Commit graph

58491 commits

Author SHA1 Message Date
Kever Yang
e3d83d8e54 rockchip: rk322x: use defconfig for SYS_MALLOC_F_LEN
There is no difference in rk322x board use for SYS_MALLOC_F_LEN,
so we can use default value.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
476dcb6b43 rockchip: Kconfig: move ROCKCHIP_BOOT_MODE_REG to soc Kconfig
Rockchip SoCs have different ROCKCHIP_BOOT_MODE_REG value,
move it to SoC's own Kconfig, and add address for rk3128 and
rk3328 so that all SoCs have available address.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
c83b5a2c53 rockchip: Kconfig: move rk3399 config into its Kconfig
Each SoC have its config setting and its Kconfig, move
the specific setting to its own Kconfig file.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
97fd39c69e rockchip: Kconfig: move rk3368 config into its Kconfig
Each SoC have its config setting and its Kconfig, move
the specific setting to its own Kconfig file.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
5959126771 rockchip: Kconfig: move rk3288 config into its Kconfig
Each SoC have its config setting and its Kconfig, move
the specific setting to its own Kconfig file.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
45c1d34157 rockchip: Kconfig: move rk322x config into its Kconfig
Each SoC have its config setting and its Kconfig, move
the specific setting to its own Kconfig file.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
5e283876f1 rockchip: fixup board choice in Kconfig
Kconfig for board target select is choice option, fixup for
rk3036, rk3288 and rv1108.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
c8851c9d18 rockchip: remove redundant pinctrl header including
No code is using this header file, remove it.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
0e9802095d rockchip: rk3288: remove pinctrl init in spl_board_init
The pinctrl will default init the io while driver is probe
with new pinctrl driver.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
fcb1964a5e rockchip: rk3188: remove pinctrl init in spl_board_init
The pinctrl will default init the io while driver is probe
with new pinctrl driver.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Kever Yang
7958a85bca rockchip: rk3399: remove pinctrl init in spl_board_init
The pinctrl will default init the io while driver is probe
with new pinctrl driver.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
852f6ddd76 rockchip: dts: rk3399: rock-pi-4: Use LPDDR4-100 dtsi
Use LPDDR4-100 sdram timings dtsi for RockPI-4 board.

All these timings are processed during TPL stage of rock-pi-4 board,
bootchain. This make TPL would replace rockchip in house rkbin in
current bootchain.

Bootchain after and before this change:

   TPL -> SPL -> U-Boot proper

 rkbin -> SPL -> U-Boot proper

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
9a7b8db9f0 rockchip: dts: rk3399: nanopi-neo4: Use DDR3-1866 dtsi
Use DDR3-1866 2GB ddr timings dtsi for 1GB NanoPi Neo4 board.

Since sdram rk3399 support dynamic stride and rank detection it
can able to detect 1GB ddr eventough the timings are meant for
dual channel, 2GB size.

Bootchain after and before this change are:

 TPL -> SPL -> U-Boot proper

 rkbin -> SPL -> U-Boot proper

This certainly fix the second channel data training initialization
since we have dynamic rank, stride where second channel capabilities
are clear or memset to 0.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
a153b034df rockchip: dts: rk3399: rockpro64: Use LPDDR4-100 dtsi
Use LPDDR4-100 sdram timings dtsi for Rockpro64 board.

All these timings are processed during TPL stage of rockpro64 board,
bootchain. This make TPL would replace rockchip in house rkbin in
current bootchain.

Bootchain after and before this change:

   TPL -> SPL -> U-Boot proper

 rkbin -> SPL -> U-Boot proper

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:44 +08:00
Jagan Teki
f797651f80 rockchip: dts: rk3399: Add LPDDR4-100 timings
Add sdram timings for LPDDR4-100 via rk3399-sdram-lpddr4-100.dtsi file.
all timings are dumped from rkbin/bin/rk33/rk3399_ddr_800MHz_v1.20.bin

Associated LPDDR4 board -u-boot.dtsi can include this to make these
timings available during SPL or TPL stages.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:41 +08:00
Jagan Teki
ecd8136e52 configs: rock-pi-4: Enable LPDDR4 support
Due to foot-print issues, we have LPDDR4 code can be
marked as CONFIG_RAM_RK3399_LPDDR4.

So, enable it for Rock-PI-4 board.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:38 +08:00
Jagan Teki
f0e0ab7727 configs: rockpro64: Enable LPDDR4 support
Due to foot-print issues, we have LPDDR4 code can be
marked as CONFIG_RAM_RK3399_LPDDR4.

So, enable it for Rockpro64 board.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:35 +08:00
Jagan Teki
c36abd087a ram: rk3399: Add lpddr4 set rate support
Unlike rest of dram type chips, LPDDR4 initialization start
with at board selected frequency (say 50MHz) and then it
switches into 400MHz and 800MHz simultaneously to make the
proper sequence work on each channel with associated training.

