From: Minal Shah minalks...@gmail.com
DRA7xx platform has in-build GPMC and ELM h/w engines which can be used
for accessing externel NAND flash device. This patch:
- adds generic DT binding in dra7.dtsi for enabling GPMC and ELM h/w engines
- adds DT binding for Micron NAND Flash (MT29F2G16AADWP) present on dra7-evm
*Important*
On DRA7 EVM, GPMC_WPN and NAND_BOOTn are controlled by DIP switch
So following board settings are required for NAND device detection:
SW5.9 (GPMC_WPN) = LOW
SW5.1 (NAND_BOOTn) = HIGH
Signed-off-by: Minal Shah minalks...@gmail.com
Signed-off-by: Pekon Gupta pe...@ti.com
---
arch/arm/boot/dts/dra7-evm.dts | 117 +
arch/arm/boot/dts/dra7.dtsi| 20 +++
2 files changed, 137 insertions(+)
diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
index 5babba0..7b4e6f5 100644
--- a/arch/arm/boot/dts/dra7-evm.dts
+++ b/arch/arm/boot/dts/dra7-evm.dts
@@ -93,6 +93,37 @@
0x24c (PIN_INPUT_SLEW | MUX_MODE0) /* uart3_txd */
;
};
+
+ nand_flash_x16: nand_flash_x16 {
+ /* On DRA7 EVM, GPMC_WPN and NAND_BOOTn comes from DIP switch
+* So NAND flash requires following switch settings:
+* SW5.9 (GPMC_WPN) = LOW
+* SW5.1 (NAND_BOOTn) = HIGH */
+ pinctrl-single,pins =
+ 0x0 (PIN_INPUT | MUX_MODE0)/* gpmc_ad0
*/
+ 0x4 (PIN_INPUT | MUX_MODE0)/* gpmc_ad1
*/
+ 0x8 (PIN_INPUT | MUX_MODE0)/* gpmc_ad2
*/
+ 0xc (PIN_INPUT | MUX_MODE0)/* gpmc_ad3
*/
+ 0x10(PIN_INPUT | MUX_MODE0)/* gpmc_ad4
*/
+ 0x14(PIN_INPUT | MUX_MODE0)/* gpmc_ad5
*/
+ 0x18(PIN_INPUT | MUX_MODE0)/* gpmc_ad6
*/
+ 0x1c(PIN_INPUT | MUX_MODE0)/* gpmc_ad7
*/
+ 0x20(PIN_INPUT | MUX_MODE0)/* gpmc_ad8
*/
+ 0x24(PIN_INPUT | MUX_MODE0)/* gpmc_ad9
*/
+ 0x28(PIN_INPUT | MUX_MODE0)/* gpmc_ad10
*/
+ 0x2c(PIN_INPUT | MUX_MODE0)/* gpmc_ad11
*/
+ 0x30(PIN_INPUT | MUX_MODE0)/* gpmc_ad12
*/
+ 0x34(PIN_INPUT | MUX_MODE0)/* gpmc_ad13
*/
+ 0x38(PIN_INPUT | MUX_MODE0)/* gpmc_ad14
*/
+ 0x3c(PIN_INPUT | MUX_MODE0)/* gpmc_ad15
*/
+ 0xD8(PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_wait0
*/
+ 0xCC(PIN_OUTPUT | MUX_MODE0)/* gpmc_wen
*/
+ 0xB4(PIN_OUTPUT_PULLUP | MUX_MODE0) /* gpmc_csn0
*/
+ 0xC4(PIN_OUTPUT | MUX_MODE0)/*
gpmc_advn_ale */
+ 0xC8(PIN_OUTPUT | MUX_MODE0)/* gpmc_oen_ren
*/
+ 0xD0(PIN_OUTPUT | MUX_MODE0)/*
gpmc_be0n_cle */
+ ;
+ };
};
i2c1 {
@@ -273,3 +304,89 @@
cpu0 {
cpu0-supply = smps123_reg;
};
+
+elm {
+ status = okay;
+};
+
+gpmc {
+ status = okay;
+ pinctrl-names = default;
+ pinctrl-0 = nand_flash_x16;
+ ranges = 0 0 0x0800 0x1000;
+ nand@0,0 {
+ reg = 0 0 0;
+ ti,nand-ecc-opt = bch8;
+ ti,elm-id = elm;
+ nand-bus-width = 16;
+ gpmc,device-width = 2;
+ gpmc,sync-clk-ps = 0;
+ gpmc,cs-on-ns = 0;
+ gpmc,cs-rd-off-ns = 40;
+ gpmc,cs-wr-off-ns = 40;
+ gpmc,adv-on-ns = 0;
+ gpmc,adv-rd-off-ns = 30;
+ gpmc,adv-wr-off-ns = 30;
+ gpmc,we-on-ns = 5;
+ gpmc,we-off-ns = 25;
+ gpmc,oe-on-ns = 2;
+ gpmc,oe-off-ns = 20;
+ gpmc,access-ns = 20;
+ gpmc,wr-access-ns = 40;
+ gpmc,rd-cycle-ns = 40;
+ gpmc,wr-cycle-ns = 40;
+ gpmc,wait-on-read = true;
+ gpmc,wait-on-write = true;
+ gpmc,bus-turnaround-ns = 0;
+ gpmc,cycle2cycle-delay-ns = 0;
+ gpmc,clk-activation-ns = 0;
+ gpmc,wait-monitoring-ns = 0;
+ gpmc,wr-data-mux-bus-ns = 0;
+ /* MTD partition table */
+ /* All SPL-* partitions are sized to minimal length
+* which can be independently programmable. For
+* NAND flash this is equal to size of erase-block */
+ #address-cells = 1;
+ #size-cells = 1;
+ partition@0 {
+
