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Date: Tue, 21 May 2024 18:47:22 +0300
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Devyn Liu <liudingyuan@huawei.com>, linus.walleij@linaro.org,
	brgl@bgdev.pl, f.fangjian@huawei.com, linux-gpio@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
	jonathan.cameron@huawei.com, yangyicong@huawei.com,
	yisen.zhuang@huawei.com, kong.kongxinwei@hisilicon.com
Subject: Re: [PATCH] gpiolib: acpi: Fix failed in acpi_gpiochip_find() by
 adding parent node match
Message-ID: <ZkzCCkOx8AtjPWSE@smile.fi.intel.com>
References: <20240513075901.2030293-1-liudingyuan@huawei.com>
 <20240520043749.GH1421138@black.fi.intel.com>
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In-Reply-To: <20240520043749.GH1421138@black.fi.intel.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo

On Mon, May 20, 2024 at 07:37:49AM +0300, Mika Westerberg wrote:
> On Mon, May 13, 2024 at 03:59:01PM +0800, Devyn Liu wrote:
> > Previous patch modified the standard used by acpi_gpiochip_find()
> > to match device nodes. Using the device node set in gc->gpiodev->d-
> > ev instead of gc->parent.
> > 
> > However, there is a situation in gpio-dwapb where the GPIO device
> > driver will set gc->fwnode for each port corresponding to a child
> > node under a GPIO device, so gc->gpiodev->dev will be assigned the
> > value of each child node in gpiochip_add_data().
> > 
> > gpio-dwapb.c:
> > 128,31 static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
> > 			       struct dwapb_port_property *pp,
> > 			       unsigned int offs);
> > port->gc.fwnode = pp->fwnode;
> > 
> > 693,39 static int dwapb_gpio_probe;
> > err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
> > 
> > When other drivers request GPIO pin resources through the GPIO device
> > node provided by ACPI (corresponding to the parent node), the change
> > of the matching object to gc->gpiodev->dev in acpi_gpiochip_find()
> > only allows finding the value of each port (child node), resulting
> > in a failed request.
> > 
> > Reapply the condition of using gc->parent for match in acpi_gpio-
> > chip_find() in the code can compatible with the problem of gpio-dwapb,
> > and will not affect the two cases mentioned in the patch:
> > 1. There is no setting for gc->fwnode.
> > 2. The case that depends on using gc->fwnode for match.
> > 
> > Fixes: 5062e4c14b75 ("gpiolib: acpi: use the fwnode in acpi_gpiochip_find()")
> > Fixes: 067dbc1ea5ce ("gpiolib: acpi: Don't use GPIO chip fwnode in acpi_gpiochip_find()")
> > Signed-off-by: Devyn Liu <liudingyuan@huawei.com>
> 
> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Pushed to my review and testing queue, thanks!

-- 
With Best Regards,
Andy Shevchenko