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

Simon Glass
2015-08-24T15:12:20Z

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(+)

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"
--
2.5.0.457.gab17608