[PATCH v7 6/8] Documentation: bindings: add dt documentation for rk3399 dmc

[Chanwoo Choi]

Hi Lin,

I reply the on v6 patch[1].
If you have another opinion, please let me know.
If my suggestion is not reasonable, we need to discuss it.

[1] https://lkml.org/lkml/2016/8/23/28

Best Regards,
Chanwoo Choi

On 2016년 08월 22일 12:36, Lin Huang wrote:
> This patch adds the documentation for rockchip rk3399 dmc driver.
> 
> Signed-off-by: Lin Huang <hl at rock-chips.com>
> ---
> Changes in v7:
> -None
> 
> Changes in v6:
> -Add more detail in Documentation
> 
> Changes in v5:
> -None
> 
> Changes in v4:
> -None
> 
> Changes in v3:
> -None
> 
> Changes in v2:
> -None 
> 
> Changes in v1:
> -None
>  .../devicetree/bindings/devfreq/rk3399_dmc.txt     | 85 ++++++++++++++++++++++
>  1 file changed, 85 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> new file mode 100644
> index 0000000..b787abb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> @@ -0,0 +1,85 @@
> +* Rockchip rk3399 DMC(Dynamic Memory Controller) device
> +
> +Required properties:
> +- compatible: Must be "rockchip,rk3399-dmc".
> +- devfreq-events: Node to get DDR loading, Refer to
> +		  Documentation/devicetree/bindings/devfreq/rockchip-dfi.txt
> +- interrupts: The interrupt number to the CPU. The interrupt specifier format
> +	      depends on the interrupt controller. It should be DCF interrupts,
> +	      when DDR dvfs finish, it will happen.
> +- clocks: Phandles for clock specified in "clock-names" property
> +- clock-names : The name of clock used by the DFI, must be "pclk_ddr_mon";
> +- operating-points-v2: Refer to Documentation/devicetree/bindings/power/opp.txt
> +		       for details.
> +- center-supply: DMC supply node.
> +- status: Marks the node enabled/disabled.
> +
> +Optional properties:
> +- ddr_timing:  DDR timing need to pass to arm trust firmware
> +- upthreshold: The upthreshold to simpleondeamnd policy
> +- downdifferential: The downdifferential to simpleondeamnd policy
> +
> +Example:
> +
> +	ddr_timing: ddr_timing {
> +		compatible = "rockchip,ddr-timing";
> +		ddr3_speed_bin = <21>;
> +		pd_idle = <0>;
> +		sr_idle = <0>;
> +		sr_mc_gate_idle = <0>;
> +		srpd_lite_idle  = <0>;
> +		standby_idle = <0>;
> +		dram_dll_dis_freq = <300>;
> +		phy_dll_dis_freq = <125>;
> +
> +		ddr3_odt_dis_freq = <333>;
> +		ddr3_drv = <DDR3_DS_40ohm>;
> +		ddr3_odt = <DDR3_ODT_120ohm>;
> +		phy_ddr3_ca_drv = <PHY_DRV_ODT_40>;
> +		phy_ddr3_dq_drv = <PHY_DRV_ODT_40>;
> +		phy_ddr3_odt = <PHY_DRV_ODT_240>;
> +
> +		lpddr3_odt_dis_freq = <333>;
> +		lpddr3_drv = <LP3_DS_34ohm>;
> +		lpddr3_odt = <LP3_ODT_240ohm>;
> +		phy_lpddr3_ca_drv = <PHY_DRV_ODT_40>;
> +		phy_lpddr3_dq_drv = <PHY_DRV_ODT_40>;
> +		phy_lpddr3_odt = <PHY_DRV_ODT_240>;
> +
> +		lpddr4_odt_dis_freq = <333>;
> +		lpddr4_drv = <LP4_PDDS_60ohm>;
> +		lpddr4_dq_odt = <LP4_DQ_ODT_40ohm>;
> +		lpddr4_ca_odt = <LP4_CA_ODT_40ohm>;
> +		phy_lpddr4_ca_drv = <PHY_DRV_ODT_40>;
> +		phy_lpddr4_ck_cs_drv = <PHY_DRV_ODT_80>;
> +		phy_lpddr4_dq_drv = <PHY_DRV_ODT_80>;
> +		phy_lpddr4_odt = <PHY_DRV_ODT_60>;
> +	};
> +
> +	dmc_opp_table: dmc_opp_table {
> +		compatible = "operating-points-v2";
> +
> +		opp00 {
> +			opp-hz = /bits/ 64 <300000000>;
> +			opp-microvolt = <900000>;
> +		};
> +		opp01 {
> +			opp-hz = /bits/ 64 <666000000>;
> +			opp-microvolt = <900000>;
> +		};
> +	};
> +
> +	dmc: dmc {
> +		compatible = "rockchip,rk3399-dmc";
> +		devfreq-events = <&dfi>;
> +		interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&cru SCLK_DDRCLK>;
> +		clock-names = "dmc_clk";
> +		ddr_timing = <&ddr_timing>;
> +		operating-points-v2 = <&dmc_opp_table>;
> +		center-supply = <&ppvar_centerlogic>;
> +		upthreshold = <15>;
> +		downdifferential = <10>;
> +		status = "disabled";
> +	};
> +
>