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Message-Id: <1549039612-28905-6-git-send-email-l.luba@partner.samsung.com>
Date: Fri, 1 Feb 2019 17:46:49 +0100
From: Lukasz Luba <l.luba@...tner.samsung.com>
To: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Cc: b.zolnierkie@...sung.com, krzk@...nel.org, kgene@...nel.org,
cw00.choi@...sung.com, kyungmin.park@...sung.com,
m.szyprowski@...sung.com, s.nawrocki@...sung.com,
myungjoo.ham@...sung.com, Lukasz Luba <l.luba@...tner.samsung.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 5/8] dt-bindings: devfreq: add Exynos5422 DMC device
description
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@...tner.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@...00000 {
+ 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@...10000 {
+ 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@...10000 {
+ 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@...70000 {
+ 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@...20000 {
+ 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@...r.kernel.org
L: linux-samsung-soc@...r.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@...ehiking.org>
--
2.7.4
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