ARM: dts: am335x: Provide NAND ready pin

On these boards NAND ready pin status is avilable over
GPMC_WAIT0 pin.

For NAND we don't use GPMC wait pin monitoring but
get the NAND Ready/Busy# status using GPIOlib.
GPMC driver provides the WAIT0 pin status over GPIOlib.

Read speed increases from 7869 KiB/ to 8875 KiB/s
and write speed was unchanged at 5100 KiB/s.

Measured using mtd_speedtest.ko on am335x-evm.

Cc: Teresa Remmet <t.remmet@phytec.de>
Cc: Ilya Ledvich <ilya@compulab.co.il>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Rostislav Lisovy <lisovy@gmail.com>
Cc: Enric Balletbo i Serra <eballetbo@iseebcn.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-baltos-ir5221.dts

@@ -241,6 +241,7 @@ nand@0,0 {
 		interrupt-parent = <&gpmc>;
 		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
 			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
 		nand-bus-width = <8>;
 		ti,nand-ecc-opt = "bch8";
 		ti,nand-xfer-type = "polled";

arch/arm/boot/dts/am335x-chilisom.dtsi

@@ -214,6 +214,7 @@ nand@0,0 {
 		interrupt-parent = <&gpmc>;
 		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
 			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
 		ti,nand-ecc-opt = "bch8";
 		ti,elm-id = <&elm>;
 		nand-bus-width = <8>;

arch/arm/boot/dts/am335x-cm-t335.dts

@@ -411,6 +411,7 @@ nand@0,0 {
 		interrupt-parent = <&gpmc>;
 		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
 			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
 		ti,nand-ecc-opt = "bch8";
 		ti,elm-id = <&elm>;
 		nand-bus-width = <8>;

arch/arm/boot/dts/am335x-evm.dts

@@ -524,6 +524,7 @@ nand@0,0 {
 		interrupt-parent = <&gpmc>;
 		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
 			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
 		ti,nand-ecc-opt = "bch8";
 		ti,elm-id = <&elm>;
 		nand-bus-width = <8>;

arch/arm/boot/dts/am335x-igep0033.dtsi

@@ -135,6 +135,7 @@ nand@0,0 {
 		interrupt-parent = <&gpmc>;
 		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
 			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
 		nand-bus-width = <8>;
 		ti,nand-ecc-opt = "bch8";
 		gpmc,device-width = <1>;

arch/arm/boot/dts/am335x-phycore-som.dtsi

@@ -171,6 +171,7 @@ nandflash: nand@0,0 {
 		interrupt-parent = <&gpmc>;
 		interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
 			     <1 IRQ_TYPE_NONE>;	/* termcount */
+		rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
 		nand-bus-width = <8>;
 		ti,nand-ecc-opt = "bch8";
 		gpmc,device-nand = "true";