@@ -1,155 +1,158 @@
-* Rockchip rk3399 DMC(Dynamic Memory Controller) device
+* 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/
+ Documentation/devicetree/bindings/devfreq/event/
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.
+- interrupts: The CPU interrupt number. The interrupt specifier
+ format depends on the interrupt controller.
+ It should be a DCF interrupt. When DDR DVFS finishes
+ a DCF interrupt is triggered.
- 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
+- operating-points-v2: Refer to Documentation/devicetree/bindings/opp/opp.txt
for details.
- center-supply: DMC supply node.
- status: Marks the node enabled/disabled.
-Following properties are ddr timing:
+Following properties relate to 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
+ it selects the DDR3 cl-trp-trcd type. It must be
+ set according to "Speed Bin" in DDR3 datasheet,
+ DO NOT use a smaller "Speed Bin" than specified
+ for the DDR3 being used.
+
+- rockchip,pd_idle : Configure the PD_IDLE value. Defines the
+ power-down idle period in which memories are
+ placed into power-down mode if bus is idle
+ for PD_IDLE DFI clock cycles.
+
+- rockchip,sr_idle : Configure the SR_IDLE value. Defines the
+ self-refresh idle period in which memories are
+ placed into self-refresh mode if bus is idle
+ for SR_IDLE * 1024 DFI clock cycles (DFI
+ clocks freq is half of DRAM clock), default
+ value is "0".
+
+- rockchip,sr_mc_gate_idle : Defines the memory self-refresh and controller
+ clock gating idle period. Memories are placed
+ into self-refresh mode and memory controller
+ clock arg gating started if bus is idle for
+ sr_mc_gate_idle*1024 DFI clock cycles.
+
+- rockchip,srpd_lite_idle : Defines the self-refresh power down idle
+ period in which memories are placed into
+ self-refresh power down mode if bus is idle
+ for srpd_lite_idle * 1024 DFI clock cycles.
+ This parameter is for LPDDR4 only.
+
+- rockchip,standby_idle : Defines the standby idle period in which
+ memories are placed into self-refresh mode.
+ The controller, pi, PHY and DRAM clock will
+ be gated if bus is idle for standby_idle * DFI
+ clock cycles.
+
+- rockchip,dram_dll_disb_freq : Defines the DDR3 DLL bypass frequency in MHz.
+ When DDR frequency is less than DRAM_DLL_DISB_FREQ,
+ DDR3 DLL will be bypassed. Note: if DLL was bypassed,
+ the odt will also stop working.
+
+- rockchip,phy_dll_disb_freq : Defines the PHY dll bypass frequency in
+ MHz (Mega Hz). When DDR frequency is less than
+ DRAM_DLL_DISB_FREQ, PHY DLL will be bypassed.
+ Note: PHY DLL and PHY ODT are independent.
+
+- rockchip,ddr3_odt_disb_freq : When the DRAM type is DDR3, this parameter defines
+ the ODT disable frequency in MHz (Mega Hz).
+ when the DDR frequency is less then ddr3_odt_disb_freq,
+ the ODT on the 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
+- rockchip,ddr3_drv : When the DRAM type is DDR3, this parameter defines
+ the DRAM side driver strength in ohms. 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
+- rockchip,ddr3_odt : When the DRAM type is DDR3, this parameter defines
+ the DRAM side ODT strength in ohms. 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,
+- rockchip,phy_ddr3_ca_drv : When the DRAM type is DDR3, this parameter defines
+ 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_dq_drv : When the DRAM type is DDR3, this parameter defines
+ the PHY side DQ line (including 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
+- rockchip,phy_ddr3_odt : When the DRAM type is DDR3, this parameter defines
+ 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
+- rockchip,lpddr3_odt_disb_freq : When the DRAM type is LPDDR3, this parameter defines
+ then ODT disable frequency in MHz (Mega Hz).
+ When DDR frequency is less then ddr3_odt_disb_freq,
+ the ODT on the 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
+- rockchip,lpddr3_drv : When the DRAM type is LPDDR3, this parameter defines
+ the DRAM side driver strength in ohms. 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
+- rockchip,lpddr3_odt : When the DRAM type is LPDDR3, this parameter defines
+ the DRAM side ODT strength in ohms. 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,
+- rockchip,phy_lpddr3_ca_drv : When the DRAM type is LPDDR3, this parameter defines
+ the PHY side CA line (including command line,
address line and clock line) driver strength.
- default value is PHY_DRV_ODT_40.
+ 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
+- rockchip,phy_lpddr3_dq_drv : When the DRAM type is LPDDR3, this parameter defines
+ the PHY side DQ line (including 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
+- rockchip,lpddr4_odt_disb_freq : When the DRAM type is LPDDR4, this parameter
+ defines the ODT disable frequency in
+ MHz (Mega Hz). When the DDR frequency is less then
+ ddr3_odt_disb_freq, the ODT on the 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
+- rockchip,lpddr4_drv : When the DRAM type is LPDDR4, this parameter defines
+ the DRAM side driver strength in ohms. 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_dq_odt : When the DRAM type is LPDDR4, this parameter defines
+ the DRAM side ODT on DQS/DQ line strength in ohms.
+ 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,lpddr4_ca_odt : When the DRAM type is LPDDR4, this parameter defines
+ the DRAM side ODT on CA line strength in ohms.
+ 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
+- rockchip,phy_lpddr4_ca_drv : When the DRAM type is LPDDR4, this parameter defines
+ the PHY side CA line (including 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_ck_cs_drv : When the DRAM type is LPDDR4, this parameter defines
+ 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_dq_drv : When the DRAM type is LPDDR4, this parameter defines
+ the PHY side DQ line (including 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
+- rockchip,phy_lpddr4_odt : When the DRAM type is LPDDR4, this parameter defines
+ the PHY side ODT strength. Default value is
PHY_DRV_ODT_60.
Example: