[rtc-linux] [PATCH] rtc: add support for rtc NXP pca21125 and pca8565
This is a patch to support the SPI compatible PCA21125 device
with the I2C based rtc-pcf8563 driver using regmap layer.
Further this patch adds "pca8565" to the set of i2c ids.
Signed-off-by: Venkat Prashanth B U
---
change log v3:
1. Add a regmap layer to I2C PCF8563 to support SPI PCA21125.
2. Add pca8565 to the set of i2c ids of rtc-pcf8563.
---
---
drivers/rtc/rtc-pcf8563.c | 82 +++
1 file changed, 82 insertions(+)
diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 1227cea..26c8b9b 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -22,6 +22,8 @@
#include
#include
#include
+#include
+#include
#define PCF8563_REG_ST10x00 /* status */
#define PCF8563_REG_ST20x01
@@ -59,6 +61,7 @@
#define PCF8563_SC_LV 0x80 /* low voltage */
#define PCF8563_MO_C 0x80 /* century */
+#define PCF8563_REG_SR 0x01 /*control-status register*/
static struct i2c_driver pcf8563_driver;
@@ -84,6 +87,9 @@ struct pcf8563 {
struct i2c_client *client;
#ifdef CONFIG_COMMON_CLK
struct clk_hw clkout_hw;
+const struct device *dev;
+const struct regmap *regmap;
+ bool suspended;
#endif
};
@@ -629,6 +635,7 @@ static int pcf8563_probe(struct i2c_client *client,
static const struct i2c_device_id pcf8563_id[] = {
{ "pcf8563", 0 },
{ "rtc8564", 0 },
+ { "pca8565", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pcf8563_id);
@@ -636,11 +643,86 @@ MODULE_DEVICE_TABLE(i2c, pcf8563_id);
#ifdef CONFIG_OF
static const struct of_device_id pcf8563_of_match[] = {
{ .compatible = "nxp,pcf8563" },
+ { .compatible = "nxp,pca8565" },
{}
};
MODULE_DEVICE_TABLE(of, pcf8563_of_match);
#endif
+#if IS_ENABLED(CONFIG_SPI_MASTER)
+
+static int pca21125_probe(const struct spi_device *spi)
+{
+ int res;
+ unsigned int tmp;
+ static const struct regmap_config config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .write_flag_mask = 0x80,
+ };
+const struct regmap *regmap;
+const struct pcf8563 *pcf8563;
+
+ regmap = devm_regmap_init_spi(spi, &config);
+
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "%s: regmap allocation
failed: %ld\n",
+ __func__, PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ spi->mode = SPI_MODE_3;
+ spi->bits_per_word = 8;
+ spi_setup(spi);
+
+ res = regmap_read(regmap, PCF8563_REG_SC, &tmp);
+
+ if (res)
+ return res;
+ res = regmap_read(regmap, PCF8563_REG_CLKO, &tmp);
+
+ if (res)
+ return res;
+
+ res = regmap_write(regmap, PCF8563_REG_CLKO, tmp & 0x1c);
+
+ if (res)
+ return res;
+
+ res = regmap_read(regmap, PCF8563_REG_SR, &tmp);
+
+ if (res)
+ return res;
+
+ res = regmap_write(regmap, PCF8563_REG_SR, tmp & 0x88);
+
+ if (res)
+ return res;
+
+ /* Print our settings */
+ res = regmap_read(regmap, PCF8563_REG_CLKO, &tmp);
+
+ if (res)
+ return res;
+
+ dev_info(&spi->dev, "Control Reg: 0x%02x\n", tmp);
+ res = regmap_read(regmap, PCF8563_REG_SR, &tmp);
+
+ if (res)
+ return res;
+
+ dev_info(&spi->dev, "Ctrl/Stat Reg: 0x%02x\n", tmp);
+
+ pcf8563->rtc = devm_rtc_device_register(&spi->dev,
+ "pcf8563",
+ &pcf8563_rtc_ops, THIS_MODULE);
+}
+
+const struct spi_driver pca21125_driver = {
+ .driver = {
+ .name= "pca21125",
+ },
+
static struct i2c_driver pcf8563_driver = {
.driver = {
.name = "rtc-pcf8563",
--
1.9.2
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[rtc-linux] [PATCH] rtc: add support for rtc NXP pca21125
This is the patch to add support for
NXP rtc pca21125
Signed-off-by: Venkat Prashanth B U
---
---
drivers/rtc/Kconfig| 12
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-pca21125.c | 164 +
3 files changed, 177 insertions(+)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e215f50..df10e0e 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -686,6 +686,18 @@ config RTC_DRV_MAX6916
This driver can also be built as a module. If so, the module
will be called rtc-max6916.
