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-rw-r--r--drivers/i2c/busses/i2c-mpc.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 6ad87555f71e..648a5afded64 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -350,7 +350,11 @@ static u32 mpc_i2c_get_sec_cfg_8xxx(void)
static u32 mpc_i2c_get_prescaler_8xxx(void)
{
- /* mpc83xx and mpc82xx all have prescaler 1 */
+ /*
+ * According to the AN2919 all MPC824x have prescaler 1, while MPC83xx
+ * may have prescaler 1, 2, or 3, depending on the power-on
+ * configuration.
+ */
u32 prescaler = 1;
/* mpc85xx */
@@ -367,6 +371,10 @@ static u32 mpc_i2c_get_prescaler_8xxx(void)
|| (SVR_SOC_VER(svr) == SVR_8610))
/* the above 85xx SoCs have prescaler 1 */
prescaler = 1;
+ else if ((SVR_SOC_VER(svr) == SVR_8533)
+ || (SVR_SOC_VER(svr) == SVR_8544))
+ /* the above 85xx SoCs have prescaler 3 or 2 */
+ prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
else
/* all the other 85xx have prescaler 2 */
prescaler = 2;
@@ -383,8 +391,6 @@ static int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
int i;
/* Determine proper divider value */
- if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
- prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
if (!prescaler)
prescaler = mpc_i2c_get_prescaler_8xxx();

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