mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 04:23:46 +00:00
3a29afcbbf
Alignment with kernel directory name as it have already bindings for
DDR controllers in the directory:
Documentation/devicetree/bindings/memory-controller
PS: the drivers using RAM u-class should be associated with
this binding directory
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
58 lines
1.5 KiB
Text
58 lines
1.5 KiB
Text
ST, stm32 flexible memory controller Drive
|
|
Required properties:
|
|
- compatible : "st,stm32-fmc"
|
|
- reg : fmc controller base address
|
|
- clocks : fmc controller clock
|
|
u-boot,dm-pre-reloc: flag to initialize memory before relocation.
|
|
|
|
on-board sdram memory attributes:
|
|
- st,sdram-control : parameters for sdram configuration, in this order:
|
|
number of columns
|
|
number of rows
|
|
memory width
|
|
number of intenal banks in memory
|
|
cas latency
|
|
read burst enable or disable
|
|
read pipe delay
|
|
|
|
- st,sdram-timing: timings for sdram, in this order:
|
|
tmrd
|
|
txsr
|
|
tras
|
|
trc
|
|
trp
|
|
trcd
|
|
|
|
There is device tree include file at :
|
|
include/dt-bindings/memory/stm32-sdram.h to define sdram control and timing
|
|
parameters as MACROS.
|
|
|
|
Example:
|
|
fmc: fmc@A0000000 {
|
|
compatible = "st,stm32-fmc";
|
|
reg = <0xA0000000 0x1000>;
|
|
clocks = <&rcc 0 64>;
|
|
u-boot,dm-pre-reloc;
|
|
};
|
|
|
|
&fmc {
|
|
pinctrl-0 = <&fmc_pins>;
|
|
pinctrl-names = "default";
|
|
status = "okay";
|
|
|
|
/* sdram memory configuration from sdram datasheet */
|
|
bank1: bank@0 {
|
|
st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_2
|
|
CAS_3 RD_BURST_EN RD_PIPE_DL_0>;
|
|
st,sdram-timing = /bits/ 8 <TMRD_1 TXSR_60 TRAS_42 TRC_60 TRP_18
|
|
TRCD_18>;
|
|
};
|
|
|
|
/* sdram memory configuration from sdram datasheet */
|
|
bank2: bank@1 {
|
|
st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_2
|
|
CAS_3 RD_BURST_EN RD_PIPE_DL_0>;
|
|
st,sdram-timing = /bits/ 8 <TMRD_1 TXSR_60 TRAS_42 TRC_60 TRP_18
|
|
TRCD_18>;
|
|
};
|
|
}
|