linux-kernel - Re: [PATCH v5 5/5] iio: amplifiers: hmc425a: add support for LTC6373 Instrumentation Amplifier

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Date: Wed, 21 Feb 2024 14:23:51 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: Dumitru Ceclan <mitrutzceclan@...il.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron
 <jic23@...nel.org>,  Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ceclan Dumitru <dumitru.ceclan@...log.com>
Subject: Re: [PATCH v5 5/5] iio: amplifiers: hmc425a: add support for
 LTC6373 Instrumentation Amplifier

On Tue, 2024-02-20 at 17:34 +0200, Dumitru Ceclan wrote:
> This adds support for LTC6373 36 V Fully-Differential Programmable-Gain
> Instrumentation Amplifier with 25 pA Input Bias Current.
> The user can program the gain to one of seven available settings through
> a 3-bit parallel interface (A2 to A0).
> 
> Signed-off-by: Dumitru Ceclan <mitrutzceclan@...il.com>
> ---

Just one minor comment. With that:

Reviewed-by: Nuno Sa <nuno.sa@...log.com>

>  drivers/iio/amplifiers/hmc425a.c | 124 ++++++++++++++++++++++++++++++-
>  1 file changed, 120 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/amplifiers/hmc425a.c b/drivers/iio/amplifiers/hmc425a.c
> index 77872e2dfdfe..50c86c2d28d7 100644
> --- a/drivers/iio/amplifiers/hmc425a.c
> +++ b/drivers/iio/amplifiers/hmc425a.c
> @@ -2,9 +2,10 @@
>  /*
>   * HMC425A and similar Gain Amplifiers
>   *
> - * Copyright 2020 Analog Devices Inc.
> + * Copyright 2020, 2024 Analog Devices Inc.
>   */

..

> 
>  
> +static ssize_t ltc6373_read_powerdown(struct iio_dev *indio_dev,
> +				      uintptr_t private,
> +				      const struct iio_chan_spec *chan,
> +				      char *buf)
> +{
> +	struct hmc425a_state *st = iio_priv(indio_dev);
> +
> +	return sysfs_emit(buf, "%d\n", st->powerdown);

Well, in theory the read should also be protected with the lock...

- Nuno Sá