| Message ID | 20180823150013.21837-1-Eugeniy.Paltsev@synopsys.com |
|---|---|
| Headers | show |
| Series | GPIO: add single-register gpio via creg driver | expand |
On 08/23/2018 08:00 AM, Eugeniy Paltsev wrote: > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig > index 71c0ab46f216..0f9cc1582cab 100644 > --- a/drivers/gpio/Kconfig > +++ b/drivers/gpio/Kconfig > @@ -430,6 +430,15 @@ config GPIO_REG > A 32-bit single register GPIO fixed in/out implementation. This > can be used to represent any register as a set of GPIO signals. > > +config GPIO_SNPS_CREG > + bool "GPIO via CREG (Control REGisers) driver" REGisters) > + select OF_GPIO > + help > + This driver supports GPIOs via CREG on various Synopsys SoCs. > + This is is single-register MMIO gpio driver for complex cases This is a MMIO GPIO > + where only several fields in register belong to GPIO and in a register > + each GPIO owns field with different length and on/off values. maybe: fields with different lengths > + > config GPIO_SPEAR_SPICS > bool "ST SPEAr13xx SPI Chip Select as GPIO support" > depends on PLAT_SPEAR
Add single-register MMIO gpio driver for complex cases where only several fields in register belong to GPIO and each GPIO owns field with different length and on/off values. Here is the example: 31 11 8 7 5 0 < bit number | | | | | | [ not used | gpio-1 | shift-1 | gpio-0 | shift-0 ] < 32 bit MMIO ^ ^ (3 bit) (2 bit) | | | | | write 0x2 == set output to "1" (on) | write 0x3 == set output to "0" (off) | write 0x1 == set output to "1" (on) write 0x4 == set output to "0" (off) This is different from gpio-reg, gpio-mmio and gpio-74xx-mmio: * They all don't support cases when GPIO output register have more than one bit per GPIO line. * They don't support holes in MMIO register. * They don't support cases when GPIO lines have different on/off values. This driver supports GPIOs via CREG on various Synopsys SoCs/boards. Eugeniy Paltsev (2): GPIO: add single-register gpio via creg driver dt-bindings: Document the Synopsys GPIO via CREG bindings .../devicetree/bindings/gpio/snps,creg-gpio.txt | 48 ++++ MAINTAINERS | 6 + drivers/gpio/Kconfig | 9 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-creg-snps.c | 242 +++++++++++++++++++++ 5 files changed, 306 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/snps,creg-gpio.txt create mode 100644 drivers/gpio/gpio-creg-snps.c