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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-10 10:01:21 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-10 10:01:21 -0800
commit7d884710bb3635f94dac152ae226ca54a585a223 (patch)
treeb38909954296f90a954264d1c3be4d597b67d5d4 /drivers/rtc/rtc-ds1390.c
parent3b13866869b8407497d20a916450594e117583e6 (diff)
parent1e3929ef0e1c4c7127b785ce7a236965b3739406 (diff)
downloadop-kernel-dev-7d884710bb3635f94dac152ae226ca54a585a223.zip
op-kernel-dev-7d884710bb3635f94dac152ae226ca54a585a223.tar.gz
Merge tag 'rtc-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni: "Core: - Fix rtctest error path New drivers: - Microcrystal RV8803 Subsystem wide cleanups: - remove misuse of IRQF_NO_SUSPEND flag Drivers: - at91rm9200: clear RTC alarm status flag prior to suspending - davinci: remove incorrect reference to probe function - ds1307: Fix alarm programming for mcp794xx - ds1390: trickle charger support, fix ds1390_get_reg - isl1208: Pass the IRQF_ONESHOT flag - opal: fix type of token - pcf2127: fix RTC_READ_VL, remove useless driver version - pcf85063: return an error when date is invalid - pcf8563: add CLKOUT to common clock framework - rx8025: remove unnecessary braces - s3c: Set year, month, day value for setting alarm - stmp3xxx: unify register access macros - License fixes: pcf2127, da9063 - wakeup-source support for isl12057 and opal" * tag 'rtc-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (23 commits) rtc: Add a driver for Micro Crystal RV8803 rtc: s3c: Set year, month, day value for setting alarm rtc: ds1307: Fix alarm programming for mcp794xx rtc: isl12057: enable support for the standard "wakeup-source" property rtc: opal: enable support for the stardard "wakeup-source" property rtc: isl1208: Pass the IRQF_ONESHOT flag rtc: pcf8563: add CLKOUT to common clock framework rtc: davinci: remove incorrect reference to probe function rtc: at91rm9200: clear RTC alarm status flag prior to suspending rtc: pcf2127: remove useless driver version rtc: pcf2127: fix reading uninitialized value on RTC_READ_VL ioctl rtc: stmp3xxx: unify register access macros rtc: da9063: GPL copyright inconsistency fix rtc: pcf85063: return an error when date is invalid rtc: rx8025: remove unnecessary braces rtc: ds1343: remove misuse of IRQF_NO_SUSPEND flag rtc: ab8500: remove misuse of IRQF_NO_SUSPEND flag rtc: pl031: remove misuse of IRQF_NO_SUSPEND flag rtc: opal: fix type of token rtc: ds1390: Add trickle charger device tree binding ...
Diffstat (limited to 'drivers/rtc/rtc-ds1390.c')
-rw-r--r--drivers/rtc/rtc-ds1390.c65
1 files changed, 64 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-ds1390.c b/drivers/rtc/rtc-ds1390.c
index 4c229c9..aa0d2c6 100644
--- a/drivers/rtc/rtc-ds1390.c
+++ b/drivers/rtc/rtc-ds1390.c
@@ -20,6 +20,7 @@
#include <linux/spi/spi.h>
#include <linux/bcd.h>
#include <linux/slab.h>
+#include <linux/of.h>
#define DS1390_REG_100THS 0x00
#define DS1390_REG_SECONDS 0x01
@@ -40,11 +41,31 @@
#define DS1390_REG_STATUS 0x0E
#define DS1390_REG_TRICKLE 0x0F
+#define DS1390_TRICKLE_CHARGER_ENABLE 0xA0
+#define DS1390_TRICKLE_CHARGER_250_OHM 0x01
+#define DS1390_TRICKLE_CHARGER_2K_OHM 0x02
+#define DS1390_TRICKLE_CHARGER_4K_OHM 0x03
+#define DS1390_TRICKLE_CHARGER_NO_DIODE 0x04
+#define DS1390_TRICKLE_CHARGER_DIODE 0x08
+
struct ds1390 {
struct rtc_device *rtc;
u8 txrx_buf[9]; /* cmd + 8 registers */
};
+static void ds1390_set_reg(struct device *dev, unsigned char address,
+ unsigned char data)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ unsigned char buf[2];
+
+ /* MSB must be '1' to write */
+ buf[0] = address | 0x80;
+ buf[1] = data;
+
+ spi_write(spi, buf, 2);
+}
+
static int ds1390_get_reg(struct device *dev, unsigned char address,
unsigned char *data)
{
@@ -62,11 +83,50 @@ static int ds1390_get_reg(struct device *dev, unsigned char address,
if (status != 0)
return status;
- *data = chip->txrx_buf[1];
+ *data = chip->txrx_buf[0];
return 0;
}
+static void ds1390_trickle_of_init(struct spi_device *spi)
+{
+ u32 ohms = 0;
+ u8 value;
+
+ if (of_property_read_u32(spi->dev.of_node, "trickle-resistor-ohms",
+ &ohms))
+ goto out;
+
+ /* Enable charger */
+ value = DS1390_TRICKLE_CHARGER_ENABLE;
+ if (of_property_read_bool(spi->dev.of_node, "trickle-diode-disable"))
+ value |= DS1390_TRICKLE_CHARGER_NO_DIODE;
+ else
+ value |= DS1390_TRICKLE_CHARGER_DIODE;
+
+ /* Resistor select */
+ switch (ohms) {
+ case 250:
+ value |= DS1390_TRICKLE_CHARGER_250_OHM;
+ break;
+ case 2000:
+ value |= DS1390_TRICKLE_CHARGER_2K_OHM;
+ break;
+ case 4000:
+ value |= DS1390_TRICKLE_CHARGER_4K_OHM;
+ break;
+ default:
+ dev_warn(&spi->dev,
+ "Unsupported ohm value %02ux in dt\n", ohms);
+ return;
+ }
+
+ ds1390_set_reg(&spi->dev, DS1390_REG_TRICKLE, value);
+
+out:
+ return;
+}
+
static int ds1390_read_time(struct device *dev, struct rtc_time *dt)
{
struct spi_device *spi = to_spi_device(dev);
@@ -143,6 +203,9 @@ static int ds1390_probe(struct spi_device *spi)
return res;
}
+ if (spi->dev.of_node)
+ ds1390_trickle_of_init(spi);
+
chip->rtc = devm_rtc_device_register(&spi->dev, "ds1390",
&ds1390_rtc_ops, THIS_MODULE);
if (IS_ERR(chip->rtc)) {
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