linux-kernel - Re: [PATCH v4 2/6] iio: imu: adis: Add reset to custom ops

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Message-ID: <20250112153536.0d6034a9@jic23-huawei>
Date: Sun, 12 Jan 2025 15:35:36 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Robert Budai <robert.budai@...log.com>
Cc: Nuno Sa <nuno.sa@...log.com>, Ramona Gradinariu
 <ramona.gradinariu@...log.com>, Antoniu Miclaus
 <antoniu.miclaus@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, Michael
 Hennerich <Michael.Hennerich@...log.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>, Alex Lanzano
 <lanzano.alex@...il.com>, <linux-iio@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v4 2/6] iio: imu: adis: Add reset to custom ops

On Fri, 10 Jan 2025 09:42:50 +0200
Robert Budai <robert.budai@...log.com> wrote:

> This patch allows the custom definition of reset functionality
> for adis object. It is useful in cases where the driver does not
> need to sleep after the reset since it is handled by the library.
> 
> Co-developed-by: Ramona Gradinariu <ramona.gradinariu@...log.com>
> Signed-off-by: Ramona Gradinariu <ramona.gradinariu@...log.com>
> Co-developed-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> Signed-off-by: Nuno Sá <nuno.sa@...log.com>
> Signed-off-by: Robert Budai <robert.budai@...log.com>
> ---
>  drivers/iio/imu/adis.c       | 7 ++++---
>  include/linux/iio/imu/adis.h | 3 +++
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
> index 54915c7a3e76..9e4113473dc4 100644
> --- a/drivers/iio/imu/adis.c
> +++ b/drivers/iio/imu/adis.c
> @@ -340,7 +340,7 @@ int __adis_reset(struct adis *adis)
>  	const struct adis_timeout *timeouts = adis->data->timeouts;
>  
>  	ret = __adis_write_reg_8(adis, adis->data->glob_cmd_reg,
> -				 ADIS_GLOB_CMD_SW_RESET);
> +					 ADIS_GLOB_CMD_SW_RESET);

Accidental change I guess, but bad anyway. Original looks better aligned.

>  	if (ret) {
>  		dev_err(&adis->spi->dev, "Failed to reset device: %d\n", ret);
>  		return ret;
> @@ -491,6 +491,7 @@ EXPORT_SYMBOL_NS_GPL(adis_single_conversion, "IIO_ADISLIB");
>  static const struct adis_ops adis_default_ops = {
>  	.read = __adis_read_reg,
>  	.write = __adis_write_reg,
> +	.reset = __adis_reset,
>  };
>  
>  /**
> @@ -522,9 +523,9 @@ int adis_init(struct adis *adis, struct iio_dev *indio_dev,
>  
>  	adis->spi = spi;
>  	adis->data = data;
> -	if (!adis->ops->write && !adis->ops->read)
> +	if (!adis->ops->write && !adis->ops->read && !adis->ops->reset)
>  		adis->ops = &adis_default_ops;
> -	else if (!adis->ops->write || !adis->ops->read)
> +	else if (!adis->ops->write || !adis->ops->read || !adis->ops->reset)
>  		return -EINVAL;
>  
>  	iio_device_set_drvdata(indio_dev, adis);
> diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
> index 89cfa75ae9ea..52652f51db2e 100644
> --- a/include/linux/iio/imu/adis.h
> +++ b/include/linux/iio/imu/adis.h
> @@ -98,12 +98,15 @@ struct adis_data {
>   * struct adis_ops: Custom ops for adis devices.
>   * @write: Custom spi write implementation.
>   * @read: Custom spi read implementation.
> + * @reset: Custom sw reset implementation. The custom implementation does not
> + *	   need to sleep after the reset. It's done by the library already.
>   */
>  struct adis_ops {
>  	int (*write)(struct adis *adis, unsigned int reg, unsigned int value,
>  		     unsigned int size);
>  	int (*read)(struct adis *adis, unsigned int reg, unsigned int *value,
>  		    unsigned int size);
> +	int (*reset)(struct adis *adis);
>  };
>  
>  /**