linux-kernel - Re: [PATCH v3 05/10] iio: backend: extend features

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Message-ID: <60610fe3e5885033c0a1d14db6e2f576367a2e44.camel@gmail.com>
Date: Fri, 20 Sep 2024 14:50:52 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: Angelo Dureghello <adureghello@...libre.com>, Lars-Peter Clausen
 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, Nuno
 Sa <nuno.sa@...log.com>, Jonathan Cameron <jic23@...nel.org>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Olivier Moysan <olivier.moysan@...s.st.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, dlechner@...libre.com
Subject: Re: [PATCH v3 05/10] iio: backend: extend features

On Thu, 2024-09-19 at 11:20 +0200, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
> 
> Extend backend features with new calls needed later on this
> patchset from axi version of ad3552r.
> 
> The follwoing calls are added:
> 
> iio_backend_ext_sync_enable
> 	enable synchronize channels on external trigger
> iio_backend_ext_sync_disable
> 	disable synchronize channels on external trigger
> iio_backend_ddr_enable
> 	enable ddr bus transfer
> iio_backend_ddr_disable
> 	disable ddr bus transfer
> iio_backend_set_bus_mode
> 	select the type of bus, so that specific read / write
> 	operations are performed accordingly
> iio_backend_buffer_enable
> 	enable buffer
> iio_backend_buffer_disable
> 	disable buffer
> iio_backend_data_transfer_addr
> 	define the target register address where the DAC sample
> 	will be written.
> 
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---
>  drivers/iio/industrialio-backend.c | 111 +++++++++++++++++++++++++++++++++++++
>  include/linux/iio/backend.h        |  23 ++++++++
>  2 files changed, 134 insertions(+)
> 
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-
> backend.c
> index 20b3b5212da7..f4802c422dbf 100644
> --- a/drivers/iio/industrialio-backend.c
> +++ b/drivers/iio/industrialio-backend.c
> @@ -718,6 +718,117 @@ static int __devm_iio_backend_get(struct device *dev, struct
> iio_backend *back)
>  	return 0;
>  }
>  
> +/**
> + * iio_backend_ext_sync_enable - Enable external synchronization
> + * @back: Backend device
> + *
> + * Enable synchronization by external signal.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ext_sync_enable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, ext_sync_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ext_sync_enable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_ext_sync_disable - Disable external synchronization
> + * @back: Backend device
> + *
> + * Disable synchronization by external signal.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ext_sync_disable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, ext_sync_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ext_sync_disable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
> + * @back: Backend device
> + *
> + * Enabling DDR, data is generated by the IP at each front
> + * (raising and falling) of the bus clock signal.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ddr_enable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, ddr_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_enable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_ddr_disable - Disable interface DDR (Double Data Rate) mode
> + * @back: Backend device
> + *
> + * Disabling DDR data is generated byt the IP at rising or falling front
> + * of the interface clock signal (SDR, Single Data Rate).
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ddr_disable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, ddr_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_disable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_buffer_enable - Enable iio buffering
> + * @back: Backend device
> + *
> + * Enabling the buffer, buffer data is processed and sent out from the
> + * bus interface.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_buffer_enable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, buffer_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_buffer_enable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_buffer_disable - Disable iio buffering
> + * @back: Backend device
> + *
> + * Disabling the buffer, buffer data transfer on the bus interface
> + * is stopped.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_buffer_disable(struct iio_backend *back)
> +{
> +	return iio_backend_op_call(back, buffer_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_buffer_disable, IIO_BACKEND);
> +

IIRC, both me and Jonathan had some comments about the above 2 calls? Aren't they
about buffering? I think I mentioned something about using the same buffer ops as
typical IIO devices use.

- Nuno Sá