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 <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
diff --git a/drivers/rtc/rtc-uclass.c b/drivers/rtc/rtc-uclass.c
index 4a0e3c5..44da500 100644
--- a/drivers/rtc/rtc-uclass.c
+++ b/drivers/rtc/rtc-uclass.c
@@ -59,6 +59,25 @@
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 f30e908..1efc0db 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -68,6 +68,18 @@
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
*
* @dev: Device to read from
@@ -133,6 +145,18 @@
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
*
* @dev: Device to read from