ARM/serial: at91: switch atmel serial to use gpiolib

This passes the errata fix using a GPIO to control the RTS pin
on one of the AT91 chips to use gpiolib instead of the
AT91-specific interfaces. Also remove the reliance on
compile-time #defines and the cpu_* check and rely on the
platform passing down the proper GPIO pin through platform
data.

This is a prerequisite for getting rid of the local GPIO
implementation in the AT91 platform and move toward
multiplatform.

The patch also adds device tree support for getting the
RTS GPIO pin from the device tree on DT boot paths.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mach-at91/at91sam9263_devices.c b/arch/arm/mach-at91/at91sam9263_devices.c
index 4aeadddbc181..97cc2a0d6f90 100644
--- a/arch/arm/mach-at91/at91sam9263_devices.c
+++ b/arch/arm/mach-at91/at91sam9263_devices.c
@@ -1324,6 +1324,7 @@ static struct resource dbgu_resources[] = {
 static struct atmel_uart_data dbgu_data = {
         .use_dma_tx     = 0,
         .use_dma_rx     = 0,            /* DBGU not capable of receive DMA */
+        .rts_gpio       = -EINVAL,
 };
 
 static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -1362,6 +1363,7 @@ static struct resource uart0_resources[] = {
 static struct atmel_uart_data uart0_data = {
         .use_dma_tx     = 1,
         .use_dma_rx     = 1,
+        .rts_gpio       = -EINVAL,
 };
 
 static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -1405,6 +1407,7 @@ static struct resource uart1_resources[] = {
 static struct atmel_uart_data uart1_data = {
         .use_dma_tx     = 1,
         .use_dma_rx     = 1,
+        .rts_gpio       = -EINVAL,
 };
 
 static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -1448,6 +1451,7 @@ static struct resource uart2_resources[] = {
 static struct atmel_uart_data uart2_data = {
         .use_dma_tx     = 1,
         .use_dma_rx     = 1,
+        .rts_gpio       = -EINVAL,
 };
 
 static u64 uart2_dmamask = DMA_BIT_MASK(32);