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| author | Bin Meng <bmeng.cn@gmail.com> | 2017-03-16 07:26:27 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2017-04-10 10:02:03 +0800 |
| commit | d24c7fbcc5e530bb5a2b5326869aaa2d7a61d607 (patch) | |
| tree | 554bd94a3cad5bd697a9adfc6fc54cca60fbd3d1 | |
| parent | c04cf0a5717372f8546d07cdb6a13abcdcc5be85 (diff) | |
| download | u-boot-d24c7fbcc5e530bb5a2b5326869aaa2d7a61d607.zip u-boot-d24c7fbcc5e530bb5a2b5326869aaa2d7a61d607.tar.gz u-boot-d24c7fbcc5e530bb5a2b5326869aaa2d7a61d607.tar.bz2 | |
dm: rtc: Add 16-bit read/write support
At present there are only 8-bit and 32-bit read/write routines in
the rtc uclass driver. This adds the 16-bit support.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | drivers/rtc/rtc-uclass.c | 30 | ||||
| -rw-r--r-- | include/rtc.h | 20 |
2 files changed, 50 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-uclass.c b/drivers/rtc/rtc-uclass.c index 300e9b3..89312c5 100644 --- a/drivers/rtc/rtc-uclass.c +++ b/drivers/rtc/rtc-uclass.c @@ -60,6 +60,36 @@ int rtc_write8(struct udevice *dev, unsigned int reg, int val) return ops->write8(dev, reg, val); } +int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep) +{ + u16 value = 0; + int ret; + int i; + + for (i = 0; i < sizeof(value); i++) { + ret = rtc_read8(dev, reg + i); + if (ret < 0) + return ret; + value |= ret << (i << 3); + } + + *valuep = value; + return 0; +} + +int rtc_write16(struct udevice *dev, unsigned int reg, u16 value) +{ + int i, ret; + + for (i = 0; i < sizeof(value); i++) { + ret = rtc_write8(dev, reg + i, (value >> (i << 3)) & 0xff); + if (ret) + return ret; + } + + return 0; +} + int rtc_read32(struct udevice *dev, unsigned int reg, u32 *valuep) { u32 value = 0; diff --git a/include/rtc.h b/include/rtc.h index 69fe8d4..49142b6 100644 --- a/include/rtc.h +++ b/include/rtc.h @@ -128,6 +128,26 @@ int rtc_read8(struct udevice *dev, unsigned int reg); int rtc_write8(struct udevice *dev, unsigned int reg, int val); /** + * rtc_read16() - Read a 16-bit value from the RTC + * + * @dev: Device to read from + * @reg: Offset to start reading from + * @valuep: Place to put the value that is read + * @return 0 if OK, -ve on error + */ +int rtc_read16(struct udevice *dev, unsigned int reg, u16 *valuep); + +/** + * rtc_write16() - Write a 16-bit value to the RTC + * + * @dev: Device to write to + * @reg: Register to start writing to + * @value: Value to write + * @return 0 if OK, -ve on error + */ +int rtc_write16(struct udevice *dev, unsigned int reg, u16 value); + +/** * rtc_read32() - Read a 32-bit value from the RTC * * @dev: Device to read from |