iMX51: introduce IMX_GPIO_NR

Currently, to define a GPIO number, we're using something like :

#define EFIKAMX_PCBID0         (2*32 + 16)

to define GPIO 3 16.

This is not really readable and it's error prone imho (note the 3 vs 2).
So, I'm introducing a new macro to define this in a better way. Now, the
code sample become :

#define EFIKAMX_PCBID0         IMX_GPIO_NR(3, 16)

v2:
- move to gpio.h
- add parens & spaces
- switch to IMX_GPIO_NR instead of MX51_GPIO_NR

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Cc: Amit Kucheria <amit.kucheria@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx5/board-cpuimx51.c

@@ -40,11 +40,11 @@
 #include "devices-imx51.h"
 #include "devices.h"
 
-#define CPUIMX51_USBH1_STP	(0*32 + 27)
-#define CPUIMX51_QUARTA_GPIO	(2*32 + 28)
-#define CPUIMX51_QUARTB_GPIO	(2*32 + 25)
-#define CPUIMX51_QUARTC_GPIO	(2*32 + 26)
-#define CPUIMX51_QUARTD_GPIO	(2*32 + 27)
+#define CPUIMX51_USBH1_STP	IMX_GPIO_NR(1, 27)
+#define CPUIMX51_QUARTA_GPIO	IMX_GPIO_NR(3, 28)
+#define CPUIMX51_QUARTB_GPIO	IMX_GPIO_NR(3, 25)
+#define CPUIMX51_QUARTC_GPIO	IMX_GPIO_NR(3, 26)
+#define CPUIMX51_QUARTD_GPIO	IMX_GPIO_NR(3, 27)
 #define CPUIMX51_QUARTA_IRQ	(MXC_INTERNAL_IRQS + CPUIMX51_QUARTA_GPIO)
 #define CPUIMX51_QUARTB_IRQ	(MXC_INTERNAL_IRQS + CPUIMX51_QUARTB_GPIO)
 #define CPUIMX51_QUARTC_IRQ	(MXC_INTERNAL_IRQS + CPUIMX51_QUARTC_GPIO)

arch/arm/mach-mx5/board-cpuimx51sd.c

@@ -43,19 +43,19 @@
 #include "devices-imx51.h"
 #include "devices.h"
 
-#define USBH1_RST		(1*32 + 28)
-#define ETH_RST			(1*32 + 31)
-#define TSC2007_IRQGPIO		(2*32 + 12)
-#define CAN_IRQGPIO		(0*32 + 1)
-#define CAN_RST			(3*32 + 15)
-#define CAN_NCS			(3*32 + 24)
-#define CAN_RXOBF		(0*32 + 4)
-#define CAN_RX1BF		(0*32 + 6)
-#define CAN_TXORTS		(0*32 + 7)
-#define CAN_TX1RTS		(0*32 + 8)
-#define CAN_TX2RTS		(0*32 + 9)
-#define I2C_SCL			(3*32 + 16)
-#define I2C_SDA			(3*32 + 17)
+#define USBH1_RST		IMX_GPIO_NR(2, 28)
+#define ETH_RST			IMX_GPIO_NR(2, 31)
+#define TSC2007_IRQGPIO		IMX_GPIO_NR(3, 12)
+#define CAN_IRQGPIO		IMX_GPIO_NR(1, 1)
+#define CAN_RST			IMX_GPIO_NR(4, 15)
+#define CAN_NCS			IMX_GPIO_NR(4, 24)
+#define CAN_RXOBF		IMX_GPIO_NR(1, 4)
+#define CAN_RX1BF		IMX_GPIO_NR(1, 6)
+#define CAN_TXORTS		IMX_GPIO_NR(1, 7)
+#define CAN_TX1RTS		IMX_GPIO_NR(1, 8)
+#define CAN_TX2RTS		IMX_GPIO_NR(1, 9)
+#define I2C_SCL			IMX_GPIO_NR(4, 16)
+#define I2C_SDA			IMX_GPIO_NR(4, 17)
 
 /* USB_CTRL_1 */
 #define MX51_USB_CTRL_1_OFFSET		0x10
@@ -243,7 +243,7 @@ static struct spi_board_info cpuimx51sd_spi_device[] = {
 		.mode		= SPI_MODE_0,
 		.chip_select     = 0,
 		.platform_data   = &mcp251x_info,
-		.irq             = gpio_to_irq(0 * 32 + 1)
+		.irq             = gpio_to_irq(CAN_IRQGPIO)
 	},
 };
 

arch/arm/mach-mx5/board-mx51_babbage.c

@@ -38,13 +38,13 @@
 #include "devices.h"
 #include "cpu_op-mx51.h"
 
-#define BABBAGE_USB_HUB_RESET	(0*32 + 7)	/* GPIO_1_7 */
-#define BABBAGE_USBH1_STP	(0*32 + 27)	/* GPIO_1_27 */
-#define BABBAGE_PHY_RESET	(1*32 + 5)	/* GPIO_2_5 */
-#define BABBAGE_FEC_PHY_RESET	(1*32 + 14)	/* GPIO_2_14 */
-#define BABBAGE_POWER_KEY	(1*32 + 21)	/* GPIO_2_21 */
-#define BABBAGE_ECSPI1_CS0	(3*32 + 24)	/* GPIO_4_24 */
-#define BABBAGE_ECSPI1_CS1	(3*32 + 25)	/* GPIO_4_25 */
+#define BABBAGE_USB_HUB_RESET	IMX_GPIO_NR(1, 7)
+#define BABBAGE_USBH1_STP	IMX_GPIO_NR(1, 27)
+#define BABBAGE_PHY_RESET	IMX_GPIO_NR(2, 5)
+#define BABBAGE_FEC_PHY_RESET	IMX_GPIO_NR(2, 14)
+#define BABBAGE_POWER_KEY	IMX_GPIO_NR(2, 21)
+#define BABBAGE_ECSPI1_CS0	IMX_GPIO_NR(4, 24)
+#define BABBAGE_ECSPI1_CS1	IMX_GPIO_NR(4, 25)
 
