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From:   Ran Wang <ran.wang_1@nxp.com>
To:     Linus Walleij <linus.walleij@linaro.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Michael Walle <michael@walle.cc>
CC:     "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Ran Wang <ran.wang_1@nxp.com>
Subject: RE: [PATCH v4] gpio: mpc8xxx: Add ACPI support
Thread-Topic: [PATCH v4] gpio: mpc8xxx: Add ACPI support
Thread-Index: AQHXHsvnTdlcbx9xZ0aLPy5qSiDFR6qmz/cQ
Date:   Tue, 6 Apr 2021 01:49:57 +0000
Message-ID: <AM6PR04MB54134144991AB746382FCC0BF1769@AM6PR04MB5413.eurprd04.prod.outlook.com>
References: <20210322033846.39882-1-ran.wang_1@nxp.com>
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Hello,

On Monday, March 22, 2021 11:39 AM, Ran Wang wrote:
>=20
> Current implementation only supports DT, now add ACPI support.
>=20
> Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
> ---
> Change in v4:
>  - Update error print for gpiochip_add_data() to fix wrong info. in ACPI =
case.
>  - Update error print for devm_request_irq() to fix panic in ACPI case.
>  - Add include property.h and mod_devicetable.h.
>  - Correct error handling for mpc8xxx_gc->regs.
>  - Replace "!(IS_ERR_OR_NULL(fwnode) || is_of_node(fwnode)))" with "is_ac=
pi_node(fwnode)"

Could this version be accepted, or any comment/suggestion?

