Re: [PATCH 2/5] Subject: goldfish: Enable ACPI-based enumeration for goldfish framebuffer

Re: [PATCH 2/5] Subject: goldfish: Enable ACPI-based enumeration for goldfish framebuffer

[Tomi Valkeinen]

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On 26/02/16 20:41, Alan wrote:
> From: Yu Ning <yu.ning@intel.com>
> 
> Enable ACPI bindings for the Goldfish framebuffer device.
> 
> Signed-off-by: Yu Ning <yu.ning@intel.com>
> Signed-off-by: Jin Qian <jinqian@android.com>
> Signed-off-by: Alan <alan@linux.intel.com>
> ---
>  drivers/video/fbdev/goldfishfb.c |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/video/fbdev/goldfishfb.c b/drivers/video/fbdev/goldfishfb.c
> index f0e651b..58b33e4 100644
> --- a/drivers/video/fbdev/goldfishfb.c
> +++ b/drivers/video/fbdev/goldfishfb.c
> @@ -26,6 +26,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/ioport.h>
>  #include <linux/platform_device.h>
> +#include <linux/acpi.h>
>  
>  enum {
>  	FB_GET_WIDTH        = 0x00,
> @@ -310,6 +311,12 @@ static const struct of_device_id goldfish_fb_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, goldfish_fb_of_match);
>  
> +static const struct acpi_device_id goldfish_fb_acpi_match[] = {
> +	{ "GFSH0004", 0 },

I'm not familiar with ACPI, so I need to ask... Where does the ID come
from? Is it safe to use that one, and there's no chance for a clash with
some other device in the future?

> +	{ },
> +};
> +MODULE_DEVICE_TABLE(acpi, goldfish_fb_acpi_match);
> +
>  static struct platform_driver goldfish_fb_driver = {
>  	.probe		= goldfish_fb_probe,
>  	.remove		= goldfish_fb_remove,
> @@ -317,6 +324,7 @@ static struct platform_driver goldfish_fb_driver = {
>  		.name = "goldfish_fb",
>  		.owner = THIS_MODULE,
>  		.of_match_table = goldfish_fb_of_match,
> +		.acpi_match_table = ACPI_PTR(goldfish_fb_acpi_match),

So does the emulator sometimes use devicetree and sometimes ACPI to
match the device?

 Tomi


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