linux-kernel - Re: [PATCH 4/4] iio: dac: ad3552r-hs: add support for internal ramp

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Message-ID: <Z-R3E23hWiUKDc6q@debian-BULLSEYE-live-builder-AMD64>
Date: Wed, 26 Mar 2025 18:52:19 -0300
From: Marcelo Schmitt <marcelo.schmitt1@...il.com>
To: Angelo Dureghello <adureghello@...libre.com>
Cc: Nuno Sá <nuno.sa@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Corbet <corbet@....net>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	linux-iio@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] iio: dac: ad3552r-hs: add support for internal ramp

Hello Angelo,

Patch looks good to me.
One minor comment bellow.

On 03/21, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
> 
> The ad3552r can be feeded from the HDL controller by an internally
> generated 16bit ramp, useful for debug pourposes. Add debugfs a file
> to enable or disable it.
> 
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---
>  drivers/iio/dac/ad3552r-hs.c | 106 ++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 100 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c
> index 37397e188f225a8099745ec03f7c604da76960b1..41fe78d982a68980db059b095fc27b37ea1a461b 100644
> --- a/drivers/iio/dac/ad3552r-hs.c
> +++ b/drivers/iio/dac/ad3552r-hs.c
> @@ -7,6 +7,7 @@
...
> +
> +static ssize_t ad3552r_hs_write_data_source(struct file *f,
> +					    const char __user *userbuf,
> +					    size_t count, loff_t *ppos)
> +{
> +	struct ad3552r_hs_state *st = file_inode(f)->i_private;
> +	char buf[64];
> +	int ret;
> +
> +	ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf,
> +				     count);
> +	if (ret < 0)
> +		return ret;
> +
> +	buf[count] = 0;
Shouldn't it be
	buf[count] = '\0';
?