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Message-ID: <20190225134913.GA32033@bogus>
Date: Mon, 25 Feb 2019 07:49:13 -0600
From: Rob Herring <robh@...nel.org>
To: Lukasz Luba <l.luba@...tner.samsung.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, 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>,
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 Tue, Jan 29, 2019 at 05:02:49PM +0100, Lukasz Luba wrote:
> Hi Krzysztof,
>
> On 1/29/19 3:47 PM, Krzysztof Kozlowski wrote:
> > 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.
> OK, I will fix it.
> >
> >> +
> >> + 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.
> Thank you for the review. I will move the dt-bindings in the patch set
> after the dmc driver file. Then the MAINTAINERS file will be updated
> only by one entry.
No, bindings should come first. Just move this hunk to the driver patch
including the line here for the binding.
Rob
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