pmic_fsl: Introduce FSL_PMIC_I2C_LENGTH

Introduce FSL_PMIC_I2C_LENGTH to configure the number of bytes that are used to
communicate with the PMIC via I2C.

Instead of hardcoding the value, pass the number via a configurable option per
PMIC type.

This will be useful for adding support for PMIC MC34704 from Freescale, which
uses only one byte in its I2C protocol.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

drivers/misc/pmic_fsl.c

@@ -26,6 +26,10 @@
 #include <pmic.h>
 #include <fsl_pmic.h>
 
+#if defined(CONFIG_PMIC_FSL_MC13892)
+#define FSL_PMIC_I2C_LENGTH	3
+#endif
+
 #if defined(CONFIG_PMIC_SPI)
 static u32 pmic_spi_prepare_tx(u32 reg, u32 *val, u32 write)
 {
@@ -53,7 +57,7 @@ int pmic_init(void)
 #elif defined(CONFIG_PMIC_I2C)
 	p->interface = PMIC_I2C;
 	p->hw.i2c.addr = CONFIG_SYS_FSL_PMIC_I2C_ADDR;
-	p->hw.i2c.tx_num = 3;
+	p->hw.i2c.tx_num = FSL_PMIC_I2C_LENGTH;
 	p->bus = I2C_PMIC;
 #else
 #error "You must select CONFIG_PMIC_SPI or CONFIG_PMIC_I2C"

include/configs/mx35pdk.h

@@ -68,6 +68,7 @@
 #define CONFIG_PMIC
 #define CONFIG_PMIC_I2C
 #define CONFIG_PMIC_FSL
+#define CONFIG_PMIC_FSL_MC13892
 #define CONFIG_SYS_FSL_PMIC_I2C_ADDR	0x08
 #define CONFIG_RTC_MC13XXX
 

include/configs/mx53loco.h

@@ -93,6 +93,7 @@
 #define CONFIG_PMIC_I2C
 #define CONFIG_DIALOG_PMIC
 #define CONFIG_PMIC_FSL
+#define CONFIG_PMIC_FSL_MC13892
 #define CONFIG_SYS_DIALOG_PMIC_I2C_ADDR	0x48
 #define CONFIG_SYS_FSL_PMIC_I2C_ADDR	0x8