The lpddr4 set rate sequnce will follow by setting lpddr4
- dq out
- ca odt
- MR3
- MR12
- MR14
registers sets in sequential order.

Here is sameple log about LPDDR4-100 init sequence in Rockpro64:

Channel 0: LPDDR4, 50MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
Channel 1: LPDDR4, 50MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
256B stride
channel 0 training pass
channel 1 training pass
change freq to 400 MHz 0, 1
channel 0 training pass
channel 1 training pass
change freq to 800 MHz 1, 0

This patch add support to this init sequence via lpddr4 set rate
by taking sdram timing parameters from 400, 800 .inc files.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
(Fix travis error, use one ret instead of ret[2] in set_ctrl)
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
1dd1cb6253 ram: rk3399: Add set_rate sdram rk3399 ops
DDR set rate can be even required for lpddr4 and we
need to keep the lpddr4 code to compile only for relevant
boards which do support lpddr4.

For this requirement, and for code readability handle
data training via sdram_rk3399_ops with .set_rate and
same will update in future while supporting lpddr4 code.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:32 +08:00
Jagan Teki
dd2c633b2a ram: rk3399: Add LPPDDR4-800 timings inc
LPDDR4 initialization start with at board selected frequency
and then it switches into 400MHz and 800MHz simultaneously to
make the proper sequence work on each channel with associated
training.

So, add LPDDR4-800 timings inc file in driver area so-that
these timings will take during LPDDR4 initialization phase.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:30 +08:00
Jagan Teki
4f3cc17d38 ram: rk3399: Add LPPDDR4-400 timings inc
LPDDR4 initialization start with at board selected frequency
and then it switches into 400MHz and 800MHz simultaneously to
make the proper sequence work on each channel with associated
training.

So, add LPDDR4-400 timings inc file in driver area so-that
these timings will take during LPDDR4 initialization phase.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:27 +08:00
Jagan Teki
f556d75aed clk: rockchip: rk3399: Set 400MHz ddr clock
Add support for setting 400MHz ddr clock.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:25 +08:00
Jagan Teki
0956568637 clk: rockchip: rk3399: Set 50MHz ddr clock
Add support for setting 50MHz ddr clock.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:22 +08:00
Jagan Teki
ab0ce36a16 rockchip: dts: rk3399: Add u-boot, dm-pre-reloc for pmu
Add u-boot,dm-pre-reloc property for pmu in rk3399-u-boot.dtsi
so-that SPL can access pmu.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:20 +08:00
Jagan Teki
845a31ea2c rockchip: rk3399: syscon: Add pmu support
Add pmu compatible with relevant U_BOOT_DRIVER for rk3399
via syscon rk3399 driver.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:17 +08:00
Jagan Teki
614d8ca438 arm: include: rockchip: Add rk3399 pmu file
Add pmu header file for rk3399 SoC, this will help
to configure pmu in sdram driver.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:13 +08:00
Jagan Teki
a0ded6d317 ram: rk3399: Add LPPDR4 mr detection
Like data training in other sdram types, mr detection need
to taken care for lpddr4 with looped rank and associated
channel to make sure the proper configuration held.

Once the mr detection successful for active and configured
rank with channel number, the same can later reused during
actual LPDDR4 initialization.

So, add code to support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:10 +08:00
Jagan Teki
299deecf4a ram: rk3399: Handle data training via ops
data training can be even required for lpddr4 and we
need to keep the lpddr4 code to compile only for relevant
boards which do support lpddr4.

For this requirement, and for code readability handle
data training via sdram_rk3399_ops and same will update
in future while supporting lpddr4 code.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:07 +08:00
Jagan Teki
e6ae37a007 ram: rk3399: Simplify data training first argument
data training is using chan_info as first argument with
channel number as second argument instead of that use
dram_info as first argument so-that we can get the
chan_info at data training definition.

This was the argument handling is meaningful, readable
and it would help to add similar data training for
lpddr4 in future.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-21 00:00:01 +08:00
Jagan Teki
e939f92eae ram: rk3399: Update lpddr4 vref_mode_ac
Update vref_mode_ac for lpddr4 based on VDDQ/3/2=16.8%

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
274c33737b ram: rk3399: Update lpddr4 mode_sel based on io settings
The mode_sel on lpddr4 value is depending on IO settings
of rd_vref.

Add support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
95be76eb5c ram: rk3399: Update lpddr4 vref based on io settings
The vref_mode_dq, vref_value_dq on lpddr4 value is depending
on IO settings of rd_vref.

Add support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
4eceda01d5 ram: rk3399: Get lpddr4 tsel_rd_en from io settings
For base.odt 1 the lpddr4 tsel_rd_en value is depending
on IO settings of rd_odt_en.

Add support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
f288d54936 ram: rk3399: Configure soc odt support
CTL 145, 146, 159, 160 registers are used to configure
soc odt on rk3399.

