[U-Boot] [PATCH v2 2/6] x86: video: Allow keyboard presence to be controlled by device tree

[Simon Glass]

At present a VGA console assumes a keyboard unless a CONFIG option is set.
This difference can be dealt with by a device tree option, allowing boards
that are otherwise the same to use the same configuration.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Correct #ifdef setup to avoid build errors on non-x86 boards

 doc/README.fdt-control      | 16 ++++++++++++++++
 drivers/video/cfb_console.c | 29 +++++++++++++++++++++--------
 2 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/doc/README.fdt-control b/doc/README.fdt-control
index d8fe4a8..e6d5ed0 100644
--- a/doc/README.fdt-control
+++ b/doc/README.fdt-control
@@ -171,6 +171,22 @@ After board configuration is done, fdt supported u-boot can be build in two ways
     $ make DEVICE_TREE=<dts-file-name>
 
 
+Configuration Options
+---------------------
+
+A number of run-time configuration options are provided in the /config node
+of the control device tree. You can access these using fdtdec_get_config_int(),
+fdtdec_get_config_bool() and fdtdec_get_config_string().
+
+Available options are:
+
+silent-console
+	If present and non-zero, the console is silenced by default on boot.
+
+no-keyboard
+	Tells U-Boot not to expect an attached keyboard with a VGA console
+
+
 Limitations
 -----------
 
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index a81affa..f4231b8 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -87,6 +87,7 @@
  */
 
 #include <common.h>
+#include <fdtdec.h>
 #include <version.h>
 #include <malloc.h>
 #include <linux/compiler.h>
@@ -2251,6 +2252,7 @@ int drv_video_init(void)
 {
 	int skip_dev_init;
 	struct stdio_dev console_dev;
+	bool have_keyboard;
 
 	/* Check if video initialization should be skipped */
 	if (board_video_skip())
@@ -2262,11 +2264,20 @@ int drv_video_init(void)
 	if (board_cfb_skip())
 		return 0;
 
+#if defined(CONFIG_VGA_AS_SINGLE_DEVICE)
+	have_keyboard = false;
+#elif defined(CONFIG_OF_CONTROL)
+	have_keyboard = !fdtdec_get_config_bool(gd->fdt_blob,
+						"u-boot,no-keyboard");
+#else
+	have_keyboard = true;
+#endif
+	if (have_keyboard) {
+		debug("KBD: Keyboard init ...\n");
 #if !defined(CONFIG_VGA_AS_SINGLE_DEVICE)
-	debug("KBD: Keyboard init ...\n");
-	skip_dev_init |= (VIDEO_KBD_INIT_FCT == -1);
+		skip_dev_init |= (VIDEO_KBD_INIT_FCT == -1);
 #endif
-
+	}
 	if (skip_dev_init)
 		return 0;
 
@@ -2279,11 +2290,13 @@ int drv_video_init(void)
 	console_dev.puts = video_puts;	/* 'puts' function */
 
 #if !defined(CONFIG_VGA_AS_SINGLE_DEVICE)
-	/* Also init console device */
-	console_dev.flags |= DEV_FLAGS_INPUT;
-	console_dev.tstc = VIDEO_TSTC_FCT;	/* 'tstc' function */
-	console_dev.getc = VIDEO_GETC_FCT;	/* 'getc' function */
-#endif /* CONFIG_VGA_AS_SINGLE_DEVICE */
+	if (have_keyboard) {
+		/* Also init console device */
+		console_dev.flags |= DEV_FLAGS_INPUT;
+		console_dev.tstc = VIDEO_TSTC_FCT;	/* 'tstc' function */
+		console_dev.getc = VIDEO_GETC_FCT;	/* 'getc' function */
+	}
+#endif
 
 	if (stdio_register(&console_dev) != 0)
 		return 0;
-- 
2.2.0.rc0.207.ga3a616c