tree feb9d494eed4d15a942c06dcdef3fa39b8790212
parent c4b4ef0d88894d19c701205e6520848c2ab9db2c
author Patrice Chotard <patrice.chotard@st.com> 1540383018 +0200
committer Tom Rini <trini@konsulko.com> 1542405116 -0500

pinctrl: stm32: Add get_pins_count() ops

Add get_pins_count ops to obtain the number of pins
owns by a pin-controller.
On STM32 SoCs bindings, each pin-controller owns
several gpio banks. Each GPIO bank can own up to 16 pins.

To obtain the total pins count, walk through each sub-nodes
(ie GPIO banks) and sum each GPIO banks pins number. For that
in probe() we build a list with each GPIO device reference found.
This list will also be used with future get_pin_muxing and get_pin_name
ops to speed up and optimize walk through all GPIO banks.

As this code is common to all STM32 SoCs, this code is put
under SPL_BUILD compilation flag to avoid to increase SPL code size
for STM32F7 which is limited to 32Ko.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>