From mboxrd@z Thu Jan 1 00:00:00 1970 From: cw00.choi@samsung.com (Chanwoo Choi) Date: Mon, 05 Sep 2016 09:38:24 +0900 Subject: [PATCH v9 3/5] Documentation: bindings: add dt documentation for rk3399 dmc In-Reply-To: <1472850525-25273-4-git-send-email-hl@rock-chips.com> References: <1472850525-25273-1-git-send-email-hl@rock-chips.com> <1472850525-25273-4-git-send-email-hl@rock-chips.com> Message-ID: <57CCBE80.8060906@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Lin, Looks good to me. I add one comment on below. If you modify it according to my comment, feel free to add my tag. Reviewed-by: Chanwoo Choi On 2016? 09? 03? 06:08, Lin Huang wrote: > This patch adds the documentation for rockchip rk3399 dmc driver. > > Signed-off-by: Lin Huang > --- > Changes in v9: > - add ddr timing property to node > > Changes in v8: > - add ddr timing properties > > 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 | 202 +++++++++++++++++++++ > 1 file changed, 202 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..f187c8fa > --- /dev/null > +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt > @@ -0,0 +1,202 @@ > +* 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. > + > +Following properties are ddr timing: > + > +- dram_speed_bin : Value is defined at include/dt-bindings/clock/ddr.h, > + it select ddr3 cl-trp-trcd type, default value > + "DDR3_DEFAULT".it must selected according to > + "Speed Bin" in ddr3 datasheet, DO NOT use smaller > + "Speed Bin" than ddr3 exactly is. > + > +- pd_idle : Config the PD_IDLE value, defined the power-down idle > + period, memories are places into power-down mode if > + bus is idle for PD_IDLE DFI clocks. > + > +- sr_idle : Configure the SR_IDLE value, defined the selfrefresh > + idle period, memories are places into self-refresh > + mode if bus is idle for SR_IDLE*1024 DFI clocks > + (DFI clocks freq is half of dram's clocks), defaule > + value is "0". > + > +- sr_mc_gate_idle : Defined the self-refresh with memory and controller > + clock gating idle period, memories are places into > + self-refresh mode and memory controller clock arg > + gating if bus is idle for sr_mc_gate_idle*1024 DFI > + clocks. > + > +- srpd_lite_idle : Defined the self-refresh power down idle period, > + memories are places into self-refresh power down > + mode if bus is idle for srpd_lite_idle*1024 DFI > + clocks. This parameter is for LPDDR4 only. > + > +- standby_idle : Defined the standby idle period, memories are places > + into self-refresh than controller, pi, phy and dram > + clock will gating if bus is idle for > + standby_idle * DFI clocks. > + > +- dram_dll_disb_freq : It's defined the DDR3 dll bypass frequency in MHz > + when ddr freq less than DRAM_DLL_DISB_FREQ, ddr3 > + dll will bypssed note: if dll was bypassed, the > + odt also stop working. > + > +- phy_dll_disb_freq : Defined the PHY dll bypass frequency in MHz (Mega Hz), > + when ddr freq less than DRAM_DLL_DISB_FREQ, phy dll > + will bypssed. note: phy dll and phy odt are > + independent > + > +- ddr3_odt_disb_freq : When dram type is DDR3, this parameter defined the > + odt disable frequency in MHz (Mega Hz), when ddr > + frequency less then ddr3_odt_disb_freq, the odt > + on dram side and controller side are both disabled. > + > +- ddr3_drv : When dram type is DDR3, this parameter define the > + dram side driver stength in ohm, default value is > + DDR3_DS_40ohm. > + > +- ddr3_odt : When dram type is DDR3, this parameter define the > + dram side ODT stength in ohm, default value is > + DDR3_ODT_120ohm. > + > +- phy_ddr3_ca_drv : When dram type is DDR3, this parameter define the phy > + side CA line(incluing command line, address line and > + clock line) driver strength. default value is > + PHY_DRV_ODT_40. > + > +- phy_ddr3_dq_drv : When dram type is DDR3, this parameter define the phy > + side DQ line(incluing DQS/DQ/DM line) driver strength. > + default