Commit 458a0700 authored by Simon Glass's avatar Simon Glass

pinctrl: Add help text to Kconfig

The pinctrl Kconfig options should have help messages. Add this to a few
options.
Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
parent b7e84c93
......@@ -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"
......
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