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From: Lukasz Luba <l.luba@partner.samsung.com>
To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	b.zolnierkie@samsung.com, krzk@kernel.org,
	Lukasz Luba <l.luba@partner.samsung.com>,
	cw00.choi@samsung.com, kyungmin.park@samsung.com,
	kgene@kernel.org, myungjoo.ham@samsung.com,
	s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org,
	m.szyprowski@samsung.com
Subject: [PATCH v4 5/8] dt-bindings: devfreq: add Exynos5422 DMC device description
Date: Fri,  1 Feb 2019 17:46:49 +0100
Message-ID: <1549039612-28905-6-git-send-email-l.luba@partner.samsung.com> (raw)
In-Reply-To: <CGME20190201164720eucas1p1ae770f7981fa09016b69ca7265e820c7@eucas1p1.samsung.com>

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".
+- 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>
-- 
2.7.4


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linux-arm-kernel mailing list
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  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1549039612-28905-1-git-send-email-l.luba@partner.samsung.com>
     [not found] ` <CGME20190201164718eucas1p1bca3a199d60e109e1da654d8afff2a47@eucas1p1.samsung.com>
2019-02-01 16:46   ` [PATCH v4 1/8] clk: samsung: add needed IDs for DMC clocks in Exynos5420 Lukasz Luba
2019-02-13 21:07     ` Rob Herring
     [not found] ` <CGME20190201164719eucas1p2091c6d41a6cc21a3d36081daf4bc8267@eucas1p2.samsung.com>
2019-02-01 16:46   ` [PATCH v4 2/8] clk: samsung: add new clocks for DMC for Exynos5422 SoC Lukasz Luba
2019-02-03  9:56     ` Chanwoo Choi
2019-02-11 11:11       ` Lukasz Luba
2019-02-12  6:04         ` Chanwoo Choi
     [not found] ` <CGME20190201164719eucas1p106c8761eb4bff12a906b601a37bf58b5@eucas1p1.samsung.com>
2019-02-01 16:46   ` [PATCH v4 3/8] clk: samsung: add BPLL rate table for Exynos 5422 SoC Lukasz Luba
     [not found] ` <CGME20190201164720eucas1p13aac6550399d240b261a2cbe489d3dfc@eucas1p1.samsung.com>
2019-02-01 16:46   ` [PATCH v4 4/8] drivers: devfreq: add DMC driver for Exynos5422 Lukasz Luba
2019-02-03 12:23     ` Chanwoo Choi
2019-03-06 13:44       ` Sylwester Nawrocki
2019-03-07  1:10         ` Chanwoo Choi
2019-03-07  8:41           ` Sylwester Nawrocki
     [not found] ` <CGME20190201164720eucas1p1ae770f7981fa09016b69ca7265e820c7@eucas1p1.samsung.com>
2019-02-01 16:46   ` Lukasz Luba [this message]
2019-02-03 12:28     ` [PATCH v4 5/8] dt-bindings: devfreq: add Exynos5422 DMC device description Chanwoo Choi
     [not found] ` <CGME20190201164721eucas1p286976bab0cc9e06c2cf74a0eaa20144e@eucas1p2.samsung.com>
2019-02-01 16:46   ` [PATCH v4 6/8] DT: arm: exynos: add DMC device for exynos5422 Lukasz Luba
2019-02-08  8:14     ` Krzysztof Kozlowski
     [not found] ` <CGME20190201164722eucas1p1b619d939e0f93ddb9ee1af7306e7cf67@eucas1p1.samsung.com>
2019-02-01 16:46   ` [PATCH v4 7/8] drivers: devfreq: events: add Exynos PPMU new events Lukasz Luba
     [not found] ` <CGME20190201164723eucas1p1ec009489584e1c85fd0d62270796e003@eucas1p1.samsung.com>
2019-02-01 16:46   ` [PATCH v4 8/8] ARM: exynos_defconfig: enable DMC driver Lukasz Luba
2019-02-08  8:15     ` Krzysztof Kozlowski

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