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Documentation: bindings: add dt documentation for rk3399 dmc
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This patch adds the documentation for rockchip rk3399 dmc driver.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
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Lin Huang authored and MyungJoo Ham committed Sep 6, 2016
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209 changes: 209 additions & 0 deletions Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
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* 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:

- rockchip,dram_speed_bin : Value reference 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.

- rockchip,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.

- rockchip,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".

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,ddr3_drv : When dram type is DDR3, this parameter define
the dram side driver stength in ohm, default
value is DDR3_DS_40ohm.

- rockchip,ddr3_odt : When dram type is DDR3, this parameter define
the dram side ODT stength in ohm, default value
is DDR3_ODT_120ohm.

- rockchip,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.

- rockchip,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.

- rockchip,phy_ddr3_odt : When dram type is DDR3, this parameter define the
phy side odt strength, default value is
PHY_DRV_ODT_240.

- rockchip,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.

- rockchip,lpddr3_drv : When dram type is LPDDR3, this parameter define
the dram side driver stength in ohm, default
value is LP3_DS_34ohm.

- rockchip,lpddr3_odt : When dram type is LPDDR3, this parameter define
the dram side ODT stength in ohm, default value
is LP3_ODT_240ohm.

- rockchip,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.

- rockchip,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.

- rockchip,phy_lpddr3_odt : When dram type is LPDDR3, this parameter define
the phy side odt strength, default value is
PHY_DRV_ODT_240.

- rockchip,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.

- rockchip,lpddr4_drv : When dram type is LPDDR4, this parameter define
the dram side driver stength in ohm, default
value is LP4_PDDS_60ohm.

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,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.

- rockchip,phy_lpddr4_odt : When dram type is LPDDR4, this parameter define
the phy side odt strength, default value is
PHY_DRV_ODT_60.

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 = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
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 = <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 = <333>;
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 = <333>;
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>;
status = "disabled";
};

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