 /* USB_CTRL_1 */
 #define MX51_USB_CTRL_1_OFFSET			0x10

arch/arm/mach-mx5/board-mx51_efikamx.c

@@ -43,22 +43,22 @@
 
 #define	MX51_USB_PLL_DIV_24_MHZ	0x01
 
-#define EFIKAMX_PCBID0		(2*32 + 16)
-#define EFIKAMX_PCBID1		(2*32 + 17)
-#define EFIKAMX_PCBID2		(2*32 + 11)
+#define EFIKAMX_PCBID0		IMX_GPIO_NR(3, 16)
+#define EFIKAMX_PCBID1		IMX_GPIO_NR(3, 17)
+#define EFIKAMX_PCBID2		IMX_GPIO_NR(3, 11)
 
-#define EFIKAMX_BLUE_LED	(2*32 + 13)
-#define EFIKAMX_GREEN_LED	(2*32 + 14)
-#define EFIKAMX_RED_LED		(2*32 + 15)
+#define EFIKAMX_BLUE_LED	IMX_GPIO_NR(3, 13)
+#define EFIKAMX_GREEN_LED	IMX_GPIO_NR(3, 14)
+#define EFIKAMX_RED_LED		IMX_GPIO_NR(3, 15)
 
-#define EFIKAMX_POWER_KEY	(1*32 + 31)
+#define EFIKAMX_POWER_KEY	IMX_GPIO_NR(2, 31)
 
-#define EFIKAMX_SPI_CS0		(3*32 + 24)
-#define EFIKAMX_SPI_CS1		(3*32 + 25)
+#define EFIKAMX_SPI_CS0		IMX_GPIO_NR(4, 24)
+#define EFIKAMX_SPI_CS1		IMX_GPIO_NR(4, 25)
 
 /* board 1.1 doesn't have same reset gpio */
-#define EFIKAMX_RESET1_1	(2*32 + 2)
-#define EFIKAMX_RESET		(0*32 + 4)
+#define EFIKAMX_RESET1_1	IMX_GPIO_NR(3, 2)
+#define EFIKAMX_RESET		IMX_GPIO_NR(1, 4)
 
 /* the pci ids pin have pull up. they're driven low according to board id */
 #define MX51_PAD_PCBID0	IOMUX_PAD(0x518, 0x130, 3, 0x0,   0, PAD_CTL_PUS_100K_UP)

arch/arm/mach-mx5/eukrea_mbimx51-baseboard.c

@@ -33,12 +33,12 @@
 #include "devices-imx51.h"
 #include "devices.h"
 
-#define MBIMX51_TSC2007_GPIO	(2*32 + 30)
+#define MBIMX51_TSC2007_GPIO	IMX_GPIO_NR(3, 30)
 #define MBIMX51_TSC2007_IRQ	(MXC_INTERNAL_IRQS + MBIMX51_TSC2007_GPIO)
-#define MBIMX51_LED0		(2*32 + 5)
-#define MBIMX51_LED1		(2*32 + 6)
-#define MBIMX51_LED2		(2*32 + 7)
-#define MBIMX51_LED3		(2*32 + 8)
+#define MBIMX51_LED0		IMX_GPIO_NR(3, 5)
+#define MBIMX51_LED1		IMX_GPIO_NR(3, 6)
+#define MBIMX51_LED2		IMX_GPIO_NR(3, 7)
+#define MBIMX51_LED3		IMX_GPIO_NR(3, 8)
 
 static struct gpio_led mbimx51_leds[] = {
 	{

arch/arm/mach-mx5/eukrea_mbimxsd-baseboard.c

@@ -70,8 +70,8 @@ static iomux_v3_cfg_t eukrea_mbimxsd_pads[] = {
 	MX51_PAD_SD1_DATA3__SD1_DATA3,
 };
 
-#define GPIO_LED1	(2 * 32 + 30)
-#define GPIO_SWITCH1	(2 * 32 + 31)
+#define GPIO_LED1	IMX_GPIO_NR(3, 30)
+#define GPIO_SWITCH1	IMX_GPIO_NR(3, 31)
 
 static struct gpio_led eukrea_mbimxsd_leds[] = {
 	{

arch/arm/plat-mxc/include/mach/gpio.h

@@ -23,6 +23,11 @@
 #include <mach/hardware.h>
 #include <asm-generic/gpio.h>
 
+
+/* There's a off-by-one betweem the gpio bank number and the gpiochip */
+/* range e.g. GPIO_1_5 is gpio 5 under linux */
+#define IMX_GPIO_NR(bank, nr)		(((bank) - 1) * 32 + (nr))
+
 /* use gpiolib dispatchers */
 #define gpio_get_value		__gpio_get_value
 #define gpio_set_value		__gpio_set_value