rtc: pcf85063: add nvram support

The pcf85063 has one byte of nvram.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index ba4e75fbf258cefa7b5a991ed28100306778471f..0a03a60bc31fbc5b26cb83c1bdbb70ee4e522fb9 100644 (file)
--- 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);
 }