diff options
| author | Sander Vanheule <sander@svanheule.net> | 2021-03-30 19:48:43 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2021-05-05 16:07:40 +0200 |
| commit | 0d82fb1127fb7cc8287614eb0992acb0583bc323 (patch) | |
| tree | 49ff43f5c5bb86f1b7cb4a95c9ba6ed690b254cb /drivers/gpio/Kconfig | |
| parent | 951f7da9f60bf62d26dd0f8b71d5671ab3929ba2 (diff) | |
| download | linux-0d82fb1127fb7cc8287614eb0992acb0583bc323.tar.bz2 | |
gpio: Add Realtek Otto GPIO support
Realtek MIPS SoCs (platform name Otto) have GPIO controllers with up to
64 GPIOs, divided over two banks. Each bank has a set of registers for
32 GPIOs, with support for edge-triggered interrupts.
Each GPIO bank consists of four 8-bit GPIO ports (ABCD and EFGH). Most
registers pack one bit per GPIO, except for the IMR register, which
packs two bits per GPIO (AB-CD).
Although the byte order is currently assumed to have port A..D at offset
0x0..0x3, this has been observed to be reversed on other, Lexra-based,
SoCs (e.g. RTL8196E/97D/97F).
Interrupt support is disabled for the fallback devicetree-compatible
'realtek,otto-gpio'. This allows for quick support of GPIO banks in
which the byte order would be unknown. In this case, the port ordering
in the IMR registers may not match the reversed order in the other
registers (DCBA, and BA-DC or DC-BA).
Signed-off-by: Sander Vanheule <sander@svanheule.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/gpio/Kconfig')
| -rw-r--r-- | drivers/gpio/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e3607ec4c2e8..6fb13d6507db 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -502,6 +502,19 @@ config GPIO_RDA help Say Y here to support RDA Micro GPIO controller. +config GPIO_REALTEK_OTTO + tristate "Realtek Otto GPIO support" + depends on MACH_REALTEK_RTL + default MACH_REALTEK_RTL + select GPIO_GENERIC + select GPIOLIB_IRQCHIP + help + The GPIO controller on the Otto MIPS platform supports up to two + banks of 32 GPIOs, with edge triggered interrupts. The 32 GPIOs + are grouped in four 8-bit wide ports. + + When built as a module, the module will be called realtek_otto_gpio. + config GPIO_REG bool help |