linux-kernel - Re: [PATCH 04/16] iio: adc: max1027: Lower conversion time

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Message-ID: <20210830111026.2952addf@jic23-huawei>
Date:   Mon, 30 Aug 2021 11:10:26 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-iio@...r.kernel.org, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/16] iio: adc: max1027: Lower conversion time

On Wed, 18 Aug 2021 13:11:27 +0200
Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> When only a few channels are requested, the core will request all of
> them as long as ->available_scan_masks is present, thus reducing the
> impact of any driver side optimization to avoid converting the unneeded
> channels.
> 
> Do not share this bitmap with the core, which is optional anyway.

As mentioned in previous patch - do share it with the core, but update
it to include the masks you now support.

As a side note, you should have done this in previous patch anyway
given that patch is effectively a noop with out it. (assuming it was
a good thing to do at all which I'm not sure it is!)

Jonathan

> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  drivers/iio/adc/max1027.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
> index 8ab660f596b5..d79dabf20567 100644
> --- a/drivers/iio/adc/max1027.c
> +++ b/drivers/iio/adc/max1027.c
> @@ -457,7 +457,6 @@ static int max1027_probe(struct spi_device *spi)
>  	indio_dev->modes = INDIO_DIRECT_MODE;
>  	indio_dev->channels = st->info->channels;
>  	indio_dev->num_channels = st->info->num_channels;
> -	indio_dev->available_scan_masks = st->info->available_scan_masks;
>  
>  	st->buffer = devm_kmalloc_array(&indio_dev->dev,
>  				  indio_dev->num_channels, 2,