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gpio: Support ROHM BD72720 gpios

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The ROHM BD72720 has 6 pins which may be configured as GPIOs. The
GPIO1 ... GPIO5 and EPDEN pins. The configuration is done to OTP at the
manufacturing, and it can't be read at runtime. The device-tree is
required to tell the software which of the pins are used as GPIOs.

Keep the pin mapping static regardless the OTP. This way the user-space
can always access the BASE+N for GPIO(N+1) (N = 0 to 4), and BASE + 5
for the EPDEN pin. Do this by setting always the number of GPIOs to 6,
and by using the valid-mask to invalidate the pins which aren't configured
as GPIOs.

First two pins can be set to be either input or output by OTP. Direction
can't be changed by software. Rest of the pins can be set as outputs
only. All of the pins support generating interrupts.

Support the Input/Output state getting/setting and the output mode
configuration (open-drain/push-pull).

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/22e095ca92f0677ca3d3a768ad749629fc3c2006.1765804226.git.mazziesaccount@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Matti Vaittinen
2025-12-15 15:20:24 +02:00
committed by Lee Jones
parent f16a9d76a7
commit 6b367741e0
3 changed files with 291 additions and 0 deletions
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9
drivers/gpio/Kconfig
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@@ -1317,6 +1317,15 @@ config GPIO_BD71828
This driver can also be built as a module. If so, the module
will be called gpio-bd71828.
config GPIO_BD72720
tristate "ROHM BD72720 and BD73900 PMIC GPIO support"
depends on MFD_ROHM_BD71828
help
Support for GPIO on ROHM BD72720 and BD73900 PMICs. There are two
pins which can be configured to GPI or GPO, and three pins which can
be configured to GPO on the ROHM PMIC. The pin configuration is done
on OTP at manufacturing.
config GPIO_BD9571MWV
tristate "ROHM BD9571 GPIO support"
depends on MFD_BD9571MWV