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 4a0e3c5643dd62ad7c414ddd4139fa776baad19a..44da500c0385a2f8c5b50138f93f3f775bafe9b1 100644 (file)
--- 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 f30e908221a280ed163a585cd0fa64a299d8eba6..1efc0db3de60c1fe3d20ba662832a3e1398f1bd5 100644 (file)
--- 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
  *