Thanks & Regards,
Ran

=20
> Change in v3:
>  - Recover ls1028a and ls1088a compatilbe checking logic
>=20
> Change in v2:
>  - Initialize devtype with NULL to fix compile warning.
>  - Replace of_device_get_match_data() and acpi_match_device with device_g=
et_match_data().
>  - Replace acpi_match_device() with simpler checking logic per Andy's sug=
gestion.
>=20
>  drivers/gpio/gpio-mpc8xxx.c | 47 ++++++++++++++++++++++++++-----------
>  1 file changed, 33 insertions(+), 14 deletions(-)
>=20
> diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c in=
dex 6dfca83bcd90..4b9157a69fca 100644
> --- a/drivers/gpio/gpio-mpc8xxx.c
> +++ b/drivers/gpio/gpio-mpc8xxx.c
> @@ -9,6 +9,7 @@
>   * kind, whether express or implied.
>   */
>=20
> +#include <linux/acpi.h>
>  #include <linux/kernel.h>
>  #include <linux/init.h>
>  #include <linux/spinlock.h>
> @@ -18,6 +19,8 @@
>  #include <linux/of_address.h>
>  #include <linux/of_irq.h>
>  #include <linux/of_platform.h>
> +#include <linux/property.h>
> +#include <linux/mod_devicetable.h>
>  #include <linux/slab.h>
>  #include <linux/irq.h>
>  #include <linux/gpio/driver.h>
> @@ -303,8 +306,8 @@ static int mpc8xxx_probe(struct platform_device *pdev=
)
>  	struct device_node *np =3D pdev->dev.of_node;
>  	struct mpc8xxx_gpio_chip *mpc8xxx_gc;
>  	struct gpio_chip	*gc;
> -	const struct mpc8xxx_gpio_devtype *devtype =3D
> -		of_device_get_match_data(&pdev->dev);
> +	const struct mpc8xxx_gpio_devtype *devtype =3D NULL;
> +	struct fwnode_handle *fwnode;
>  	int ret;
>=20
>  	mpc8xxx_gc =3D devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL=
); @@ -315,14 +318,14 @@ static int
> mpc8xxx_probe(struct platform_device *pdev)
>=20
>  	raw_spin_lock_init(&mpc8xxx_gc->lock);
>=20
> -	mpc8xxx_gc->regs =3D of_iomap(np, 0);
> -	if (!mpc8xxx_gc->regs)
> -		return -ENOMEM;
> +	mpc8xxx_gc->regs =3D devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(mpc8xxx_gc->regs))
> +		return PTR_ERR(mpc8xxx_gc->regs);
>=20
>  	gc =3D &mpc8xxx_gc->gc;
>  	gc->parent =3D &pdev->dev;
>=20
> -	if (of_property_read_bool(np, "little-endian")) {
> +	if (device_property_read_bool(&pdev->dev, "little-endian")) {
>  		ret =3D bgpio_init(gc, &pdev->dev, 4,
>  				 mpc8xxx_gc->regs + GPIO_DAT,
>  				 NULL, NULL,
> @@ -345,6 +348,7 @@ static int mpc8xxx_probe(struct platform_device *pdev=
)
>=20
>  	mpc8xxx_gc->direction_output =3D gc->direction_output;
>=20
> +	devtype =3D device_get_match_data(&pdev->dev);
>  	if (!devtype)
>  		devtype =3D &mpc8xxx_gpio_devtype_default;
>=20
> @@ -369,24 +373,29 @@ static int mpc8xxx_probe(struct platform_device *pd=
ev)
>  	 * associated input enable must be set (GPIOxGPIE[IEn]=3D1) to propagat=
e
>  	 * the port value to the GPIO Data Register.
>  	 */
> +	fwnode =3D dev_fwnode(&pdev->dev);
>  	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"))
> +	    of_device_is_compatible(np, "fsl,ls1088a-gpio") ||
> +	    is_acpi_node(fwnode))
>  		gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
>=20
>  	ret =3D gpiochip_add_data(gc, mpc8xxx_gc);
>  	if (ret) {
> -		pr_err("%pOF: GPIO chip registration failed with status %d\n",
> -		       np, ret);
> +		dev_err(&pdev->dev,
> +			"GPIO chip registration failed with status %d\n", ret);
>  		goto err;
>  	}
>=20
> -	mpc8xxx_gc->irqn =3D irq_of_parse_and_map(np, 0);
> +	mpc8xxx_gc->irqn =3D platform_get_irq(pdev, 0);
>  	if (!mpc8xxx_gc->irqn)
>  		return 0;
>=20
> -	mpc8xxx_gc->irq =3D irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
> -					&mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
> +	mpc8xxx_gc->irq =3D irq_domain_create_linear(fwnode,
> +						   MPC8XXX_GPIO_PINS,
> +						   &mpc8xxx_gpio_irq_ops,
> +						   mpc8xxx_gc);
> +
>  	if (!mpc8xxx_gc->irq)
>  		return 0;
>=20
> @@ -399,8 +408,9 @@ static int mpc8xxx_probe(struct platform_device *pdev=
)
>  			       IRQF_SHARED, "gpio-cascade",
>  			       mpc8xxx_gc);
>  	if (ret) {
> -		dev_err(&pdev->dev, "%s: failed to devm_request_irq(%d), ret =3D %d\n"=
,
> -			np->full_name, mpc8xxx_gc->irqn, ret);
> +		dev_err(&pdev->dev,
> +			"failed to devm_request_irq(%d), ret =3D %d\n",
> +			mpc8xxx_gc->irqn, ret);
>  		goto err;
>  	}
>=20
> @@ -425,12 +435,21 @@ static int mpc8xxx_remove(struct platform_device *p=
dev)
>  	return 0;
>  }
>=20
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id gpio_acpi_ids[] =3D {
> +	{"NXP0031",},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(acpi, gpio_acpi_ids); #endif
> +
>  static struct platform_driver mpc8xxx_plat_driver =3D {
>  	.probe		=3D mpc8xxx_probe,
>  	.remove		=3D mpc8xxx_remove,
>  	.driver		=3D {
>  		.name =3D "gpio-mpc8xxx",
>  		.of_match_table	=3D mpc8xxx_gpio_ids,
> +		.acpi_match_table =3D ACPI_PTR(gpio_acpi_ids),
>  	},
>  };
>=20
> --
> 2.25.1