linux-kernel - Re: [PATCH v4] bluetooth: hci_bcm: enable IRQ capability from node

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Date:   Fri, 13 Dec 2019 12:17:02 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Guillaume La Roque <glaroque@...libre.com>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-bluetooth@...r.kernel.org, nsaenzjulienne@...e.de,
        linux-kernel@...r.kernel.org, khilman@...libre.com
Subject: Re: [PATCH v4] bluetooth: hci_bcm: enable IRQ capability from node

On Fri, Dec 13, 2019 at 11:55:21AM +0100, Guillaume La Roque wrote:
> Actually IRQ can be found from GPIO but all platforms don't support
> gpiod_to_irq, it's the case on amlogic chip.
> so to have possibility to use interrupt mode we need to add interrupts
> field in node and support it in driver.

"node" is a bit vague, please refer to devicetree here and in the patch
summary.

> Signed-off-by: Guillaume La Roque <glaroque@...libre.com>
> ---
>  drivers/bluetooth/hci_bcm.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
> index f8f5c593a05c..aa194f8d703e 100644
> --- a/drivers/bluetooth/hci_bcm.c
> +++ b/drivers/bluetooth/hci_bcm.c
> @@ -13,6 +13,7 @@
>  #include <linux/module.h>
>  #include <linux/acpi.h>
>  #include <linux/of.h>
> +#include <linux/of_irq.h>
>  #include <linux/property.h>
>  #include <linux/platform_data/x86/apple.h>
>  #include <linux/platform_device.h>
> @@ -1421,6 +1422,7 @@ static int bcm_serdev_probe(struct serdev_device *serdev)
>  #endif
>  	bcmdev->serdev_hu.serdev = serdev;
>  	serdev_device_set_drvdata(serdev, bcmdev);
> +	bcmdev->irq = of_irq_get(bcmdev->dev->of_node, 0);

And this clearly makes no sense for acpi, so you'd need to add it to
bcm_of_probe().

Shouldn't you be used using of_irq_get_byname()?

And since you're extending the binding, I think you need a preparatory
patch documenting this in:

	Documentation/devicetree/bindings/net/broadcom-bluetooth.txt

>  	/* Initialize routing field to an unused value */
>  	bcmdev->pcm_int_params[0] = 0xff;

Johan