In very very space-constrained devices even the full UART driver is too large. In this case the debug UART can still be used in some cases.
Add options to enable the UART driver in SPL and U-Boot proper. Enable both options by default.
Signed-off-by: Simon Glass sjg@chromium.org ---
drivers/serial/Kconfig | 20 ++++++++++++++++++++ drivers/serial/serial-uclass.c | 2 ++ 2 files changed, 22 insertions(+)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 1fc287e..04541c9 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -15,6 +15,26 @@ config REQUIRE_SERIAL_CONSOLE during serial port initialization (default y). Set this to n on boards which have no debug serial port whatsoever.
+config SERIAL_PRESENT + bool "Provide a serial driver" + depends on DM_SERIAL + default y + help + In very space-constrained devices even the full UART driver is too + large. In this case the debug UART can still be used in some cases. + This option enables the full UART in U-Boot, so if is it disabled, + the full UART driver will be omitted, thus saving space. + +config SPL_SERIAL_PRESENT + bool "Provide a serial driver in SPL" + depends on DM_SERIAL + default y + help + In very space-constrained devices even the full UART driver is too + large. In this case the debug UART can still be used in some cases. + This option enables the full UART in SPL, so if is it disabled, + the full UART driver will be omitted, thus saving space. + config DM_SERIAL bool "Enable Driver Model for serial drivers" depends on DM diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index 4bf9a5c..95c3b91 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -287,6 +287,7 @@ static int on_baudrate(const char *name, const char *value, enum env_op op, } U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT) static int serial_post_probe(struct udevice *dev) { struct dm_serial_ops *ops = serial_get_ops(dev); @@ -356,3 +357,4 @@ UCLASS_DRIVER(serial) = { .pre_remove = serial_pre_remove, .per_device_auto_alloc_size = sizeof(struct serial_dev_priv), }; +#endif