help
The size of the RX buffer (needs to be power of 2)
+config SERIAL_PUTS
+ bool "Enable printing strings all at once"
+ depends on DM_SERIAL
+ help
+ Some serial drivers are much more efficient when printing multiple
+ characters at once rather than printing characters individually. This
+ can be because they can load a fifo, or because individual print
+ calls have a constant overhead. With this option set, the serial
+ subsystem will try to provide serial drivers with as many characters
+ at once as possible, instead of printing characters one by one. Most
+ serial drivers do not need this config to print efficiently. If
+ unsure, say N.
+
config SERIAL_SEARCH_ALL
bool "Search for serial devices after default one failed"
depends on DM_SERIAL
static void _serial_puts(struct udevice *dev, const char *str)
{
- while (*str)
- _serial_putc(dev, *str++);
+ struct dm_serial_ops *ops = serial_get_ops(dev);
+
+ if (!CONFIG_IS_ENABLED(SERIAL_PUTS) || !ops->puts) {
+ while (*str)
+ _serial_putc(dev, *str++);
+ return;
+ }
+
+ do {
+ const char *newline = strchrnul(str, '\n');
+ size_t len = newline - str + !!*newline;
+
+ do {
+ ssize_t written = ops->puts(dev, str, len);
+
+ if (written < 0)
+ return;
+ str += written;
+ len -= written;
+ } while (len);
+
+ if (*newline)
+ _serial_putc(dev, '\r');
+ } while (*str);
}
static int __serial_getc(struct udevice *dev)
*/
int (*putc)(struct udevice *dev, const char ch);
/**
+ * puts() - Write a string
+ *
+ * This writes a string. This function should be implemented only if
+ * writing multiple characters at once is more performant than just
+ * calling putc() in a loop.
+ *
+ * If the whole string cannot be written at once, then this function
+ * should return the number of characters written. Returning a negative
+ * error code implies that no characters were written. If this function
+ * returns 0, then it will be called again with the same arguments.
+ *
+ * @dev: Device pointer
+ * @s: The string to write
+ * @len: The length of the string to write.
+ * @return The number of characters written on success, or -ve on error
+ */
+ ssize_t (*puts)(struct udevice *dev, const char *s, size_t len);
+ /**
* pending() - Check if input/output characters are waiting
*
* This can be used to return an indication of the number of waiting