Am 01.10.2021 um 15:52 schrieb Tom Rini:
On Fri, Oct 01, 2021 at 01:37:57PM +0200, Hannes Schmelzer wrote:
This commit adds support for the MAX7320 (and clones) gpio expander.
Signed-off-by: Hannes Schmelzer hannes.schmelzer@br-automation.com
doc/device-tree-bindings/gpio/gpio-max7320.txt | 36 ++++++++ drivers/gpio/Kconfig | 8 ++ drivers/gpio/Makefile | 1 + drivers/gpio/max7320_gpio.c | 113 +++++++++++++++++++++++++ 4 files changed, 158 insertions(+) create mode 100644 doc/device-tree-bindings/gpio/gpio-max7320.txt create mode 100644 drivers/gpio/max7320_gpio.c
diff --git a/doc/device-tree-bindings/gpio/gpio-max7320.txt b/doc/device-tree-bindings/gpio/gpio-max7320.txt new file mode 100644 index 0000000..87b703b --- /dev/null +++ b/doc/device-tree-bindings/gpio/gpio-max7320.txt @@ -0,0 +1,36 @@ +* MAX7320 I/O expanders
+The original maxim 7320 i/o expander offers 8 bit push/pull outputs. +There exists some clones which offers 16 bit.
+Required Properties:
- compatible: should be one of the following.
- "maxim,max7320"
- reg: I2C slave address.
- gpio-controller: Marks the device node as a gpio controller.
- #gpio-cells: Should be 2. The first cell is the GPIO number and the second
- cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>. Only the
- GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
+Optional Properties:
- ngpios: tell the driver how many gpios the device offers.
if the property is omitted, 8bit (original maxim) is assumed.+Please refer to gpio.txt in this directory for details of the common GPIO +bindings used by client devices.
+Example: MAX7320 I/O expander node
- ledgpio: max7320@5d {
status = "okay";compatible = "maxim,max7320";reg = <0x5d>;#gpio-cells = <2>;gpio-controller;ngpios = <16>;- };
Where does this binding come from? Thanks!
Hi Tom,
i took it from 'doc/device-tree-bindings/gpio/gpio-pcf857x.txt' and adapted it for my needs.
cheers, Hannes