[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>
diff --git a/arch/arm/mach-pxa/zylonite_pxa300.c b/arch/arm/mach-pxa/zylonite_pxa300.c
index 6f7ae97..75bf61f 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 @@
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 @@
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 @@
/* WM9713 IRQ */
wm9713_irq = mfp_to_gpio(MFP_PIN_GPIO26);
+
+ zylonite_init_i2c();
}
if (cpu_is_pxa300()) {