OMAP3 EVM: Add touchscreen support

Add touchscreen support for OMAP3 EVM
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-omap3evm.c

@@ -19,6 +19,8 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/ads7846.h>
 
 #include <asm/hardware.h>
 #include <asm/mach-types.h>
@@ -31,6 +33,7 @@
 #include <asm/arch/usb-musb.h>
 #include <asm/arch/usb-ehci.h>
 #include <asm/arch/common.h>
+#include <asm/arch/mcspi.h>
 
 static struct omap_uart_config omap3_evm_uart_config __initdata = {
 	.enabled_uarts	= ((1 << 0) | (1 << 1) | (1 << 2)),
@@ -65,6 +68,44 @@ static struct platform_device omap3_evm_twl4030rtc_device = {
 	.id		= -1,
 };
 
+static void ads7846_dev_init(void)
+{
+	if (omap_request_gpio(OMAP3_EVM_TS_GPIO) < 0)
+		printk(KERN_ERR "can't get ads7846 pen down GPIO\n");
+
+	omap_set_gpio_direction(OMAP3_EVM_TS_GPIO, 1);
+
+	omap_set_gpio_debounce(OMAP3_EVM_TS_GPIO, 1);
+	omap_set_gpio_debounce_time(OMAP3_EVM_TS_GPIO, 0xa);
+}
+
+static int ads7846_get_pendown_state(void)
+{
+	return !omap_get_gpio_datain(OMAP3_EVM_TS_GPIO);
+}
+
+struct ads7846_platform_data ads7846_config = {
+	.get_pendown_state	= ads7846_get_pendown_state,
+	.keep_vref_on		= 1,
+};
+
+static struct omap2_mcspi_device_config ads7846_mcspi_config = {
+	.turbo_mode	= 0,
+	.single_channel	= 1,  /* 0: slave, 1: master */
+};
+
+struct spi_board_info omap3evm_spi_board_info[] = {
+	[0] = {
+		.modalias		= "ads7846",
+		.bus_num		= 1,
+		.chip_select		= 0,
+		.max_speed_hz		= 1500000,
+		.controller_data	= &ads7846_mcspi_config,
+		.irq			= OMAP_GPIO_IRQ(OMAP3_EVM_TS_GPIO),
+		.platform_data		= &ads7846_config,
+	},
+};
+
 static void __init omap3_evm_init_irq(void)
 {
 	omap2_init_common_hw();
@@ -90,11 +131,16 @@ static void __init omap3_evm_init(void)
 	platform_add_devices(omap3_evm_devices, ARRAY_SIZE(omap3_evm_devices));
 	omap_board_config = omap3_evm_config;
 	omap_board_config_size = ARRAY_SIZE(omap3_evm_config);
+
+	spi_register_board_info(omap3evm_spi_board_info,
+				ARRAY_SIZE(omap3evm_spi_board_info));
+
 	omap_serial_init();
 	hsmmc_init();
 	usb_musb_init();
 	usb_ehci_init();
 	omap3evm_flash_init();
+	ads7846_dev_init();
 }
 
 arch_initcall(omap3_evm_i2c_init);

include/asm-arm/arch-omap/board-omap3evm.h

@@ -31,6 +31,7 @@
 
 extern void omap3evm_flash_init(void);
 
+#define OMAP3_EVM_TS_GPIO	175
 #define ONENAND_MAP		0x20000000
 
 #endif /* __ASM_ARCH_OMAP3_EVM_H */