linux-kernel - Re: [PATCH v3 4/5] arm64: dts: rk3399: Add dfi and dmc nodes.

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Date:   Thu, 11 Apr 2019 15:20:53 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Gaël PORTAY <gael.portay@...labora.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Lin Huang <hl@...k-chips.com>,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        Derek Basehore <dbasehore@...omium.org>,
        Randy Li <ayaka@...lik.info>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v3 4/5] arm64: dts: rk3399: Add dfi and dmc nodes.

Hi Gaël,

Am Freitag, 22. März 2019, 00:14:39 CEST schrieb Gaël PORTAY:
> From: Lin Huang <hl@...k-chips.com>
> 
> These are required to support DDR DVFS on rk3399 platform. The patch also
> introduces a new file with default DRAM settings.
> 
> Signed-off-by: Lin Huang <hl@...k-chips.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>

> +	dmc: dmc {
> +		compatible = "rockchip,rk3399-dmc";
> +		rockchip,pmu = <&pmugrf>;
> +		devfreq-events = <&dfi>;
> +		clocks = <&cru SCLK_DDRC>;
> +		clock-names = "dmc_clk";
> +		status = "disabled";
> +		rockchip,ddr3_speed_bin = <21>;
> +		rockchip,pd_idle = <0x40>;
> +		rockchip,sr_idle = <0x2>;
> +		rockchip,sr_mc_gate_idle = <0x3>;
> +		rockchip,srpd_lite_idle	= <0x4>;
> +		rockchip,standby_idle = <0x2000>;
> +		rockchip,dram_dll_dis_freq = <300000000>;
> +		rockchip,phy_dll_dis_freq = <125000000>;
> +		rockchip,auto_pd_dis_freq = <666000000>;
> +		rockchip,ddr3_odt_dis_freq = <333000000>;
> +		rockchip,ddr3_drv = <DDR3_DS_40ohm>;
> +		rockchip,ddr3_odt = <DDR3_ODT_120ohm>;
> +		rockchip,phy_ddr3_ca_drv = <PHY_DRV_ODT_40>;
> +		rockchip,phy_ddr3_dq_drv = <PHY_DRV_ODT_40>;
> +		rockchip,phy_ddr3_odt = <PHY_DRV_ODT_240>;
> +		rockchip,lpddr3_odt_dis_freq = <333000000>;
> +		rockchip,lpddr3_drv = <LP3_DS_34ohm>;
> +		rockchip,lpddr3_odt = <LP3_ODT_240ohm>;
> +		rockchip,phy_lpddr3_ca_drv = <PHY_DRV_ODT_40>;
> +		rockchip,phy_lpddr3_dq_drv = <PHY_DRV_ODT_40>;
> +		rockchip,phy_lpddr3_odt = <PHY_DRV_ODT_240>;
> +		rockchip,lpddr4_odt_dis_freq = <333000000>;
> +		rockchip,lpddr4_drv = <LP4_PDDS_60ohm>;
> +		rockchip,lpddr4_dq_odt = <LP4_DQ_ODT_40ohm>;
> +		rockchip,lpddr4_ca_odt = <LP4_CA_ODT_40ohm>;
> +		rockchip,phy_lpddr4_ca_drv = <PHY_DRV_ODT_40>;
> +		rockchip,phy_lpddr4_ck_cs_drv = <PHY_DRV_ODT_80>;
> +		rockchip,phy_lpddr4_dq_drv = <PHY_DRV_ODT_80>;
> +		rockchip,phy_lpddr4_odt = <PHY_DRV_ODT_60>;

as Rob mentioned in his review, these values look board-specific,
so should probably move over to the specific board you're using them
on?


Heiko