linux-kernel - RE: [PATCH v2] gpio: mpc8xxx: Add ACPI support

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Message-ID: <AM6PR04MB54136819BA7C627BCB569C8DF1689@AM6PR04MB5413.eurprd04.prod.outlook.com>
Date:   Fri, 19 Mar 2021 07:56:35 +0000
From:   Ran Wang <ran.wang_1@....com>
To:     Michael Walle <michael@...le.cc>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] gpio: mpc8xxx: Add ACPI support

Hi Michael,

On Friday, March 19, 2021 3:52 PM, Michael Walle wrote:
> 
> Am 2021-03-19 03:53, schrieb Ran Wang:
> > 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>
> > ---
> > Change in v2:
> >  - Initialize devtype with NULL to fix compile warning.
> >  - Replace of_device_get_match_data() and acpi_match_device with
> > device_get_match_data().
> >  - Replace acpi_match_device() with simpler checking logic per Andy's
> > suggestion.
> >
> >  drivers/gpio/gpio-mpc8xxx.c | 34 +++++++++++++++++++++++-----------
> >  1 file changed, 23 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
> > index 6dfca83bcd90..646225fa3e73 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", },
> >  	{ .compatible = "fsl,qoriq-gpio",   },
> >  	{}
> >  };
> > @@ -303,8 +302,8 @@ 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 = NULL;
> > +	struct fwnode_handle *fwnode;
> >  	int ret;
> >
> >  	mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc),
> > GFP_KERNEL); @@ -315,14 +314,14 @@ 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,
> > @@ -345,6 +344,7 @@ static int mpc8xxx_probe(struct platform_device
> > *pdev)
> >
> >  	mpc8xxx_gc->direction_output = gc->direction_output;
> >
> > +	devtype = device_get_match_data(&pdev->dev);
> >  	if (!devtype)
> >  		devtype = &mpc8xxx_gpio_devtype_default;
> >
> > @@ -369,9 +369,9 @@ 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.
> >  	 */
> > +	fwnode = 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"))
> 
> Again, please keep this. The DT bindings don't mention "fsl,qoriq-gpio"
> is required. Alternatively, change the binding (ideally convert it to
> YAML) and get an ack by Rob.

OK, I will keep this in next version

Regards,
Ran

> -michael