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dm: pinctrl: introduce PINCONF_RECURSIVE option

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In the Linux pinctrl binding, the pin configuration nodes don't need to
be direct children of the pin controller device (may be grandchildren for
example). This behavior is managed with the pinconfig u-class which
recursively bind all the sub-node of the pin controller.

But for some binding (when pin configuration is only children of pin
controller) that is not necessary. U-Boot can save memory and reduce
the number of pinconf instance when this feature is deactivated
(for arch stm32mp for example for SPL).

This patch allows to control this feature with a new option
CONFIG_PINCONF_RECURSIVE when it is possible for each individual
pin controller device.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrick Delaunay 2019-08-02 14:48:00 +02:00 committed by Simon Glass
parent d1d5ffd554
commit c20851b3d8
2 changed files with 27 additions and 0 deletions
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25
drivers/pinctrl/Kconfig
View File

@ -59,6 +59,22 @@ config PINCONF
This option enables pin configuration through the generic pinctrl
framework.
config PINCONF_RECURSIVE
bool "Support recursive binding for pin configuration nodes"
depends on PINCTRL_FULL
default n if ARCH_STM32MP
default y
help
In the Linux pinctrl binding, the pin configuration nodes need not be
direct children of the pin controller device (may be grandchildren for
example). It is define is each individual pin controller device.
Say Y here if you want to keep this behavior with the pinconfig
u-class: all sub are recursivelly bounded.
If the option is disabled, this behavior is deactivated and only
the direct children of pin controller will be assumed as pin
configuration; you can save memory footprint when this feature is
no needed.
config SPL_PINCTRL
bool "Support pin controllers in SPL"
depends on SPL && SPL_DM
@ -104,6 +120,15 @@ config SPL_PINCONF
This option is an SPL-variant of the PINCONF option.
See the help of PINCONF for details.
config SPL_PINCONF_RECURSIVE
bool "Support recursive binding for pin configuration nodes in SPL"
depends on SPL_PINCTRL_FULL
default n if ARCH_STM32MP
default y
help
This option is an SPL-variant of the PINCONF_RECURSIVE option.
See the help of PINCONF_RECURSIVE for details.
if PINCTRL || SPL_PINCTRL
config PINCTRL_AR933X

2
drivers/pinctrl/pinctrl-uclass.c
View File

@ -151,7 +151,9 @@ static int pinconfig_post_bind(struct udevice *dev)
UCLASS_DRIVER(pinconfig) = {
.id = UCLASS_PINCONFIG,
#if CONFIG_IS_ENABLED(PINCONFIG_RECURSIVE)
.post_bind = pinconfig_post_bind,
#endif
.name = "pinconfig",
};