linux-kernel - Re: [PATCH can-next v5 2/2] can: tcan4x5x: add option for selecting nWKRQ voltage

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Message-ID: <clwiowhd5jwf7uzbcbexelsspdpflqhshq6ev5wsabhuugemlp@bbktuqgjd2gg>
Date: Mon, 18 Nov 2024 16:05:42 +0100
From: Sean Nyekjaer <sean@...nix.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>, 
	Vincent Mailhol <mailhol.vincent@...adoo.fr>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH can-next v5 2/2] can: tcan4x5x: add option for selecting
 nWKRQ voltage

Hi Marc,

On Thu, Nov 14, 2024 at 10:14:50AM +0100, Sean Nyekjaer wrote:
> The nWKRQ pin supports an output voltage of either the internal reference
> voltage (3.6V) or the reference voltage of
> the digital interface 0-6V (VIO).
> Add the devicetree option ti,nwkrq-voltage-vio to set it to VIO.
> 
> If this property is omitted the reset default, the internal reference
> voltage, is used.
> 
> Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> Reviewed-by: Marc Kleine-Budde <mkl@...gutronix.de>
> Reviewed-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> ---
>  drivers/net/can/m_can/tcan4x5x-core.c | 20 ++++++++++++++++++++
>  drivers/net/can/m_can/tcan4x5x.h      |  2 ++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
> index 2f73bf3abad889c222f15c39a3d43de1a1cf5fbb..7213d9894c82d079bf92f1ec62d4eebb500cdfa4 100644
> --- a/drivers/net/can/m_can/tcan4x5x-core.c
> +++ b/drivers/net/can/m_can/tcan4x5x-core.c
> @@ -92,6 +92,8 @@
>  #define TCAN4X5X_MODE_STANDBY BIT(6)
>  #define TCAN4X5X_MODE_NORMAL BIT(7)
>  
> +#define TCAN4X5X_NWKRQ_VOLTAGE_VIO BIT(19)
> +
>  #define TCAN4X5X_DISABLE_WAKE_MSK	(BIT(31) | BIT(30))
>  #define TCAN4X5X_DISABLE_INH_MSK	BIT(9)
>  
> @@ -267,6 +269,13 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
>  	if (ret)
>  		return ret;
>  
> +	if (tcan4x5x->nwkrq_voltage_vio) {
> +		ret = regmap_set_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
> +				      TCAN4X5X_NWKRQ_VOLTAGE_VIO);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	return ret;
>  }
>  
> @@ -318,6 +327,15 @@ static const struct tcan4x5x_version_info
>  	return &tcan4x5x_versions[TCAN4X5X];
>  }
>  
> +static void tcan4x5x_get_dt_data(struct m_can_classdev *cdev)
> +{
> +	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
> +	struct device_node *np = cdev->dev->of_node;

Guess we can remove this line. Sorry

> +
> +	tcan4x5x->nwkrq_voltage_vio =
> +		of_property_read_bool(cdev->dev->of_node, "ti,nwkrq-voltage-vio");
> +}
> +
>  static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,
>  			      const struct tcan4x5x_version_info *version_info)
>  {
> @@ -453,6 +471,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
>  		goto out_power;
>  	}
>  
> +	tcan4x5x_get_dt_data(mcan_class);
> +
>  	tcan4x5x_check_wake(priv);
>  
>  	ret = tcan4x5x_write_tcan_reg(mcan_class, TCAN4X5X_INT_EN, 0);
> diff --git a/drivers/net/can/m_can/tcan4x5x.h b/drivers/net/can/m_can/tcan4x5x.h
> index e62c030d3e1e5a713c997e7c8ecad4a44aff4e6a..203399d5e8ccf3fd7a26b54d8356fca9d398524c 100644
> --- a/drivers/net/can/m_can/tcan4x5x.h
> +++ b/drivers/net/can/m_can/tcan4x5x.h
> @@ -42,6 +42,8 @@ struct tcan4x5x_priv {
>  
>  	struct tcan4x5x_map_buf map_buf_rx;
>  	struct tcan4x5x_map_buf map_buf_tx;
> +
> +	bool nwkrq_voltage_vio;
>  };
>  
>  static inline void
> 
> -- 
> 2.46.2
> 

/Sean