value is PHY_DRV_ODT_40. > + > +- phy_ddr3_odt : When dram type is DDR3, this parameter define the > + phy side odt strength, default value is > + PHY_DRV_ODT_240. > + > +- lpddr3_odt_disb_freq : When dram type is LPDDR3, this parameter defined then > + odt disable frequency in MHz (Mega Hz), when ddr > + frequency less then ddr3_odt_disb_freq, the odt on > + dram side and controller side are both disabled. > + > +- lpddr3_drv : When dram type is LPDDR3, this parameter define the > + dram side driver stength in ohm, default value is > + LP3_DS_34ohm. > + > +- lpddr3_odt : When dram type is LPDDR3, this parameter define the > + dram side ODT stength in ohm, default value is > + LP3_ODT_240ohm. > + > +- phy_lpddr3_ca_drv : When dram type is LPDDR3, this parameter define the > + phy side CA line(incluing command line, address line > + and clock line) driver strength. default value is > + PHY_DRV_ODT_40. > + > +- phy_lpddr3_dq_drv : When dram type is LPDDR3, this parameter define the > + phy side DQ line(incluing DQS/DQ/DM line) driver > + strength. default value is PHY_DRV_ODT_40. > + > +- phy_lpddr3_odt : When dram type is LPDDR3, this parameter define the phy > + side odt strength, default value is PHY_DRV_ODT_240. > + > +- lpddr4_odt_disb_freq : When dram type is LPDDR4, this parameter defined the > + odt disable frequency in MHz (Mega Hz), when ddr > + frequency less then ddr3_odt_disb_freq, the odt on > + dram side and controller side are both disabled. > + > +- lpddr4_drv : When dram type is LPDDR4, this parameter define the > + dram side driver stength in ohm, default value is > + LP4_PDDS_60ohm. > + > +- lpddr4_dq_odt : When dram type is LPDDR4, this parameter define the > + dram side ODT on dqs/dq line stength in ohm, default > + value is LP4_DQ_ODT_40ohm. > + > +- lpddr4_ca_odt : When dram type is LPDDR4, this parameter define the > + dram side ODT on ca line stength in ohm, default value > + is LP4_CA_ODT_40ohm. > + > +- phy_lpddr4_ca_drv : When dram type is LPDDR4, this parameter define the > + phy side CA line(incluing command address line) > + driver strength. default value is PHY_DRV_ODT_40. > + > +- phy_lpddr4_ck_cs_drv : When dram type is LPDDR4, this parameter define the > + phy side clock line and cs line driver strength. > + default value is PHY_DRV_ODT_80. > + > +- phy_lpddr4_dq_drv : When dram type is LPDDR4, this parameter define the > + phy side DQ line(incluing DQS/DQ/DM line) driver > + strength. default value is PHY_DRV_ODT_80. > + > +- phy_lpddr4_odt : When dram type is LPDDR4, this parameter define the > + phy side odt strength, default value is PHY_DRV_ODT_60. You better to add the 'rockchip,' prefix to property for ddr timing because below example include the 'rockchip,'. > + > +Example: > + 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 = ; > + clocks = <&cru SCLK_DDRCLK>; > + clock-names = "dmc_clk"; > + operating-points-v2 = <&dmc_opp_table>; > + center-supply = <&ppvar_centerlogic>; > + upthreshold = <15>; > + downdifferential = <10>; > + 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 = <300>; > + rockchip,phy_dll_dis_freq = <125>; > + rockchip,auto_pd_dis_freq = <666>; > + rockchip,ddr3_odt_dis_freq = <333>; > + rockchip,ddr3_drv = ; > + rockchip,ddr3_odt = ; > + rockchip,phy_ddr3_ca_drv = ; > + rockchip,phy_ddr3_dq_drv = ; > + rockchip,phy_ddr3_odt = ; > + rockchip,lpddr3_odt_dis_freq = <333>; > + rockchip,lpddr3_drv = ; > + rockchip,lpddr3_odt = ; > + rockchip,phy_lpddr3_ca_drv = ; > + rockchip,phy_lpddr3_dq_drv = ; > + rockchip,phy_lpddr3_odt = ; > + rockchip,lpddr4_odt_dis_freq = <333>; > + rockchip,lpddr4_drv = ; > + rockchip,lpddr4_dq_odt = ; > + rockchip,lpddr4_ca_odt = ; > + rockchip,phy_lpddr4_ca_drv = ; > + rockchip,phy_lpddr4_ck_cs_drv = ; > + rockchip,phy_lpddr4_dq_drv = ; > + rockchip,phy_lpddr4_odt = ; > + status = "disabled"; > + }; > + > -- Best Regards, Chanwoo Choi