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| author | Simon Glass <sjg@chromium.org> | 2015-08-30 16:55:12 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-09-02 21:28:22 -0600 |
| commit | 458a070076dc920a7106f0c8f0cfa880503ce498 (patch) | |
| tree | c65e1f38334896f4f7b736795164943edb2c3d66 /drivers/pinctrl | |
| parent | b7e84c93c450480ca4ff51ad2eb56bd83c1dc368 (diff) | |
| download | u-boot-imx-458a070076dc920a7106f0c8f0cfa880503ce498.zip u-boot-imx-458a070076dc920a7106f0c8f0cfa880503ce498.tar.gz u-boot-imx-458a070076dc920a7106f0c8f0cfa880503ce498.tar.bz2 | |
pinctrl: Add help text to Kconfig
The pinctrl Kconfig options should have help messages. Add this to a few
options.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/pinctrl')
| -rw-r--r-- | drivers/pinctrl/Kconfig | 11 |
1 files changed, 10 insertions, 1 deletions
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" |