dm: gpio: introduce 74x164 driver
Introduce driver to support "fairchild,74hc595" devices.
1. Take linux drivers/drivers/gpio/gpio-74x164.c as reference.
2. Following the naming used in Linux driver with gen_7x164 as the prefix.
3. Enable CONFIG_DM_74X164 to use this driver.
4. Follow Documentation/devicetree/bindings/gpio/gpio-74x164.txt to add device
nodes
5. Tested on i.MX6 UltraLite with 74LV595 using gpio command and oscillograph.
Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Chin Liang See <clsee@altera.com>
Cc: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index e6337c2..93a7e8c 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -143,6 +143,14 @@
help
Supports GPIO access on Zynq SoC.
+config DM_74X164
+ bool "74x164 serial-in/parallel-out 8-bits shift register"
+ depends on DM_GPIO
+ help
+ Driver for 74x164 compatible serial-in/parallel-out 8-outputs
+ shift registers, such as 74lv165, 74hc595.
+ This driver can be used to provide access to more gpio outputs.
+
config DM_PCA953X
bool "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
depends on DM_GPIO