linux-kernel - Re: [PATCH RFC v2 3/8] spi: add support for hardware triggered offload

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Message-ID: <20240511175108.5ce34c9c@jic23-huawei>
Date: Sat, 11 May 2024 17:51:08 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Nuno Sá <nuno.sa@...log.com>, Michael
 Hennerich <Michael.Hennerich@...log.com>, Lars-Peter Clausen
 <lars@...afoo.de>, David Jander <david@...tonic.nl>, Martin Sperl
 <kernel@...tin.sperl.org>, linux-spi@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-iio@...r.kernel.org
Subject: Re: [PATCH RFC v2 3/8] spi: add support for hardware triggered
 offload


Drive by comment inline.

> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> index a8fc16c6bf37..ec8d875d31ff 100644
> --- a/include/linux/spi/spi.h
> +++ b/include/linux/spi/spi.h
> @@ -632,6 +632,9 @@ struct spi_controller {
>  	/* Flag indicating that the SPI bus is locked for exclusive use */
>  	bool			bus_lock_flag;
>  
> +	/* Flag indicating the bus is reserved for use by hardware trigger */
> +	bool			offload_hw_trigger_enabled;
> +
>  	/*
>  	 * Setup mode and clock, etc (SPI driver may call many times).
>  	 *
> @@ -1594,12 +1597,26 @@ struct spi_controller_offload_ops {
>  	 * @unprepare: Callback to release any resources used by prepare().
>  	 */
>  	void (*unprepare)(struct spi_device *spi, unsigned int id);
> +
> +	/**
> +	 * @hw_trigger_enable: Callback to enable the hardware trigger for the
> +	 * given offload instance.
> +	 */
> +
Blank line in odd place..

> +	int (*hw_trigger_enable)(struct spi_device *spi, unsigned int id);
> +	/**
> +	 * @hw_trigger_disable: Callback to disable the hardware trigger for the
> +	 * given offload instance.
> +	 */
> +	void (*hw_trigger_disable)(struct spi_device *spi, unsigned int id);
>  };
>  
>  extern int spi_offload_prepare(struct spi_device *spi, unsigned int id,
>  			       struct spi_message *msg);
>  extern void spi_offload_unprepare(struct spi_device *spi, unsigned int id,
>  				  struct spi_message *msg);
> +extern int spi_offload_hw_trigger_enable(struct spi_device *spi, unsigned int id);
> +extern void spi_offload_hw_trigger_disable(struct spi_device *spi, unsigned int id);
>  
>  /*---------------------------------------------------------------------------*/
>  
>