Subject: Re: [PATCH 5/5] can: tcan4x5x: Add support for tcan4552/4553

From: Simon Horman <[email-masked]>
Date: Tue, 14 Mar 2023 17:22:02 +0100

On Tue, Mar 14, 2023 at 04:12:01PM +0100, Markus Schneider-Pargmann wrote:
> tcan4552 and tcan4553 do not have wake or state pins, so they are
> currently not compatible with the generic driver. The generic driver
> uses tcan4x5x_disable_state() and tcan4x5x_disable_wake() if the gpios
> are not defined. These functions use register bits that are not
> available in tcan4552/4553.
> 
> This patch adds support by introducing version information to reflect if
> the chip has wake and state pins. Also the version is now checked.
> 
> Signed-off-by: Markus Schneider-Pargmann

Hi Markus,

you forgot your email address in the signed-off-by line.

> ---
>  drivers/net/can/m_can/tcan4x5x-core.c | 113 ++++++++++++++++++++------
>  1 file changed, 89 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
> index fb9375fa20ec..e7fa509dacc9 100644
> --- a/drivers/net/can/m_can/tcan4x5x-core.c
> +++ b/drivers/net/can/m_can/tcan4x5x-core.c

...

> @@ -254,18 +262,53 @@ static int tcan4x5x_disable_state(struct m_can_classdev *cdev)
>  				  TCAN4X5X_DISABLE_INH_MSK, 0x01);
>  }
>  
> -static int tcan4x5x_get_gpios(struct m_can_classdev *cdev)
> +static int tcan4x5x_verify_version(
> +		struct tcan4x5x_priv *priv,
> +		const struct tcan4x5x_version_info *version_info)

nit:

static int
tcan4x5x_verify_version(struct tcan4x5x_priv *priv,                                                     const struct tcan4x5x_version_info *version_info)

or:

static int tcan4x5x_verify_version(struct tcan4x5x_priv *priv,                                                     const struct tcan4x5x_version_info *version_info)

Your could make the line shorter by renaming the 'version_info' parameter,
say to 'info'.

...

> @@ -394,21 +448,32 @@ static void tcan4x5x_can_remove(struct spi_device *spi)
>  	m_can_class_free_dev(priv->cdev.net);
>  }
>  
> +static const struct tcan4x5x_version_info tcan4x5x_generic = {
> +	.has_state_pin = true,
> +	.has_wake_pin = true,
> +};
> +
> +static const struct tcan4x5x_version_info tcan4x5x_tcan4552 = {
> +	.id2_register = 0x32353534, /* ASCII = 4552 */
> +};
> +
> +static const struct tcan4x5x_version_info tcan4x5x_tcan4553 = {
> +	.id2_register = 0x33353534, /* ASCII = 4553 */
> +};
> +
>  static const struct of_device_id tcan4x5x_of_match[] = {
> -	{
> -		.compatible = "ti,tcan4x5x",
> -	}, {
> -		/* sentinel */
> -	},
> +	{ .compatible = "ti,tcan4x5x", .data = &tcan4x5x_generic },
> +	{ .compatible = "ti,tcan4552", .data = &tcan4x5x_tcan4552 },
> +	{ .compatible = "ti,tcan4553", .data = &tcan4x5x_tcan4553 },
> +	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, tcan4x5x_of_match);
>  
>  static const struct spi_device_id tcan4x5x_id_table[] = {
> -	{
> -		.name = "tcan4x5x",
> -	}, {
> -		/* sentinel */
> -	},
> +	{ .name = "tcan4x5x", .driver_data = (unsigned long) &tcan4x5x_generic, },
> +	{ .name = "tcan4552", .driver_data = (unsigned long) &tcan4x5x_tcan4552, },
> +	{ .name = "tcan4553", .driver_data = (unsigned long) &tcan4x5x_tcan4553, },

nit: checkpatch tells me that no space is necessary after a cast.

> +	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table);
>  
> -- 
> 2.39.2
>