diff mbox

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

Message ID 1440975352-28528-2-git-send-email-sjg@chromium.org
State Accepted
Delegated to: Simon Glass
Headers show

Commit Message

Simon Glass Aug. 30, 2015, 10:55 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 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(-)

Comments

Simon Glass Sept. 3, 2015, 5:57 p.m. UTC | #1 
On 30 August 2015 at 16:55, Simon Glass <sjg@chromium.org> wrote:
> The pinctrl Kconfig options should have help messages. Add this to a few
> options.
>
> Signed-off-by: Simon Glass <sjg@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(-)

Applied to u-boot-rockchip.
diff mbox

Patch

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"