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Subject[PATCH] mfd: RK808: Fetch PMIC variant from chip id register
Date
Add and use the chip id registers to determine the PMIC variant.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
---

This patch is based on top of

[v6,1/5] mfd: RK808: Add RK818 support
(https://patchwork.kernel.org/patch/9172223/)

---
drivers/mfd/rk808.c | 17 +++++++++--------
include/linux/mfd/rk808.h | 6 ++++--
2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
index 66f7b08..fbec1d8 100644
--- a/drivers/mfd/rk808.c
+++ b/drivers/mfd/rk808.c
@@ -291,8 +291,8 @@ static void rk808_device_shutdown(void)
}

static const struct of_device_id rk808_of_match[] = {
- { .compatible = "rockchip,rk808", .data = (void *) RK808_ID },
- { .compatible = "rockchip,rk818", .data = (void *) RK818_ID },
+ { .compatible = "rockchip,rk808" },
+ { .compatible = "rockchip,rk818" },
{ },
};
MODULE_DEVICE_TABLE(of, rk808_of_match);
@@ -302,7 +302,6 @@ static int rk808_probe(struct i2c_client *client,
{
struct device_node *np = client->dev.of_node;
struct rk808 *rk808;
- const struct of_device_id *match;
const struct rk808_reg_data *pre_init_reg;
const struct mfd_cell *cells;
int nr_pre_init_regs;
@@ -315,12 +314,14 @@ static int rk808_probe(struct i2c_client *client,
if (!rk808)
return -ENOMEM;

- match = of_match_device(rk808_of_match, &client->dev);
- if (!match) {
- dev_err(&client->dev, "Unable to match OF ID\n");
- return -ENODEV;
+ 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",
+ RK808_ID_MSB);
+ return rk808->variant;
}
- rk808->variant = (long)match->data;
+
+ dev_dbg(&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 e5ae21d..fc5db6f 100644
--- a/include/linux/mfd/rk808.h
+++ b/include/linux/mfd/rk808.h
@@ -69,6 +69,8 @@ enum rk808_reg {
#define RK808_RTC_INT_REG 0x12
#define RK808_RTC_COMP_LSB_REG 0x13
#define RK808_RTC_COMP_MSB_REG 0x14
+#define RK808_ID_MSB 0x17
+#define RK808_ID_LSB 0x18
#define RK808_CLK32OUT_REG 0x20
#define RK808_VB_MON_REG 0x21
#define RK808_THERMAL_REG 0x22
@@ -318,8 +320,8 @@ enum {
};

enum {
- RK808_ID,
- RK818_ID,
+ RK808_ID = 0x0000,
+ RK818_ID = 0x8181,
};

struct rk808 {
--
1.9.1
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