Some boards need to set things up before the debug UART can be used. On these boards a call to debug_uart_init() is insufficient. When this option is enabled, the function board_debug_uart_init() will be called when debug_uart_init() is called. You can put any code here that is needed to set up the UART ready for use, such as set pin multiplexing or enable clocks.
Signed-off-by: Simon Glass sjg@chromium.org ---
drivers/serial/Kconfig | 11 +++++++++++ include/debug_uart.h | 14 ++++++++++++++ 2 files changed, 25 insertions(+)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index ccb80d2..4418a57 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -109,6 +109,17 @@ config DEBUG_UART_SHIFT value. Use this value to specify the shift to use, where 0=byte registers, 2=32-bit word registers, etc.
+config DEBUG_UART_BOARD_INIT + bool "Enable board-specific debug UART init" + depends on DEBUG_UART + help + Some boards need to set things up before the debug UART can be used. + On these boards a call to debug_uart_init() is insufficient. When + this option is enabled, the function board_debug_uart_init() will + be called when debug_uart_init() is called. You can put any code + here that is needed to set up the UART ready for use, such as set + pin multiplexing or enable clocks. + config ROCKCHIP_SERIAL bool "Rockchip on-chip UART support" depends on ARCH_UNIPHIER && DM_SERIAL diff --git a/include/debug_uart.h b/include/debug_uart.h index 257ba00..a6b7ce8 100644 --- a/include/debug_uart.h +++ b/include/debug_uart.h @@ -42,6 +42,11 @@ * - Define _debug_uart_putc() as static inline (avoiding stack usage) * - Immediately afterwards, add DEBUG_UART_FUNCS to define the rest of the * functionality (printch(), etc.) + * + * If your board needs additional init for the UART to work, enable + * CONFIG_DEBUG_UART_BOARD_INIT and write a function called + * board_debug_uart_init() to perform that init. When debug_uart_init() is + * called, the init will happen automatically. */
/** @@ -57,6 +62,14 @@ */ void debug_uart_init(void);
+#ifdef CONFIG_DEBUG_UART_BOARD_INIT +void board_debug_uart_init(void); +#else +static inline void board_debug_uart_init(void) +{ +} +#endif + /** * printch() - Output a character to the debug UART * @@ -136,6 +149,7 @@ void printhex8(uint value); \ void debug_uart_init(void) \ { \ + board_debug_uart_init(); \ _debug_uart_init(); \ } \