linux-kernel - Re: [PATCH 1/3] usb: gadget: udc: atmel: GPIO inversion is handled by gpiod

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Message-ID: <20180416114256.GC2750@rfolt0960.corp.atmel.com>
Date:   Mon, 16 Apr 2018 13:42:56 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Romain Izard <romain.izard.pro@...il.com>
CC:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 1/3] usb: gadget: udc: atmel: GPIO inversion is handled
 by gpiod

On Mon, Apr 16, 2018 at 11:34:03AM +0200, Romain Izard wrote:
> When converting to GPIO descriptors, gpiod_get_value automatically
> handles the line inversion flags from the device tree.

Thanks, I totally missed it.

Regards

> 
> Do not invert the line twice.
> 
> Fixes: 3df034081021fa4b6967ce3364bc7d867ec1c870
> 
> Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>

> ---
>  drivers/usb/gadget/udc/atmel_usba_udc.c | 3 +--
>  drivers/usb/gadget/udc/atmel_usba_udc.h | 1 -
>  2 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
> index 27c16399c7e8..0fe3d0feb8f7 100644
> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
> @@ -417,7 +417,7 @@ static inline void usba_int_enb_set(struct usba_udc *udc, u32 val)
>  static int vbus_is_present(struct usba_udc *udc)
>  {
>  	if (udc->vbus_pin)
> -		return gpiod_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
> +		return gpiod_get_value(udc->vbus_pin);
>  
>  	/* No Vbus detection: Assume always present */
>  	return 1;
> @@ -2076,7 +2076,6 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
>  
>  	udc->vbus_pin = devm_gpiod_get_optional(&pdev->dev, "atmel,vbus",
>  						GPIOD_IN);
> -	udc->vbus_pin_inverted = gpiod_is_active_low(udc->vbus_pin);
>  
>  	if (fifo_mode == 0) {
>  		pp = NULL;
> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.h b/drivers/usb/gadget/udc/atmel_usba_udc.h
> index 969ce8f3c3e2..d7eb7cf4fd5c 100644
> --- a/drivers/usb/gadget/udc/atmel_usba_udc.h
> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.h
> @@ -326,7 +326,6 @@ struct usba_udc {
>  	const struct usba_udc_errata *errata;
>  	int irq;
>  	struct gpio_desc *vbus_pin;
> -	int vbus_pin_inverted;
>  	int num_ep;
>  	int configured_ep;
>  	struct usba_fifo_cfg *fifo_cfg;
> -- 
> 2.14.1
>