Re: [PATCH v6 09/10] ARM: dts: exynos: add DMC device for exynos5422

Lukasz Luba
2019-04-29T12:38:53Z

Hi Krzysztof,

Thank you the review, please check my comments below.

On 4/23/19 1:03 PM, Krzysztof Kozlowski wrote:
> On Fri, 19 Apr 2019 at 16:19, Lukasz Luba <l.luba@partner.samsung.com> wrote:
>>
>> Add description of Dynamic Memory Controller and PPMU counters.
>> They are used by exynos5422-dmc driver.
>> There is a definition of the memory chip, hwich is then used during
>
> which
ACK
>
>> calculation of timings for each OPP.
>> The algorithm in the driver needs these two sets to bound the timings.
>>
>> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
>> ---
>> arch/arm/boot/dts/exynos5420.dtsi | 120 ++++++++++++++++++++++++++
>> arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 120 ++++++++++++++++++++++++++
>> 2 files changed, 240 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
>> index aaff158..b687cd7 100644
>> --- a/arch/arm/boot/dts/exynos5420.dtsi
>> +++ b/arch/arm/boot/dts/exynos5420.dtsi
>> @@ -14,6 +14,7 @@
>> #include <dt-bindings/clock/exynos5420.h>
>> #include <dt-bindings/clock/exynos-audss-clk.h>
>> #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +#include <dt-bindings/pmu/exynos_ppmu.h>
>>
>> / {
>> compatible = "samsung,exynos5420", "samsung,exynos5";
>> @@ -235,6 +236,37 @@
>> status = "disabled";
>> };
>>
>> + dmc: memory-controller@10c20000 {
>> + compatible = "samsung,exynos5422-dmc";
>> + reg = <0x10c20000 0x10000>, <0x10c30000 0x10000>,
>
> I think in the driver you access range up to 0xff of each DREX memory
> region. Do not map entire 0x10000 if not needed.
I agree, I will map only 0x100.
>
>
>> + <0x10000000 0x1000>, <0x10030000 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 = "disabled";
>> + };
>> +
>> nocp_mem0_0: nocp@10ca1000 {
>> compatible = "samsung,exynos5420-nocp";
>> reg = <0x10CA1000 0x200>;
>> @@ -271,6 +303,94 @@
>> status = "disabled";
>> };
>>
>> + ppmu_dmc0_0: ppmu@10d00000 {
>> + compatible = "samsung,exynos-ppmu";
>> + reg = <0x10d00000 0x2000>;
>> + clocks = <&clock CLK_PCLK_PPMU_DREX0_0>;
>> + clock-names = "ppmu";
>> + events {
>> + ppmu_event0_dmc0_0: ppmu-event0-dmc0_0 {
>> + event-name = "ppmu-event0-dmc0_0";
>> + event-data-type = <PPMU_RO_DATA_CNT>;
>> + };
>> + ppmu_event1_dmc0_0: ppmu-event1-dmc0_0 {
>> + event-name = "ppmu-event1-dmc0_0";
>> + event-data-type = <PPMU_WO_DATA_CNT>;
>> + };
>> + ppmu_event3_dmc0_0: ppmu-event3-dmc0_0 {
>> + event-name = "ppmu-event3-dmc0_0";
>> + event-data-type = <(PPMU_RO_DATA_CNT |
>> + PPMU_WO_DATA_CNT)>;
>> + };
>> + };
>> + };
>> +
>> + ppmu_dmc0_1: ppmu@10d10000 {
>> + compatible = "samsung,exynos-ppmu";
>> + reg = <0x10d10000 0x2000>;
>> + clocks = <&clock CLK_PCLK_PPMU_DREX0_1>;
>> + clock-names = "ppmu";
>> + events {
>> + ppmu_event0_dmc0_1: ppmu-event0-dmc0_1 {
>> + event-name = "ppmu-event0-dmc0_1";
>> + event-data-type = <PPMU_RO_DATA_CNT>;
>> + };
>> + ppmu_event1_dmc0_1: ppmu-event1-dmc0_1 {
>> + event-name = "ppmu-event1-dmc0_1";
>> + event-data-type = <PPMU_WO_DATA_CNT>;
>> + };
