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Date: Fri, 12 Mar 2021 12:07:08 +0100
From: Bartosz Golaszewski <bgolaszewski@...libre.com>
To: Ran Wang <ran.wang_1@....com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
linux-gpio <linux-gpio@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: mpc8xxx: Add ACPI support
On Fri, Mar 12, 2021 at 7:51 AM Ran Wang <ran.wang_1@....com> wrote:
>
> Current implementation only supports DT, now add ACPI support.
>
> Note that compared to device of 'fsl,qoriq-gpio', LS1028A and
> LS1088A's GPIO have no extra programming, so simplify related checking.
>
> Signed-off-by: Ran Wang <ran.wang_1@....com>
> ---
> drivers/gpio/gpio-mpc8xxx.c | 50 +++++++++++++++++++++++++++----------
> 1 file changed, 37 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
> index 6dfca83bcd90..de5b7e17cde3 100644
> --- a/drivers/gpio/gpio-mpc8xxx.c
> +++ b/drivers/gpio/gpio-mpc8xxx.c
> @@ -9,6 +9,7 @@
> * kind, whether express or implied.
> */
>
> +#include <linux/acpi.h>
> #include <linux/kernel.h>
> #include <linux/init.h>
> #include <linux/spinlock.h>
> @@ -292,8 +293,6 @@ static const struct of_device_id mpc8xxx_gpio_ids[] = {
> { .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
> { .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
> { .compatible = "fsl,pq3-gpio", },
> - { .compatible = "fsl,ls1028a-gpio", },
> - { .compatible = "fsl,ls1088a-gpio", },
Why are you removing support for those?
Bart
> { .compatible = "fsl,qoriq-gpio", },
> {}
> };
> @@ -303,10 +302,19 @@ static int mpc8xxx_probe(struct platform_device *pdev)
> struct device_node *np = pdev->dev.of_node;
> struct mpc8xxx_gpio_chip *mpc8xxx_gc;
> struct gpio_chip *gc;
> - const struct mpc8xxx_gpio_devtype *devtype =
> - of_device_get_match_data(&pdev->dev);
> + const struct mpc8xxx_gpio_devtype *devtype;
> + const struct acpi_device_id *acpi_id;
> int ret;
>
> + if (pdev->dev.of_node) {
> + devtype = of_device_get_match_data(&pdev->dev);
> + } else {
> + acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
> + &pdev->dev);
> + if (acpi_id)
> + devtype = (struct mpc8xxx_gpio_devtype *) acpi_id->driver_data;
> + }
> +
> mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
> if (!mpc8xxx_gc)
> return -ENOMEM;
> @@ -315,14 +323,14 @@ static int mpc8xxx_probe(struct platform_device *pdev)
>
> raw_spin_lock_init(&mpc8xxx_gc->lock);
>
> - mpc8xxx_gc->regs = of_iomap(np, 0);
> + mpc8xxx_gc->regs = devm_platform_ioremap_resource(pdev, 0);
> if (!mpc8xxx_gc->regs)
> return -ENOMEM;
>
> gc = &mpc8xxx_gc->gc;
> gc->parent = &pdev->dev;
>
> - if (of_property_read_bool(np, "little-endian")) {
> + if (device_property_read_bool(&pdev->dev, "little-endian")) {
> ret = bgpio_init(gc, &pdev->dev, 4,
> mpc8xxx_gc->regs + GPIO_DAT,
> NULL, NULL,
> @@ -369,10 +377,14 @@ static int mpc8xxx_probe(struct platform_device *pdev)
> * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
> * the port value to the GPIO Data Register.
> */
> - if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
> - of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
> - of_device_is_compatible(np, "fsl,ls1088a-gpio"))
> - gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
> + if (pdev->dev.of_node) {
> + if (of_device_is_compatible(np, "fsl,qoriq-gpio"))
> + gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
> + } else {
> + if (acpi_match_device(pdev->dev.driver->acpi_match_table,
> + &pdev->dev))
> + gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
> + }
>
> ret = gpiochip_add_data(gc, mpc8xxx_gc);
> if (ret) {
> @@ -381,12 +393,15 @@ static int mpc8xxx_probe(struct platform_device *pdev)
> goto err;
> }
>
> - mpc8xxx_gc->irqn = irq_of_parse_and_map(np, 0);
> + mpc8xxx_gc->irqn = platform_get_irq(pdev, 0);
> if (!mpc8xxx_gc->irqn)
> return 0;
>
> - mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
> - &mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
> + mpc8xxx_gc->irq = irq_domain_create_linear(dev_fwnode(&pdev->dev),
> + MPC8XXX_GPIO_PINS,
> + &mpc8xxx_gpio_irq_ops,
> + mpc8xxx_gc);
> +
> if (!mpc8xxx_gc->irq)
> return 0;
>
> @@ -425,12 +440,21 @@ static int mpc8xxx_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id gpio_acpi_ids[] = {
> + {"NXP0031",},
> + { }
> +};
> +MODULE_DEVICE_TABLE(acpi, gpio_acpi_ids);
> +#endif
> +
> static struct platform_driver mpc8xxx_plat_driver = {
> .probe = mpc8xxx_probe,
> .remove = mpc8xxx_remove,
> .driver = {
> .name = "gpio-mpc8xxx",
> .of_match_table = mpc8xxx_gpio_ids,
> + .acpi_match_table = ACPI_PTR(gpio_acpi_ids),
> },
> };
>
> --
> 2.25.1
>
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