On 8 December 2014 at 15:41, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > Hi Rafał, > > On Mon, Dec 8, 2014 at 3:27 PM, Rafał Miłecki <zajec5@xxxxxxxxx> wrote: >> SN54HC595 and SN74HC595 are devices based on shift registers controlled >> with 5 input signals (serial-in) and providing 8 outputs (parallel-out). >> >> They are present on some Broadcom home router boards where manufacturer >> needed few extra GPIOs. >> >> This driver simply uses specified GPIOs to control shift registers and >> registers another GPIO chip. So you can call it a GPIO extender. >> >> Due to the hardware design only output direction is supported. Reading >> values is handled using tiny internal cache. >> >> Signed-off-by: Rafał Miłecki <zajec5@xxxxxxxxx> >> --- >> .../devicetree/bindings/gpio/gpio-sn54hc595.txt | 35 ++++ >> drivers/gpio/Kconfig | 11 ++ >> drivers/gpio/Makefile | 1 + >> drivers/gpio/gpio-sn54hc595.c | 219 +++++++++++++++++++++ > > The '595 is already handled by drivers/gpio/gpio-74x164.c. gpio-74x164.c seems to be tight closely to the SPI. In my case it's GPIO-controller '595. Do you have any other idea how we could handle this? -- Rafał -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