+config RTC_DRV_PCA21125
+ tristate "NXP PCA21125"
+ help
+ If you say yes here you will get support for the
+ NXP PCA21125 SPI RTC chip.
+
+ This driver only supports the RTC feature, and not other chip
+ features such as alarms.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-pca21125.
+
config RTC_DRV_R9701
tristate "Epson RTC-9701JE"
help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 7cf7ad5..2c6af37 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -105,6 +105,7 @@ obj-$(CONFIG_RTC_DRV_NUC900)+= rtc-nuc900.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o
obj-$(CONFIG_RTC_DRV_PALMAS) += rtc-palmas.o
+obj-$(CONFIG_RTC_DRV_PCA21125) += rtc-pca21125.o
obj-$(CONFIG_RTC_DRV_PCAP) += rtc-pcap.o
obj-$(CONFIG_RTC_DRV_PCF2123) += rtc-pcf2123.o
obj-$(CONFIG_RTC_DRV_PCF2127) += rtc-pcf2127.o
diff --git a/drivers/rtc/rtc-pca21125.c b/drivers/rtc/rtc-pca21125.c
index e69de29..8d42e4e 100644
--- a/drivers/rtc/rtc-pca21125.c
+++ b/drivers/rtc/rtc-pca21125.c
@@ -0,0 +1,164 @@
+ /* rtc-pca21125.c
+ *
+ * Driver for NXP PCA21125 CMOS, SPI Compatible
+ * Real Time Clock
+ *
+ * Author : Venkat Prashanth B U
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+ #include
+ #include
+ #include
+ #include
+ #include
+ #include
+ #include
+
+ /* Registers in pca21125 rtc */
+
+ #define PCA21125_SECONDS_REG0x02
+ #define PCA21125_MINUTES_REG0x03
+ #define PCA21125_HOURS_REG 0x04
+ #define PCA21125_DATE_REG 0x05
+ #define PCA21125_DAY_REG0x06
+ #define PCA21125_MONTH_REG 0x07
+ #define PCA21125_YEAR_REG 0x08
+ #define PCA21125_CONTROL_REG0x01
+ #define PCA21125_STATUS_REG 0x00
+ #define PCA21125_CLOCK_BURST0x0D
+
+ static int pca21125_read_reg(struct device *dev, unsigned char address,
+ unsigned char *data)
+ {
+ struct spi_device *spi = to_spi_device(dev);
+
+ *data = address | 0x80;
+
+ return spi_write_then_read(spi, data, 1, data, 1);
+ }
+
+ static int pca21125_write_reg(struct device *dev, unsigned char address,
+ unsigned char data)
+ {
+ struct spi_device *spi = to_spi_device(dev);
+ unsigned char buf[2];
+
+ buf[0] = address & 0x7F;
+ buf[1] = data;
+
+ return spi_write_then_read(spi, buf, 2, NULL, 0);
+ }
+
+ static int pca21125_read_time(struct device *dev, struct rtc_time *dt)
+ {
+ struct spi_device *spi = to_spi_device(dev);
+ int err;
+ unsigned char buf[8];
+
+ buf[0] = PCA21125_CLOCK_BURST | 0x80;
+
+ err = spi_write_then_read(spi, buf, 1, buf, 8);
+
+ if (err)
+ return err;
+
+ dt->tm_sec = bcd2bin(buf[0]);
+ dt->tm_min = bcd2bin(buf[1]);
+ dt->tm_hour = bcd2bin(buf[2] & 0x3F);
+ dt->tm_mday = bcd2bin(buf[3]);
+ dt->tm_mon = bcd2bin(buf[4]) - 1;
+ dt->tm_wday = bcd2bin(buf[5]) - 1;
+ dt->tm_year = bcd2bin(buf[6]) + 100;
+
+ return rtc_valid_tm(dt);
+ }
+
+ static int pca21125_set_time(struct device *dev, struct rtc_time *dt)
+ {
+ struct spi_device *spi = to_spi_device(dev);
+ unsigned char buf[9];
+
+ if (dt->tm_year < 100 || dt->tm_year > 199) {
+ dev_err(&spi->dev, "Year must be between 2000 and 2099.
It's %d.\n",
+ dt->tm_year + 1900);
+ return -EINVAL;
+ }
+
+ buf[0] = bin2bcd(dt-
