This patch adds the documentation for rockchip rk3399 dmc driver.
Signed-off-by: Lin Huang <hl@xxxxxxxxxxxxxx>
Reviewed-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
Changes in v10:
- add rockchip prefix in property describe
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..84660a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
@@ -0,0 +1,210 @@
+* 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";
+ };
+
--
2.6.6
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