[PATCH 3/3] rtc: max77686: Use single-byte writes on MAX77620
From: Thierry Reding
Date: Fri Apr 17 2020 - 13:08:38 EST
From: Thierry Reding <treding@xxxxxxxxxx>
The MAX77620 doesn't support bulk writes, so make sure the regmap code
breaks bulk writes into multiple single-byte writes.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/rtc/rtc-max77686.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
index 35fd74b83626..f53db4d6bead 100644
--- a/drivers/rtc/rtc-max77686.c
+++ b/drivers/rtc/rtc-max77686.c
@@ -78,6 +78,8 @@ struct max77686_rtc_driver_data {
int alarm_pending_status_reg;
/* RTC IRQ CHIP for regmap */
const struct regmap_irq_chip *rtc_irq_chip;
+ /* regmap configuration for the chip */
+ const struct regmap_config *regmap_config;
};
struct max77686_rtc_info {
@@ -182,6 +184,11 @@ static const struct regmap_irq_chip max77686_rtc_irq_chip = {
.num_irqs = ARRAY_SIZE(max77686_rtc_irqs),
};
+static const struct regmap_config max77686_rtc_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
static const struct max77686_rtc_driver_data max77686_drv_data = {
.delay = 16000,
.mask = 0x7f,
@@ -191,6 +198,13 @@ static const struct max77686_rtc_driver_data max77686_drv_data = {
.alarm_pending_status_reg = MAX77686_REG_STATUS2,
.rtc_i2c_addr = MAX77686_I2C_ADDR_RTC,
.rtc_irq_chip = &max77686_rtc_irq_chip,
+ .regmap_config = &max77686_rtc_regmap_config,
+};
+
+static const struct regmap_config max77620_rtc_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .use_single_write = true,
};
static const struct max77686_rtc_driver_data max77620_drv_data = {
@@ -202,6 +216,7 @@ static const struct max77686_rtc_driver_data max77620_drv_data = {
.alarm_pending_status_reg = MAX77686_INVALID_REG,
.rtc_i2c_addr = MAX77620_I2C_ADDR_RTC,
.rtc_irq_chip = &max77686_rtc_irq_chip,
+ .regmap_config = &max77620_rtc_regmap_config,
};
static const unsigned int max77802_map[REG_RTC_END] = {
@@ -658,11 +673,6 @@ static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
return ret;
}
-static const struct regmap_config max77686_rtc_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
-};
-
static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
{
struct device *parent = info->dev->parent;
@@ -698,7 +708,7 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
}
info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
- &max77686_rtc_regmap_config);
+ info->drv_data->regmap_config);
if (IS_ERR(info->rtc_regmap)) {
ret = PTR_ERR(info->rtc_regmap);
dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
--
2.24.1