @@ L: linux-pm@vger.kernel.org > L: linux-samsung-soc@vger.kernel.org > S: Maintained > F: drivers/devfreq/exynos5422-dmc.c > +F: Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt > > BUSLOGIC SCSI DRIVER > M: Khalid Aziz <khalid@gonehiking.org> > -- > 2.7.4 >
diff --git a/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt new file mode 100644 index 0000000..229efba --- /dev/null +++ b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt @@ -0,0 +1,106 @@ +* Exynos5422 frequency and voltage scaling for Dynamic Memory Controller device + +The Samsung Exynos5422 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@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@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@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@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: memory-controller@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 e81dfbf..ab0d8a5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3316,6 +3316,7 @@ L: linux-pm@vger.kernel.org L: linux-samsung-soc@vger.kernel.org S: Maintained F: drivers/devfreq/exynos5422-dmc.c +F: Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt BUSLOGIC SCSI DRIVER M: Khalid Aziz <khalid@gonehiking.org>
The patch adds description for DT binding for a new Exynos5422 Dynamic Memory Controller device. It also contains needed MAINTAINERS file update. Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com> --- .../devicetree/bindings/devfreq/exynos5422-dmc.txt | 106 +++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 107 insertions(+) create mode 100644 Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt