linux-kernel - Re: [PATCH linux-can/testing] can: tcan4x5x: Disable the INH pin device-state GPIO is unavailable

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Date:   Sun, 29 Dec 2019 16:32:08 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dan Murphy <dmurphy@...com>, linux-kernel@...r.kernel.org,
        linux-can@...r.kernel.org, wg@...ndegger.com,
        sriram.dash@...sung.com
Subject: Re: [PATCH linux-can/testing] can: tcan4x5x: Disable the INH pin
 device-state GPIO is unavailable

On 12/12/19 5:15 PM, Dan Murphy wrote:
> If the device state GPIO is not connected to the host then disable the
> INH output from the TCAN device per section 8.3.5 of the data sheet.
> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---

Applied to linux-can. With some changes...

>  drivers/net/can/m_can/tcan4x5x.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
> index b5d2ea0999c1..6a1f242d1876 100644
> --- a/drivers/net/can/m_can/tcan4x5x.c
> +++ b/drivers/net/can/m_can/tcan4x5x.c
> @@ -102,6 +102,7 @@
>  #define TCAN4X5X_MODE_NORMAL BIT(7)
>  
>  #define TCAN4X5X_DISABLE_WAKE_MSK	(BIT(31) | BIT(30))
> +#define TCAN4X5X_DISABLE_INH_MSK	BIT(9)
>  
>  #define TCAN4X5X_SW_RESET BIT(2)
>  
> @@ -360,6 +361,15 @@ static int tcan4x5x_disable_wake(struct m_can_classdev *cdev)
>  				  TCAN4X5X_DISABLE_WAKE_MSK, 0x00);
>  }
>  
> +static int tcan4x5x_disable_state(struct m_can_classdev *cdev)
> +{
> +	struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
> +
> +	return regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
> +				  TCAN4X5X_DISABLE_INH_MSK, 0x01);
> +

Removed the stray line while applying.

> +}
> +
>  static int tcan4x5x_parse_config(struct m_can_classdev *cdev)
>  {
>  	struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
> @@ -383,8 +393,10 @@ static int tcan4x5x_parse_config(struct m_can_classdev *cdev)
>  	tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev,
>  							      "device-state",
>  							      GPIOD_IN);
> -	if (IS_ERR(tcan4x5x->device_state_gpio))
> +	if (IS_ERR(tcan4x5x->device_state_gpio)) {
>  		tcan4x5x->device_state_gpio = NULL;
> +		tcan4x5x_disable_state(cdev);
> +	}
For some reason, this hunk doesn't apply, due to the additional:

>> 	tcan4x5x->power = devm_regulator_get_optional(cdev->dev,
>> 						      "vsup");

I've applied the patch manually.

>  
>  	return 0;
>  }
> 

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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