>> + ppmu_event3_dmc0_1: ppmu-event3-dmc0_1 {
>> + event-name = "ppmu-event3-dmc0_1";
>> + event-data-type = <(PPMU_RO_DATA_CNT |
>> + PPMU_WO_DATA_CNT)>;
>> + };
>> + };
>> + };
>> +
>> + ppmu_dmc1_0: ppmu@10d60000 {
>> + compatible = "samsung,exynos-ppmu";
>> + reg = <0x10d60000 0x2000>;
>> + clocks = <&clock CLK_PCLK_PPMU_DREX1_0>;
>> + clock-names = "ppmu";
>> + events {
>> + ppmu_event0_dmc1_0: ppmu-event0-dmc1_0 {
>> + event-name = "ppmu-event0-dmc1_0";
>> + event-data-type = <PPMU_RO_DATA_CNT>;
>> + };
>> + ppmu_event1_dmc1_0: ppmu-event1-dmc1_0 {
>> + event-name = "ppmu-event1-dmc1_0";
>> + event-data-type = <PPMU_WO_DATA_CNT>;
>> + };
>> + ppmu_event3_dmc1_0: ppmu-event3-dmc1_0 {
>> + event-name = "ppmu-event3-dmc1_0";
>> + event-data-type = <(PPMU_RO_DATA_CNT |
>> + PPMU_WO_DATA_CNT)>;
>> + };
>> + };
>> + };
>> +
>> + ppmu_dmc1_1: ppmu@10d70000 {
>> + compatible = "samsung,exynos-ppmu";
>> + reg = <0x10d70000 0x2000>;
>> + clocks = <&clock CLK_PCLK_PPMU_DREX1_1>;
>> + clock-names = "ppmu";
>> + events {
>> + ppmu_event0_dmc1_1: ppmu-event0-dmc1_1 {
>> + event-name = "ppmu-event0-dmc1_1";
>> + event-data-type = <PPMU_RO_DATA_CNT>;
>> + };
>> + ppmu_event1_dmc1_1: ppmu-event1-dmc1_1 {
>> + event-name = "ppmu-event1-dmc1_1";
>> + event-data-type = <PPMU_WO_DATA_CNT>;
>> + };
>> + ppmu_event3_dmc1_1: ppmu-event3-dmc1_1 {
>> + event-name = "ppmu-event3-dmc1_1";
>> + event-data-type = <(PPMU_RO_DATA_CNT |
>> + PPMU_WO_DATA_CNT)>;
>> + };
>> + };
>> + };
>> +
>> gsc_pd: power-domain@10044000 {
>> compatible = "samsung,exynos4210-pd";
>> reg = <0x10044000 0x20>;
>> diff --git a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
>> index 25d95de1..76bf0dbf 100644
>> --- a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
>> +++ b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
>> @@ -34,6 +34,95 @@
>> clock-frequency = <24000000>;
>> };
>> };
>> +
>> + 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>;
>> + };
>> + };
>> +
>> + samsung_K3QF2F20DB: lpddr3 {
>> + compatible = "Samsung,K3QF2F20DB","jedec,lpddr3";
>
> Missing space after coma.
Good catch, thank you.
>
>> + density = <16384>;
>> + io-width = <32>;
>> +
>> + tRFC-min-tck = <17>;
>> + tRRD-min-tck = <2>;
>> + tRPab-min-tck = <2>;
>> + tRPpb-min-tck = <2>;
>> + tRCD-min-tck = <3>;
>> + tRC-min-tck = <6>;
>> + tRAS-min-tck = <5>;
>> + tWTR-min-tck = <2>;
>> + tWR-min-tck = <7>;
>> + tRTP-min-tck = <2>;
>> + tW2W-C2C-min-tck = <0>;
>> + tR2R-C2C-min-tck = <0>;
>> + tWL-min-tck = <8>;
>> + tDQSCK-min-tck = <5>;
>> + tRL-min-tck = <14>;
>> + tFAW-min-tck = <5>;
>> + tXSR-min-tck = <12>;
>> + tXP-min-tck = <2>;
>> + tCKE-min-tck = <2>;
>> + tCKESR-min-tck = <2>;
>> + tMRD-min-tck = <5>;
>> +
>> + timings_samsung_K3QF2F20DB_800mhz: lpddr3-timings@0 {
>
> @0 does not look correct... you do not have <reg>. No DTC warnings here?
Rob also pointed out that it should have 'reg'. I have followed the
LPDDR2 definitions, but in the meantime DT rules have changed and now
'reg' is needed. I will put 'reg' instead of 'max-freq' if Rob agrees.

Regards,
Lukasz
>
> Best regards,
> Krzysztof
>
>