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gpiolib: allow to specify the firmware node in struct gpio_chip

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Software nodes allow us to represent hierarchies for device components
that don't have their struct device representation yet - for instance:
banks of GPIOs under a common GPIO expander. The core gpiolib core
however doesn't offer any way of passing this information from the
drivers.

This extends struct gpio_chip with a pointer to fwnode that can be set
by the driver and used to pass device properties for child nodes.

This is similar to how we handle device-tree sub-nodes with
CONFIG_OF_GPIO enabled.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2021-12-13 11:16:41 +01:00
parent dd61b29207
commit 990f6756bb
2 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpio/gpiolib.c
View File

@ -593,7 +593,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
struct lock_class_key *lock_key,
struct lock_class_key *request_key)
{
struct fwnode_handle *fwnode = gc->parent ? dev_fwnode(gc->parent) : NULL;
struct fwnode_handle *fwnode = NULL;
struct gpio_device *gdev;
unsigned long flags;
int base = gc->base;
@ -601,6 +601,11 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
int ret = 0;
u32 ngpios;
if (gc->fwnode)
fwnode = gc->fwnode;
else if (gc->parent)
fwnode = dev_fwnode(gc->parent);
/*
* First: allocate and populate the internal stat container, and
* set up the struct device.

2
include/linux/gpio/driver.h
View File

@ -289,6 +289,7 @@ struct gpio_irq_chip {
* number or the name of the SoC IP-block implementing it.
* @gpiodev: the internal state holder, opaque struct
* @parent: optional parent device providing the GPIOs
* @fwnode: optional fwnode providing this controller's properties
* @owner: helps prevent removal of modules exporting active GPIOs
* @request: optional hook for chip-specific activation, such as
* enabling module power and clock; may sleep
@ -377,6 +378,7 @@ struct gpio_chip {
const char *label;
struct gpio_device *gpiodev;
struct device *parent;
struct fwnode_handle *fwnode;
struct module *owner;
int (*request)(struct gpio_chip *gc,