This SGPIO controller is for NUVOTON NPCM7xx and NPCM8xx SoC. Nuvoton NPCM SGPIO module is combine serial to parallel IC (HC595) and parallel to serial IC (HC165), and use APB3 clock to control it. This interface has 4 pins (D_out , D_in, S_CLK, LDSH). NPCM7xx/NPCM8xx have two sgpio module each module can support up to 64 output pins,and up to 64 input pin, the pin is only for GPI or GPO. GPIO pins have sequential, First half is GPO and second half is GPI. Jim Liu (3): dt-bindings: gpio: add NPCM sgpio driver bindings arm: dts: nuvoton: npcm: Add sgpio feature gpio: nuvoton: Add Nuvoton NPCM sgpio driver .../bindings/gpio/nuvoton,sgpio.yaml | 86 +++ .../dts/nuvoton/nuvoton-common-npcm7xx.dtsi | 24 + drivers/gpio/Kconfig | 7 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-npcm-sgpio.c | 635 ++++++++++++++++++ 5 files changed, 753 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/nuvoton,sgpio.yaml create mode 100644 drivers/gpio/gpio-npcm-sgpio.c -- 2.25.1
