linux-kernel - Re: [PATCH v4 1/9] spi: Make spi_alloc_device and spi_add

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Message-ID: <d77c27ac-6721-1d3e-2d79-4e4dfae7cabe@redhat.com>
Date:   Thu, 20 Jan 2022 15:39:28 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Stefan Binding <sbinding@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Mark Gross <markgross@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-acpi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH v4 1/9] spi: Make spi_alloc_device and spi_add_device
 public again

Hi,

On 1/20/22 14:43, Stefan Binding wrote:
> This functions were previously made private since they
> were not used. However, these functions will be needed
> again.
> 
> Partial revert of commit da21fde0fdb3
> ("spi: Make several public functions private to spi.c")
> 
> Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
>  drivers/spi/spi.c       |  6 ++++--
>  include/linux/spi/spi.h | 12 ++++++++++++
>  2 files changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 4599b121d744..1eb84101c4ad 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -532,7 +532,7 @@ static DEFINE_MUTEX(board_lock);
>   *
>   * Return: a pointer to the new device, or NULL.
>   */
> -static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
> +struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
>  {
>  	struct spi_device	*spi;
>  
> @@ -557,6 +557,7 @@ static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
>  	device_initialize(&spi->dev);
>  	return spi;
>  }
> +EXPORT_SYMBOL_GPL(spi_alloc_device);
>  
>  static void spi_dev_set_name(struct spi_device *spi)
>  {
> @@ -652,7 +653,7 @@ static int __spi_add_device(struct spi_device *spi)
>   *
>   * Return: 0 on success; negative errno on failure
>   */
> -static int spi_add_device(struct spi_device *spi)
> +int spi_add_device(struct spi_device *spi)
>  {
>  	struct spi_controller *ctlr = spi->controller;
>  	struct device *dev = ctlr->dev.parent;
> @@ -673,6 +674,7 @@ static int spi_add_device(struct spi_device *spi)
>  	mutex_unlock(&ctlr->add_lock);
>  	return status;
>  }
> +EXPORT_SYMBOL_GPL(spi_add_device);
>  
>  static int spi_add_device_locked(struct spi_device *spi)
>  {
> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> index 7ab3fed7b804..0346a3ff27fd 100644
> --- a/include/linux/spi/spi.h
> +++ b/include/linux/spi/spi.h
> @@ -1452,7 +1452,19 @@ spi_register_board_info(struct spi_board_info const *info, unsigned n)
>   * use spi_new_device() to describe each device.  You can also call
>   * spi_unregister_device() to start making that device vanish, but
>   * normally that would be handled by spi_unregister_controller().
> + *
> + * You can also use spi_alloc_device() and spi_add_device() to use a two
> + * stage registration sequence for each spi_device. This gives the caller
> + * some more control over the spi_device structure before it is registered,
> + * but requires that caller to initialize fields that would otherwise
> + * be defined using the board info.
>   */
> +extern struct spi_device *
> +spi_alloc_device(struct spi_controller *ctlr);
> +
> +extern int
> +spi_add_device(struct spi_device *spi);
> +
>  extern struct spi_device *
>  spi_new_device(struct spi_controller *, struct spi_board_info *);
>  
>