[PATCH v4 1/5] gpio: qcom_pmic: fix silent dev_read_addr downcast

[Caleb Connolly]

priv->pid is uint32_t, but dev_read_addr() returns a uint64_t on arm64,
with the upper bits being used for error codes. Do error checking before
downcasting to u32 to prevent errors being silently ignored.

Reviewed-by: Sumit Garg <sumit.garg at linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 drivers/gpio/qcom_pmic_gpio.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/qcom_pmic_gpio.c b/drivers/gpio/qcom_pmic_gpio.c
index 65feb453ebc3..e5841f502953 100644
--- a/drivers/gpio/qcom_pmic_gpio.c
+++ b/drivers/gpio/qcom_pmic_gpio.c
@@ -221,11 +221,14 @@ static int qcom_gpio_probe(struct udevice *dev)
 {
 	struct qcom_gpio_bank *priv = dev_get_priv(dev);
 	int reg;
+	u64 pid;
 
-	priv->pid = dev_read_addr(dev);
-	if (priv->pid == FDT_ADDR_T_NONE)
+	pid = dev_read_addr(dev);
+	if (pid == FDT_ADDR_T_NONE)
 		return log_msg_ret("bad address", -EINVAL);
 
+	priv->pid = pid;
+
 	/* Do a sanity check */
 	reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE);
 	if (reg != REG_TYPE_VAL)
@@ -328,11 +331,14 @@ static int qcom_pwrkey_probe(struct udevice *dev)
 {
 	struct qcom_gpio_bank *priv = dev_get_priv(dev);
 	int reg;
+	u64 pid;
 
-	priv->pid = dev_read_addr(dev);
-	if (priv->pid == FDT_ADDR_T_NONE)
+	pid = dev_read_addr(dev);
+	if (pid == FDT_ADDR_T_NONE)
 		return log_msg_ret("bad address", -EINVAL);
 
+	priv->pid = pid;
+
 	/* Do a sanity check */
 	reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE);
 	if (reg != 0x1)

-- 
2.42.1