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Date: Wed, 6 Mar 2019 08:14:55 +0100
From: Lukasz Luba <l.luba@...tner.samsung.com>
To: Chanwoo Choi <cw00.choi@...sung.com>, 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,
kyungmin.park@...sung.com, m.szyprowski@...sung.com,
s.nawrocki@...sung.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH v5 4/8] dt-bindings: devfreq: add Exynos5422 DMC device
description
Hi Chanwoo,
On 3/6/19 5:18 AM, Chanwoo Choi wrote:
> Hi Lukasz,
>
> On 19. 3. 5. 오후 7:19, Lukasz Luba wrote:
>> The patch adds description for DT binding for a new Exynos5422 Dynamic
>> Memory Controller device.
>>
>> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
>> ---
>> .../devicetree/bindings/devfreq/exynos5422-dmc.txt | 177 +++++++++++++++++++++
>> 1 file changed, 177 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..0e73e98
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/devfreq/exynos5422-dmc.txt
>> @@ -0,0 +1,177 @@
>> +* 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.
>
>
> I already replied with following comments on v4 patch[1].
> But, you didn't reply anything. We can reduce the duplicate
> review by keeping the basic review rule.
I have lost these changes while I was adding the OPPs, timings into the
dt-binding.
>
> - Re: [PATCH v4 5/8] dt-bindings: devfreq: add Exynos5422 DMC device description
> [1] https://do-db2.lkml.org/lkml/2019/2/3/64
>
>
> [Following comments were replied on v4 patch[1]]
>
>> +- compatible: Should be "samsung,exynos5422-bus".
>
> The compatible name is wrong.
> - exynos5422-bus -> exynos5422-dmc
>
>> +- clock-names : the name of clock used by the bus, "bus".
>
> 'bus' is right?
right
>
>> +- clocks : phandles for clock specified in "clock-names" property.
>> +- devfreq-events : phandles for PPMU devices connected to this DMC.
>
> The dt-binging file doesn't contain the any description for 'reg' properties.
There are 3 regs: cdrex0, cdrex1, chip_id. I will add this description.
The patch set has this OPPs and timings coming from DT as you requested
but I am not sure if it is in the right place in the DT.
Thus dt-binding you may consider as 'in-progress' till the DT entries
are fixed
Regards,
Lukasz
>
>
>
>> +
>> +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>,
>> + <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 CLK_CDREX_PAUSE>,
>> + <&clock CLK_CDREX_TIMING_SET>;
>> + 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",
>> + "clk_cdrex_pause",
>> + "clk_cdrex_timing_set";
>> + status = "okay";
>> + operating-points-v2 = <&dmc_opp_table>;
>> + devfreq-events = <&ppmu_dmc0_0>, <&ppmu_dmc0_1>,
>> + <&ppmu_dmc1_0>, <&ppmu_dmc1_1>;
>> + };
>> +
>> +The needed timings of DRAM memory are stored in dedicated nodes.
>> +There are two nodes with regular timings and for bypass mode.
>> +
>> + dmc_bypass_mode: bypass_mode {
>> + compatible = "samsung,dmc-bypass-mode";
>> +
>> + freq-hz = <400000000>;
>> + volt-uv = <887500>;
>> + dram-timing-row = <0x365a9713>;
>> + dram-timing-data = <0x4740085e>;
>> + dram-timing-power = <0x543a0446>;
>> + };
>> +
>> + dram_timing: timing {
>> + compatible = "samsung,dram-timing";
>> +
>> + dram-timing-names = "165MHz", "206MHz", "275MHz", "413MHz",
>> + "543MHz", "633MHz", "728MHz", "825MHz";
>> + dram-timing-row = <0x11223185>, <0x112331C6>, <0x12244287>,
>> + <0x1B35538A>, <0x244764CD>, <0x2A48758F>,
>> + <0x30598651>, <0x365A9713>;
>> + dram-timing-data = <0x2720085E>, <0x2720085E>, <0x2720085E>,
>> + <0x2720085E>, <0x3730085E>, <0x3730085E>,
>> + <0x3730085E>, <0x4740085E>;
>> + dram-timing-power = <0x140C0225>, <0x180F0225>, <0x1C140225>,
>> + <0x2C1D0225>, <0x38270335>, <0x402D0335>,
>> + <0x4C330336>, <0x543A0446>;
>> + };
>> +
>> +The frequencies supported by the DMC are stored in OPP table v2.
>> +
>> + dmc_opp_table: opp_table2 {
>> + compatible = "operating-points-v2";
>> +
>> + opp00 {
>> + opp-hz = /bits/ 64 <165000000>;
>> + opp-microvolt = <875000>;
>> + };
>> + opp01 {
>> + opp-hz = /bits/ 64 <206000000>;
>> + opp-microvolt = <875000>;
>> + };
>> + opp02 {
>> + opp-hz = /bits/ 64 <275000000>;
>> + opp-microvolt = <875000>;
>> + };
>> + opp03 {
>> + opp-hz = /bits/ 64 <413000000>;
>> + opp-microvolt = <887500>;
>> + };
>> + opp04 {
>> + opp-hz = /bits/ 64 <543000000>;
>> + opp-microvolt = <937500>;
>> + };
>> + opp05 {
>> + opp-hz = /bits/ 64 <633000000>;
>> + opp-microvolt = <1012500>;
>> + };
>> + opp06 {
>> + opp-hz = /bits/ 64 <728000000>;
>> + opp-microvolt = <1037500>;
>> + };
>> + opp07 {
>> + opp-hz = /bits/ 64 <825000000>;
>> + opp-microvolt = <1050000>;
>> + };
>> + };
>> +
>>
>
>
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