[ARM] pxa: add GPIO expander (PCA9539) support for zylonite

     And also reserve 32 IRQs for the two GPIO expanders.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 44 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/zylonite_pxa300.c b/arch/arm/mach-pxa/zylonite_pxa300.c
index 6f7ae972b8db..75bf61f1f1c3 100644
--- a/arch/arm/mach-pxa/zylonite_pxa300.c
+++ b/arch/arm/mach-pxa/zylonite_pxa300.c
@@ -16,9 +16,12 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/i2c/pca953x.h>
 
 #include <asm/gpio.h>
 #include <asm/arch/mfp-pxa300.h>
+#include <asm/arch/i2c.h>
 #include <asm/arch/zylonite.h>
 
 #include "generic.h"
@@ -109,6 +112,10 @@ static mfp_cfg_t common_mfp_cfg[] __initdata = {
         GPIO12_MMC2_DAT3,
         GPIO13_MMC2_CLK,
         GPIO14_MMC2_CMD,
+
+        /* Standard I2C */
+        GPIO21_I2C_SCL,
+        GPIO22_I2C_SDA,
 };
 
 static mfp_cfg_t pxa300_mfp_cfg[] __initdata = {
@@ -192,6 +199,39 @@ static void __init zylonite_detect_lcd_panel(void)
                 pxa3xx_mfp_write(lcd_detect_pins[i], mfpr_save[i]);
 }
 
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+static struct pca953x_platform_data gpio_exp[] = {
+        [0] = {
+                .gpio_base      = 128,
+        },
+        [1] = {
+                .gpio_base      = 144,
+        },
+};
+
+struct i2c_board_info zylonite_i2c_board_info[] = {
+        {
+                .type           = "pca9539",
+                .addr           = 0x74,
+                .platform_data  = &gpio_exp[0],
+                .irq            = IRQ_GPIO(18),
+        }, {
+                .type           = "pca9539",
+                .addr           = 0x75,
+                .platform_data  = &gpio_exp[1],
+                .irq            = IRQ_GPIO(19),
+        },
+};
+
+static void __init zylonite_init_i2c(void)
+{
+        pxa_set_i2c_info(NULL);
+        i2c_register_board_info(0, ARRAY_AND_SIZE(zylonite_i2c_board_info));
+}
+#else
+static inline void zylonite_init_i2c(void) {}
+#endif
+
 void __init zylonite_pxa300_init(void)
 {
         if (cpu_is_pxa300() || cpu_is_pxa310()) {
@@ -207,6 +247,8 @@ void __init zylonite_pxa300_init(void)
 
                 /* WM9713 IRQ */
                 wm9713_irq = mfp_to_gpio(MFP_PIN_GPIO26);
+
+                zylonite_init_i2c();
         }
 
         if (cpu_is_pxa300()) {
diff --git a/include/asm-arm/arch-pxa/irqs.h b/include/asm-arm/arch-pxa/irqs.h
index b6c8fe377683..d85736048461 100644
--- a/include/asm-arm/arch-pxa/irqs.h
+++ b/include/asm-arm/arch-pxa/irqs.h
@@ -184,6 +184,8 @@
       defined(CONFIG_MACH_PCM027) || \
       defined(CONFIG_MACH_MAGICIAN)
 #define NR_IRQS                 (IRQ_BOARD_END)
+#elif defined(CONFIG_MACH_ZYLONITE)
+#define NR_IRQS                 (IRQ_BOARD_START + 32)
 #else
 #define NR_IRQS                 (IRQ_BOARD_START)
 #endif