These soc odt values are updated from CS0_MR22_VAL and
CS1_MR22_VAL and for lpddr4 these values ORed with
tsel_rd_select_n.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
aa30aae8b4 ram: rk3399: Add tsel control clock drive
tsel contrl clock drives are required to configure PHY
929, 939 controls drive settings.

Add support for these control clock for all dramtype
sdrams.

Thse control clock drives are configure via tsel_ckcs_select_p
and tsel_ckcs_select_n variables.

tsel_ckcs_select_n is PHY_DRV_ODT_34_3 value where as
tsel_ckcs_select_p is retrived from IO settings for lpddr4
and rest uses PHY_DRV_ODT_34_3.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
2fb2de33b2 ram: sdram: Configure lpddr4 tsel rd, wr based on IO settings
Now we have IO settings available for all supported sdram
frequencies, so retrieve these IO settings and make used
for LPDDR4 ds odt configuration.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
74109de3c2 ram: rk3399: Add IO settings
Add IO settings for dram ctl and phy.

IO settings are useful for configuring ctl, phy odt, vref,
mr5, mode select and other needed input output operations
for lpddr4 or any other dramtype sdram.

Right now, this patch added IO setting for all supported
sdram frequencies.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
740409804e ram: rk3399: Don't disable dfi dram clk for lpddr4, rank 1
The hardware for LPDDR4 with
- CLK0P/N connect to lower 16-bits
- CLK1P/N connect to higher 16-bits

and usually dfi dram clk is configured via CLK1P/N, so
disabling dfi dram clk will disable the CLK1P/N as well.

So, add patch to not to disable dfi dram clk for lpddr4,
with rank 1.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
66912baa0f ram: rk3399: Configure tsel write ca for lpddr4
tsel write ca_p and ca_n values need to write on PHY 544, 672
and 800 to configure ds odt.

Configure the same PHY register for lpddr4 would require a mask
value of (300 << 8).

Add support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
4e9de9eba8 ram: rk3399: Map chipselect for lpddr4
Assign desired cs_map values for lpddr4 during set memory map.

Initial cs_map values is based on the sdram parameters, so
the same will adjusted based dramtype as LPDDR4.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
d3d0099ca6 ram: rk3399: Configure PHY RX_CM_INPUT for lpddr4
Configure PHY RX_CM_INPUT for lpddr4 during phy IO config.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
f9f32d61a6 ram: rk3399: Configure SLEWP_EN, SLEWN_EN for lpddr4
Configure SLEWP_EN, SLEWN_EN for lpddr4 during phy IO config.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
881860fd34 ram: rk3399: Configure BOOSTP_EN, BOOSTN_EN for lpddr4
Configure BOOSTP_EN, BOOSTN_EN for lpddr4 during phy IO config.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
009fe1bac9 ram: rk3399: Configure PHY_898, PHY_919 for lpddr4
PHY_898, PHY_919 would require to configure PHY LP4 boot
pll control and ca for lpddr4.

So, configure the same in pctl_cfg for LPDDR4.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
47627c8a5c ram: rk3399: Avoid two channel ZQ Cal Start at the same time
It is possible in lpddr4 dram, where both the channels would
start at same time with ZQ Cal Start. If it uses ZQ Call start
then it will use RZQ.

For example LPDDR4 366 Dual-Die, Quad-Channel Package, RZQ maybe
connect to both channel. If ZQ Cal Start at the same time,
it will use the same RZQ.

It is not a problem of using RZQ in both the channels, but can not
use at the same time.

So, to avoid this, we have an option of dram tINIT3 value for
increasing the frequency for channel 1.

This patch increase the available tINIT3 with existing running
dram frequency.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
5cbc866981 ram: rk3399: Don't wait for PLL lock in lpddr4
lpddr4 has PLL bypass mode during phy initialization phase,
which does all pll configurations.

So no need to wait explicitly during pctl config.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
6cbd2426b3 ram: rk3399: Move mode_sel assignment
mode_sel assignment is based on dram type.

In phy_io_config, already have vref setting based
on the dram type, so move this mode_sel assignment
on vref setting area.

No functionality change.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
c716bf67f5 ram: rk3399: Add lpddr4 rank mask for wdql training
Add rank_mask based on the rank number for lpddr4.

This would keep the wdql data training loop based on the
desired rank mask value instead of looping for all values.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
3dae87da89 ram: rk3399: Add lpddr4 rank mask for ca training
Add rank_mask based on the rank number for lpddr4.

This would keep the ca data training loop based on the
desired rank mask value instead of looping for all values.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00
Jagan Teki
b6cf08949d ram: rockchip: Kconfig: Add RK3399 LPDDR4 entry
Supporting LPDDR4 code support in RK3399 would increases
the size of SPL/TPL.

So add kconfig entry for RK3399 LPDDR4 code so-that
the boards have LPDDR4 can enable them via defconfig.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
2019-07-20 23:59:44 +08:00