pinctrl: at91: add pinctrl driver

AT91 PIO controller is a combined gpio-controller, pin-mux and
pin-config module. The peripheral's pins are assigned through
per-pin based muxing logic.

Each SoC will have to describe the its limitation and pin
configuration via device tree. This will allow to do not need
to touch the C code when adding new SoC if the IP version is
supported.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 9d0f501..355aeae 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -150,6 +150,20 @@ config ROCKCHIP_RK3288_PINCTRL
 	  definitions and pin control functions for each available multiplex
 	  function.
 
+config PINCTRL_AT91
+	bool "AT91 pinctrl driver"
+	depends on DM
+	help
+	  This option is to enable the AT91 pinctrl driver for AT91 PIO
+	  controller. AT91 PIO controller is a combined gpio-controller,
+	  pin-mux and pin-config module. Each I/O pin may be dedicated as
+	  a general-purpose I/O or be assigned to a function of an embedded
+	  peripheral. Each I/O pin has a glitch filter providing rejection of
+	  glitches lower than one-half of peripheral clock cycle and
+	  a debouncing filter providing rejection of unwanted pulses from key
+	  or push button operations. You can also control the multi-driver
+	  capability, pull-up and pull-down feature on each I/O pin.
+
 config PINCTRL_AT91PIO4
 	bool "AT91 PIO4 pinctrl driver"
 	depends on DM