[U-Boot] [PATCH v5 01/41] pinctrl: Add help text to Kconfig

[Simon Glass]

The pinctrl Kconfig options should have help messages. Add this to a few
options.

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

Changes in v5:
- Merge with Masahiro's v5 patch

Changes in v4: None
Changes in v3: None
Changes in v2: None

 drivers/pinctrl/Kconfig | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 30b8e45..918a859 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -47,7 +47,10 @@ config PINMUX
 	default y
 	help
 	  This option enables pin multiplexing through the generic pinctrl
-	  framework.
+	  framework. Most SoCs have their own own multiplexing arrangement
+	  where a single pin can be used for several functions. An SoC pinctrl
+	  driver allows the required function to be selected for each pin.
+	  The driver is typically controlled by the device tree.
 
 config PINCONF
 	bool "Support pin configuration controllers"
@@ -86,6 +89,12 @@ config SPL_PINMUX
 	help
 	  This option is an SPL-variant of the PINMUX option.
 	  See the help of PINMUX for details.
+	  The pinctrl subsystem can add a substantial overhead to the SPL
+	  image since it typically requires quite a few tables either in the
+	  driver or in the device tree. If this is acceptable and you need
+	  to adjust pin multiplexing in SPL in order to boot into U-Boot,
+	  enable this option. You will need to enable device tree in SPL
+	  for this to work.
 
 config SPL_PINCONF
 	bool "Support pin configuration controllers in SPL"
-- 
2.5.0.457.gab17608