From def609d512da8820c76ff3f737a5854e59de4c22 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Mon, 6 Jul 2020 22:01:11 +0200 Subject: [PATCH] rtc: add dm_rtc_write() helper Similar to dm_rtc_read(), introduce a helper that allows the caller to write multiple consecutive 8-bit registers with one call. If the driver provides the ->write method, use that, otherwise loop using ->write8. Reviewed-by: Simon Glass Reviewed-by: Heiko Schocher Signed-off-by: Rasmus Villemoes --- drivers/rtc/rtc-uclass.c | 19 +++++++++++++++++++ include/rtc.h | 24 ++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/drivers/rtc/rtc-uclass.c b/drivers/rtc/rtc-uclass.c index 4a0e3c5643..44da500c03 100644 --- a/drivers/rtc/rtc-uclass.c +++ b/drivers/rtc/rtc-uclass.c @@ -59,6 +59,25 @@ int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len return 0; } +int dm_rtc_write(struct udevice *dev, unsigned int reg, + const u8 *buf, unsigned int len) +{ + struct rtc_ops *ops = rtc_get_ops(dev); + + assert(ops); + if (ops->write) + return ops->write(dev, reg, buf, len); + if (!ops->write8) + return -ENOSYS; + while (len--) { + int ret = ops->write8(dev, reg++, *buf++); + + if (ret < 0) + return ret; + } + return 0; +} + int rtc_read8(struct udevice *dev, unsigned int reg) { struct rtc_ops *ops = rtc_get_ops(dev); diff --git a/include/rtc.h b/include/rtc.h index f30e908221..1efc0db3de 100644 --- a/include/rtc.h +++ b/include/rtc.h @@ -67,6 +67,18 @@ struct rtc_ops { int (*read)(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len); + /** + * write() - Write multiple 8-bit registers + * + * @dev: Device to write to + * @reg: First register to write + * @buf: Input buffer + * @len: Number of registers to write + * @return 0 if OK, -ve on error + */ + int (*write)(struct udevice *dev, unsigned int reg, + const u8 *buf, unsigned int len); + /** * read8() - Read an 8-bit register * @@ -132,6 +144,18 @@ int dm_rtc_reset(struct udevice *dev); */ int dm_rtc_read(struct udevice *dev, unsigned int reg, u8 *buf, unsigned int len); +/** + * dm_rtc_write() - Write multiple 8-bit registers + * + * @dev: Device to write to + * @reg: First register to write + * @buf: Input buffer + * @len: Number of registers to write + * @return 0 if OK, -ve on error + */ +int dm_rtc_write(struct udevice *dev, unsigned int reg, + const u8 *buf, unsigned int len); + /** * rtc_read8() - Read an 8-bit register * -- 2.39.5