Re: [PATCH v2 1/5] input/serio/i8042: Attach fwnode to serio i8042 kbd device

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: dtor@google.com, Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Enrico Weigelt <info@metux.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Allison Randal <allison@lohutok.net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Stephen Boyd <swboyd@chromium.org>,
	linux-input@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, furquan@google.com,
	dlaurie@google.com, bleung@google.com, zentaro@google.com,
	dbehr@google.com, rajatxjain@gmail.com,
	Rajat Jain <rajatja@google.com>
Subject: Re: [PATCH v2 1/5] input/serio/i8042: Attach fwnode to serio i8042 kbd device
Date: Thu, 26 Mar 2020 14:25:05 -0700	[thread overview]
Message-ID: <20200326212505.GI75430@dtor-ws> (raw)
In-Reply-To: <20200324123518.239768-1-rajatja@google.com>

On Tue, Mar 24, 2020 at 05:35:14AM -0700, Rajat Jain wrote:
> Attach the firmware node to the serio i8042 kbd device so that device
> properties can be passed from the firmware.
> 
> Signed-off-by: Rajat Jain <rajatja@google.com>
> ---
> v2: Remove the Change-Id from the commit log
> 
>  drivers/input/serio/i8042-x86ia64io.h | 1 +
>  drivers/input/serio/i8042.c           | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
> index dc974c288e880..ed9ec4310d976 100644
> --- a/drivers/input/serio/i8042-x86ia64io.h
> +++ b/drivers/input/serio/i8042-x86ia64io.h
> @@ -927,6 +927,7 @@ static int i8042_pnp_kbd_probe(struct pnp_dev *dev, const struct pnp_device_id *
>  	}
>  	i8042_pnp_id_to_string(dev->id, i8042_kbd_firmware_id,
>  			       sizeof(i8042_kbd_firmware_id));
> +	i8042_kbd_fwnode = dev_fwnode(&dev->dev);
>  
>  	/* Keyboard ports are always supposed to be wakeup-enabled */
>  	device_set_wakeup_enable(&dev->dev, true);
> diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
> index 20ff2bed3917a..0dddf273afd94 100644
> --- a/drivers/input/serio/i8042.c
> +++ b/drivers/input/serio/i8042.c
> @@ -21,6 +21,7 @@
>  #include <linux/i8042.h>
>  #include <linux/slab.h>
>  #include <linux/suspend.h>
> +#include <linux/property.h>
>  
>  #include <asm/io.h>
>  
> @@ -124,6 +125,7 @@ MODULE_PARM_DESC(unmask_kbd_data, "Unconditional enable (may reveal sensitive da
>  static bool i8042_bypass_aux_irq_test;
>  static char i8042_kbd_firmware_id[128];
>  static char i8042_aux_firmware_id[128];
> +static struct fwnode_handle *i8042_kbd_fwnode;
>  
>  #include "i8042.h"
>  
> @@ -1335,6 +1337,7 @@ static int __init i8042_create_kbd_port(void)
>  	strlcpy(serio->phys, I8042_KBD_PHYS_DESC, sizeof(serio->phys));
>  	strlcpy(serio->firmware_id, i8042_kbd_firmware_id,
>  		sizeof(serio->firmware_id));
> +	set_primary_fwnode(&serio->dev, i8042_kbd_fwnode);

Rafael, do you have any concerns here? We want to be able to access
properties assigned to KBC or similar device in ACPI. Serio port devices
in i8042 essentially mirror the 2 PNP (typically called KBC, PS2K or
PS2M) devices in ACPI.

Thanks.

-- 
Dmitry