Re: [PATCH 4/8] dt-bindings: devfreq: add DMC device description

[Rob Herring <robh@kernel.org>]

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@partner.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@samsung.com>
> >> CC: Kyungmin Park <kyungmin.park@samsung.com>
> >> CC: Chanwoo Choi <cw00.choi@samsung.com>
> >> CC: Rob Herring <robh+dt@kernel.org>
> >> CC: Mark Rutland <mark.rutland@arm.com>
> >> CC: Kukjin Kim <kgene@kernel.org>
> >> CC: Krzysztof Kozlowski <krzk@kernel.org>
> >> CC: linux-pm@vger.kernel.org
> >> CC: linux-samsung-soc@vger.kernel.org
> >> CC: devicetree@vger.kernel.org
> >> CC: linux-arm-kernel@lists.infradead.org
> >> CC: linux-kernel@vger.kernel.org
> >> Signed-off-by: Lukasz Luba <l.luba@partner.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@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_dmc0_1@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_dmc1_0@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_dmc1_1@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: dmc@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>
> >> +                       ;
> > 
> > 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@partner.samsung.com>
> >> +L:     linux-pm@vger.kernel.org
> >> +L:     linux-samsung-soc@vger.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