linux-kernel - Re: [PATCH 2/2] extcon: add optional debounce-timeout-ms attribute

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Date:   Tue, 17 Oct 2017 08:20:04 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 2/2] extcon: add optional debounce-timeout-ms attribute

Hi,

On 2017년 10월 16일 16:34, Raveendra Padasalagi wrote:
> Add changes to capture optional dt attribute "debounce-timeout-ms"
> provided in extcon node and used the same value if provided otherwise
> default value of 20ms is used for id and vbus gpios debounce time.
> 
> Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
> Reviewed-by: Ray Jui <ray.jui@...adcom.com>
> Reviewed-by: Srinath Mannam <srinath.mannam@...adcom.com>
> ---
>  drivers/extcon/extcon-usb-gpio.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
> index 9c925b0..090f65f 100644
> --- a/drivers/extcon/extcon-usb-gpio.c
> +++ b/drivers/extcon/extcon-usb-gpio.c
> @@ -41,6 +41,7 @@ struct usb_extcon_info {
>  
>  	unsigned long debounce_jiffies;
>  	struct delayed_work wq_detcable;
> +	unsigned int gpio_debounce_timeout_ms;

You better to use the "debounce_usecs" name
because the unit of debounce time is usec.

>  };
>  
>  static const unsigned int usb_extcon_cable[] = {
> @@ -133,6 +134,11 @@ static int usb_extcon_probe(struct platform_device *pdev)
>  	if (IS_ERR(info->vbus_gpiod))
>  		return PTR_ERR(info->vbus_gpiod);
>  
> +	ret = of_property_read_u32(np, "debounce-timeout-ms",
> +			     &info->gpio_debounce_timeout_ms);

I prefer to use the 'input-debounce' property name
Because the pinctrl-bindings.txt[1] gives the guide
for the generic name of debounce.
[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
- "debounce-timeout-ms" -> "input-debounce"

> +	if (ret)
> +		info->gpio_debounce_timeout_ms = USB_GPIO_DEBOUNCE_MS;
> +
>  	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
>  	if (IS_ERR(info->edev)) {
>  		dev_err(dev, "failed to allocate extcon device\n");
> @@ -147,13 +153,14 @@ static int usb_extcon_probe(struct platform_device *pdev)
>  
>  	if (info->id_gpiod)
>  		ret = gpiod_set_debounce(info->id_gpiod,
> -					 USB_GPIO_DEBOUNCE_MS * 1000);
> +					 info->gpio_debounce_timeout_ms * 1000);
>  	if (!ret && info->vbus_gpiod)
>  		ret = gpiod_set_debounce(info->vbus_gpiod,
> -					 USB_GPIO_DEBOUNCE_MS * 1000);
> +					 info->gpio_debounce_timeout_ms * 1000);
>  
>  	if (ret < 0)
> -		info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);
> +		info->debounce_jiffies = msecs_to_jiffies(
> +						info->gpio_debounce_timeout_ms);
>  
>  	INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);
>  
> 

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics