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authorSimon Glass <sjg@chromium.org>2015-12-14 04:36:58 (GMT)
committerSimon Glass <sjg@chromium.org>2016-01-12 17:19:09 (GMT)
commit92c55b682cf24dc454d95149d3476dc66d514555 (patch)
tree606529151644a1ef23dd6f0a31317be4da357f56
parentd4f847ecd789c8b99d98a512e85406255fa192ce (diff)
downloadu-boot-92c55b682cf24dc454d95149d3476dc66d514555.tar.xz
dm: serial: Allow the UART driver to be dropped from the image
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> Reviewed-by: Thomas Chou <thomas@wytron.com.tw>
-rw-r--r--drivers/serial/Kconfig20
-rw-r--r--drivers/serial/serial-uclass.c4
2 files changed, 23 insertions, 1 deletions
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..1c447ff 100644
--- a/drivers/serial/serial-uclass.c
+++ b/drivers/serial/serial-uclass.c
@@ -204,7 +204,7 @@ void serial_stdio_init(void)
{
}
-#ifdef CONFIG_DM_STDIO
+#if defined(CONFIG_DM_STDIO) && CONFIG_IS_ENABLED(SERIAL_PRESENT)
static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
{
_serial_putc(sdev->priv, ch);
@@ -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