diff options
| -rw-r--r-- | README | 11 | ||||
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 16 | ||||
| -rw-r--r-- | include/i2c.h | 3 |
3 files changed, 27 insertions, 3 deletions
@@ -1509,6 +1509,17 @@ The following options need to be configured: custom i2c_init_board() routine in boards/xxx/board.c is run early in the boot sequence. + CONFIG_SYS_I2C_BOARD_LATE_INIT + + An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is + defined a custom i2c_board_late_init() routine in + boards/xxx/board.c is run AFTER the operations in i2c_init() + is completed. This callpoint can be used to unreset i2c bus + using CPU i2c controller register accesses for CPUs whose i2c + controller provide such a method. It is called at the end of + i2c_init() to allow i2c_init operations to setup the i2c bus + controller on the CPU (e.g. setting bus speed & slave address). + CONFIG_I2CFAST (PPC405GP|PPC405EP only) This option enables configuration of bi_iic_fast[] flags diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 2241990f94f..cb13deeea96 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -221,9 +221,10 @@ i2c_init(int speed, int slaveadd) unsigned int temp; #ifdef CONFIG_SYS_I2C_INIT_BOARD - /* call board specific i2c bus reset routine before accessing the */ - /* environment, which might be in a chip on that bus. For details */ - /* about this problem see doc/I2C_Edge_Conditions. */ + /* Call board specific i2c bus reset routine before accessing the + * environment, which might be in a chip on that bus. For details + * about this problem see doc/I2C_Edge_Conditions. + */ i2c_init_board(); #endif dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET); @@ -249,6 +250,15 @@ i2c_init(int speed, int slaveadd) writeb(0x0, &dev->sr); /* clear status register */ writeb(I2C_CR_MEN, &dev->cr); /* start I2C controller */ #endif + +#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT + /* Call board specific i2c bus reset routine AFTER the bus has been + * initialized. Use either this callpoint or i2c_init_board; + * which is called before i2c_init operations. + * For details about this problem see doc/I2C_Edge_Conditions. + */ + i2c_board_late_init(); +#endif } static int diff --git a/include/i2c.h b/include/i2c.h index d828964256e..cd23c8ac124 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -111,6 +111,9 @@ void i2c_init(int speed, int slaveaddr); #ifdef CONFIG_SYS_I2C_INIT_BOARD void i2c_init_board(void); #endif +#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT +void i2c_board_late_init(void); +#endif #if defined(CONFIG_I2C_MUX) |