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Subject[PATCH 10/12] rtc: pcf85063: add nvram support
Date
The pcf85063 has one byte of nvram.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-pcf85063.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index 0ac763c10744..04aaa83a5431 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -38,6 +38,8 @@
#define PCF85063_CTRL2_AF BIT(6)
#define PCF85063_CTRL2_AIE BIT(7)

+#define PCF85063_REG_RAM 0x03
+
#define PCF85063_REG_SC 0x04 /* datetime */
#define PCF85063_REG_SC_OS 0x80

@@ -236,6 +238,18 @@ static const struct rtc_class_ops pcf85063_rtc_ops_alarm = {
.alarm_irq_enable = pcf85063_rtc_alarm_irq_enable,
};

+static int pcf85063_nvmem_read(void *priv, unsigned int offset,
+ void *val, size_t bytes)
+{
+ return regmap_read(priv, PCF85063_REG_RAM, val);
+}
+
+static int pcf85063_nvmem_write(void *priv, unsigned int offset,
+ void *val, size_t bytes)
+{
+ return regmap_write(priv, PCF85063_REG_RAM, *(u8 *)val);
+}
+
static int pcf85063_load_capacitance(struct pcf85063 *pcf85063,
const struct device_node *np,
unsigned int force_cap)
@@ -298,6 +312,13 @@ static int pcf85063_probe(struct i2c_client *client)
int err;
const struct pcf85063_config *config = &pcf85063tp_config;
const void *data = of_device_get_match_data(&client->dev);
+ struct nvmem_config nvmem_cfg = {
+ .name = "pcf85063_nvram",
+ .reg_read = pcf85063_nvmem_read,
+ .reg_write = pcf85063_nvmem_write,
+ .type = NVMEM_TYPE_BATTERY_BACKED,
+ .size = 1,
+ };

dev_dbg(&client->dev, "%s\n", __func__);

@@ -354,6 +375,9 @@ static int pcf85063_probe(struct i2c_client *client)
}
}

+ nvmem_cfg.priv = pcf85063->regmap;
+ rtc_nvmem_register(pcf85063->rtc, &nvmem_cfg);
+
return rtc_register_device(pcf85063->rtc);
}

--
2.20.1
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