linux-kernel - [PATCH v7 01/12] mfd: rk808: fix up the chip id get failed

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Message-Id: <1500635681-12477-2-git-send-email-chenjh@rock-chips.com>
Date:   Fri, 21 Jul 2017 19:14:30 +0800
From:   Joseph Chen <chenjh@...k-chips.com>
To:     gnurou@...il.com, linus.walleij@...aro.org,
        dmitry.torokhov@...il.com
Cc:     linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        huangtao@...k-chips.com, tony.xie@...k-chips.com,
        zhangqing@...k-chips.com, wdc@...k-chips.com,
        devicetree@...r.kernel.org, w.egorov@...tec.de,
        lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-gpio@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: [PATCH v7 01/12] mfd: rk808: fix up the chip id get failed

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

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

Signed-off-by: Elaine Zhang <zhangqing@...k-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