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authorBiju Das <biju.das@bp.renesas.com>2018-12-07 11:27:44 +0000
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2018-12-11 00:48:17 +0100
commitfc979933bcf162595b6004d0de4effb64c323152 (patch)
tree11e5fc4e2378b615bce410608c5a7b5e07103ce8 /drivers/rtc/rtc-pcf85363.c
parentbae5e94bea188e652d798eeb4b92b88a355591f6 (diff)
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rtc: pcf85363: Add support for NXP pcf85263 rtc
Add support for NXP pcf85263 real-time clock. pcf85263 rtc is compatible with pcf85363,except that pcf85363 has additional 64 bytes of RAM. 1 byte of nvmem is supported and exposed in sysfs (# is the instance number,starting with 0): /sys/bus/nvmem/devices/pcf85x63-#/nvmem Signed-off-by: Biju Das <biju.das@bp.renesas.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-pcf85363.c')
-rw-r--r--drivers/rtc/rtc-pcf85363.c94
1 files changed, 76 insertions, 18 deletions
diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c
index c04a1edcd571..a3988079f60a 100644
--- a/drivers/rtc/rtc-pcf85363.c
+++ b/drivers/rtc/rtc-pcf85363.c
@@ -120,6 +120,11 @@ struct pcf85363 {
struct regmap *regmap;
};
+struct pcf85x63_config {
+ struct regmap_config regmap;
+ unsigned int num_nvram;
+};
+
static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
@@ -311,25 +316,75 @@ static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val,
val, bytes);
}
-static const struct regmap_config regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = 0x7f,
+static int pcf85x63_nvram_read(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct pcf85363 *pcf85363 = priv;
+ unsigned int tmp_val;
+ int ret;
+
+ ret = regmap_read(pcf85363->regmap, CTRL_RAMBYTE, &tmp_val);
+ (*(unsigned char *) val) = (unsigned char) tmp_val;
+
+ return ret;
+}
+
+static int pcf85x63_nvram_write(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct pcf85363 *pcf85363 = priv;
+ unsigned char tmp_val;
+
+ tmp_val = *((unsigned char *)val);
+ return regmap_write(pcf85363->regmap, CTRL_RAMBYTE,
+ (unsigned int)tmp_val);
+}
+
+static const struct pcf85x63_config pcf_85263_config = {
+ .regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x2f,
+ },
+ .num_nvram = 1
+};
+
+static const struct pcf85x63_config pcf_85363_config = {
+ .regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x7f,
+ },
+ .num_nvram = 2
};
static int pcf85363_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pcf85363 *pcf85363;
- struct nvmem_config nvmem_cfg = {
- .name = "pcf85363-",
- .word_size = 1,
- .stride = 1,
- .size = NVRAM_SIZE,
- .reg_read = pcf85363_nvram_read,
- .reg_write = pcf85363_nvram_write,
+ const struct pcf85x63_config *config = &pcf_85363_config;
+ const void *data = of_device_get_match_data(&client->dev);
+ static struct nvmem_config nvmem_cfg[] = {
+ {
+ .name = "pcf85x63-",
+ .word_size = 1,
+ .stride = 1,
+ .size = 1,
+ .reg_read = pcf85x63_nvram_read,
+ .reg_write = pcf85x63_nvram_write,
+ }, {
+ .name = "pcf85363-",
+ .word_size = 1,
+ .stride = 1,
+ .size = NVRAM_SIZE,
+ .reg_read = pcf85363_nvram_read,
+ .reg_write = pcf85363_nvram_write,
+ },
};
- int ret;
+ int ret, i;
+
+ if (data)
+ config = data;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
@@ -339,7 +394,7 @@ static int pcf85363_probe(struct i2c_client *client,
if (!pcf85363)
return -ENOMEM;
- pcf85363->regmap = devm_regmap_init_i2c(client, &regmap_config);
+ pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap);
if (IS_ERR(pcf85363->regmap)) {
dev_err(&client->dev, "regmap allocation failed\n");
return PTR_ERR(pcf85363->regmap);
@@ -370,15 +425,18 @@ static int pcf85363_probe(struct i2c_client *client,
ret = rtc_register_device(pcf85363->rtc);
- nvmem_cfg.priv = pcf85363;
- rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg);
+ for (i = 0; i < config->num_nvram; i++) {
+ nvmem_cfg[i].priv = pcf85363;
+ rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg[i]);
+ }
return ret;
}
static const struct of_device_id dev_ids[] = {
- { .compatible = "nxp,pcf85363" },
- {}
+ { .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
+ { .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
+ { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, dev_ids);
@@ -393,5 +451,5 @@ static struct i2c_driver pcf85363_driver = {
module_i2c_driver(pcf85363_driver);
MODULE_AUTHOR("Eric Nelson");
-MODULE_DESCRIPTION("pcf85363 I2C RTC driver");
+MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver");
MODULE_LICENSE("GPL");