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[U-Boot,v4,02/33] pinctrl: Add help text to Kconfig

Message ID 1440429171-2555-3-git-send-email-sjg@chromium.org
State Superseded
Delegated to: Tom Rini
Headers show

Commit Message

Simon Glass Aug. 24, 2015, 3:12 p.m. UTC 
The pinctrl Kconfig options should have help messages. Add this to a few
options.

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

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

 drivers/pinctrl/Kconfig | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index c6229d9..30617f0 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -18,6 +18,12 @@  config PINCTRL_GENERIC
 config PINMUX
 	bool "Support pin multiplexing controllers"
 	depends on PINCTRL_GENERIC
+	help
+	  Support pin multiplexing control in U-Boot. 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"
@@ -38,6 +44,13 @@  config SPL_PINCTRL_GENERIC
 config SPL_PINMUX
 	bool "Support pin multiplexing controllers in SPL"
 	depends on SPL_PINCTRL_GENERIC
+	help
+	  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"