qiurui
/
Centos-kernel-stream-9
mirror of https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

gpio: mlxbf3: Support add_pin_ranges() 

JIRA: https://issues.redhat.com/browse/RHEL-21113

commit 38a700efc51080c7184f71edbf5e49561da9754f
Author: Asmaa Mnebhi <asmaa@nvidia.com>
Date: Fri, 18 Aug 2023 12:43:14 -0400

    Support add_pin_ranges() so that pinctrl_gpio_request() can be called.
    The GPIO value is not modified when the user runs the "gpioset" tool.
    This is because when gpiochip_generic_request is invoked by the gpio-mlxbf3
    driver, "pin_ranges" is empty so it skips "pinctrl_gpio_request()".
    pinctrl_gpio_request() is essential in the code flow because it changes the
    mux value so that software has control over modifying the GPIO value.
    Adding add_pin_ranges() creates a dependency on the pinctrl-mlxbf3.c driver.

    Fixes: cd33f216d24 ("gpio: mlxbf3: Add gpio driver support")
    Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
    Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
    Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
    Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Signed-off-by: Nirmala Dalvi <ndalvi@redhat.com>
This commit is contained in:
Nirmala Dalvi 2024-03-07 14:14:06 -05:00
parent 558d47f80e
commit 8214752713
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/gpio/gpio-mlxbf3.c
View File

@ -19,6 +19,8 @@
* gpio[1]: HOST_GPIO32->HOST_GPIO55
*/
#define MLXBF3_GPIO_MAX_PINS_PER_BLOCK 32
#define MLXBF3_GPIO_MAX_PINS_BLOCK0 32
#define MLXBF3_GPIO_MAX_PINS_BLOCK1 24
/*
* fw_gpio[x] block registers and their offset
@ -158,6 +160,26 @@ static const struct irq_chip gpio_mlxbf3_irqchip = {
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static int mlxbf3_gpio_add_pin_ranges(struct gpio_chip *chip)
{
unsigned int id;
switch(chip->ngpio) {
case MLXBF3_GPIO_MAX_PINS_BLOCK0:
id = 0;
break;
case MLXBF3_GPIO_MAX_PINS_BLOCK1:
id = 1;
break;
default:
return -EINVAL;
}
return gpiochip_add_pin_range(chip, "MLNXBF34:00",
chip->base, id * MLXBF3_GPIO_MAX_PINS_PER_BLOCK,
chip->ngpio);
}
static int mlxbf3_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -197,6 +219,7 @@ static int mlxbf3_gpio_probe(struct platform_device *pdev)
gc->request = gpiochip_generic_request;
gc->free = gpiochip_generic_free;
gc->owner = THIS_MODULE;
gc->add_pin_ranges = mlxbf3_gpio_add_pin_ranges;
irq = platform_get_irq(pdev, 0);
if (irq >= 0) {
@ -243,6 +266,7 @@ static struct platform_driver mlxbf3_gpio_driver = {
};
module_platform_driver(mlxbf3_gpio_driver);
MODULE_SOFTDEP("pre: pinctrl-mlxbf3");
MODULE_DESCRIPTION("NVIDIA BlueField-3 GPIO Driver");
MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");
MODULE_LICENSE("Dual BSD/GPL");