[PATCH v6 01/12] mfd: rk808: fix up the chip id get failed

Jianhong Chen
2017-06-08T07:14:19Z

From: Elaine Zhang <zhangqing@rock-chips.com>

the rk8xx chip id is:
((MSB << 8) | LSB) & 0xfff0

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
---
drivers/mfd/rk808.c | 21 +++++++++++++++------
include/linux/mfd/rk808.h | 1 +
2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
index fd087cb..3334a2a 100644
--- a/drivers/mfd/rk808.c
+++ b/drivers/mfd/rk808.c
@@ -325,7 +325,7 @@ static int rk808_probe(struct i2c_client *client,
void (*pm_pwroff_fn)(void);
int nr_pre_init_regs;
int nr_cells;
- int pm_off = 0;
+ int pm_off = 0, msb, lsb;
int ret;
int i;

@@ -333,14 +333,23 @@ static int rk808_probe(struct i2c_client *client,
if (!rk808)
return -ENOMEM;

- rk808->variant = i2c_smbus_read_word_data(client, RK808_ID_MSB);
- if (rk808->variant < 0) {
- dev_err(&client->dev, "Failed to read the chip id at 0x%02x\n",
+ /* read Chip variant */
+ msb = i2c_smbus_read_byte_data(client, RK808_ID_MSB);
+ if (msb < 0) {
+ dev_err(&client->dev, "failed to read the chip id at 0x%x\n",
RK808_ID_MSB);
- return rk808->variant;
+ return msb;
}

- dev_dbg(&client->dev, "Chip id: 0x%x\n", (unsigned int)rk808->variant);
+ lsb = i2c_smbus_read_byte_data(client, RK808_ID_LSB);
+ if (lsb < 0) {
+ dev_err(&client->dev, "failed to read the chip id at 0x%x\n",
+ RK808_ID_LSB);
+ return lsb;
+ }
+
+ rk808->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
+ dev_info(&client->dev, "Chip id: 0x%x\n", (unsigned int)rk808->variant);

switch (rk808->variant) {
case RK808_ID:
diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h
index 83701ef..54feb14 100644
--- a/include/linux/mfd/rk808.h
+++ b/include/linux/mfd/rk808.h
@@ -298,6 +298,7 @@ enum rk818_reg {
#define VOUT_LO_INT BIT(0)
#define CLK32KOUT2_EN BIT(0)

+#define RK8XX_ID_MSK 0xfff0
enum {
BUCK_ILMIN_50MA,
BUCK_ILMIN_100MA,
--
1.9.1