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Date: Tue, 29 Jan 2019 15:47:32 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Lukasz Luba <l.luba@...tner.samsung.com>
Cc: devicetree@...r.kernel.org,
Bartłomiej Żołnierkiewicz
<b.zolnierkie@...sung.com>, myungjoo.ham@...sung.com,
Kyungmin Park <kyungmin.park@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Kukjin Kim <kgene@...nel.org>, linux-pm@...r.kernel.org,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] dt-bindings: devfreq: add DMC device description
On Mon, 28 Jan 2019 at 20:21, Lukasz Luba <l.luba@...tner.samsung.com> wrote:
>
> 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 <myungjoo.ham@...sung.com>
> CC: Kyungmin Park <kyungmin.park@...sung.com>
> CC: Chanwoo Choi <cw00.choi@...sung.com>
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Mark Rutland <mark.rutland@....com>
> CC: Kukjin Kim <kgene@...nel.org>
> CC: Krzysztof Kozlowski <krzk@...nel.org>
> CC: linux-pm@...r.kernel.org
> CC: linux-samsung-soc@...r.kernel.org
> CC: devicetree@...r.kernel.org
> CC: linux-arm-kernel@...ts.infradead.org
> CC: linux-kernel@...r.kernel.org
> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
> ---
> .../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@...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_dmc0_1@...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_dmc1_0@...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_dmc1_1@...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: dmc@...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>
> + ;
Join with previous line.
> + 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"
> + ;
Ditto.
> +
> + 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 <l.luba@...tner.samsung.com>
> +L: linux-pm@...r.kernel.org
> +L: linux-samsung-soc@...r.kernel.org
> +S: Maintained
> +F: Documentation/devicetree/bindings/devfreq/exynos5-dmc.txt
Maintainers change should go with the next change, I think. It looks
unusual to add an entry for driver... without the driver.
Best regards,
Krzysztof
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