linux-kernel - Re: [PATCH 1/4] iio: accel: mc3230: add mount matrix support

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Message-ID: <20250112104849.6ee09309@jic23-huawei>
Date: Sun, 12 Jan 2025 10:48:49 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Vasiliy Doylov via B4 Relay
 <devnull+nekodevelopper.gmail.com@...nel.org>
Cc: nekodevelopper@...il.com, Lars-Peter Clausen <lars@...afoo.de>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/4] iio: accel: mc3230: add mount matrix support

On Sat, 11 Jan 2025 23:11:06 +0300
Vasiliy Doylov via B4 Relay <devnull+nekodevelopper.gmail.com@...nel.org> wrote:

> From: Vasiliy Doylov <nekodevelopper@...il.com>
> 
> This patch allows to read a mount-matrix device tree
> property and report to user-space or in-kernel iio
> clients.

Trivial, but wrap patch descriptions to 75 chars (slightly
shorter than patches because tooling tends to indent it a bit!)

Otherwise this looks good to me.

Jonathan


> 
> Signed-off-by: Vasiliy Doylov <nekodevelopper@...il.com>
> ---
>  drivers/iio/accel/mc3230.c | 28 ++++++++++++++++++++++++----
>  1 file changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/accel/mc3230.c b/drivers/iio/accel/mc3230.c
> index caa40a14a6316acae3a972f0ebe0b325db96eb44..48787c0494ae6f0ef1d4d22bc5a4608035cbe123 100644
> --- a/drivers/iio/accel/mc3230.c
> +++ b/drivers/iio/accel/mc3230.c
> @@ -44,18 +44,34 @@ static const int mc3230_nscale = 115411765;
>  	.channel2 = IIO_MOD_##axis,	\
>  	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
>  	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
> +	.ext_info = mc3230_ext_info, \
>  }
>  
> +struct mc3230_data {
> +	struct i2c_client *client;
> +	struct iio_mount_matrix orientation;
> +};
> +
> +static const struct iio_mount_matrix *
> +mc3230_get_mount_matrix(const struct iio_dev *indio_dev,
> +			const struct iio_chan_spec *chan)
> +{
> +	struct mc3230_data *data = iio_priv(indio_dev);
> +
> +	return &data->orientation;
> +}
> +
> +static const struct iio_chan_spec_ext_info mc3230_ext_info[] = {
> +	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, mc3230_get_mount_matrix),
> +	{ }
> +};
> +
>  static const struct iio_chan_spec mc3230_channels[] = {
>  	MC3230_CHANNEL(MC3230_REG_XOUT, X),
>  	MC3230_CHANNEL(MC3230_REG_YOUT, Y),
>  	MC3230_CHANNEL(MC3230_REG_ZOUT, Z),
>  };
>  
> -struct mc3230_data {
> -	struct i2c_client *client;
> -};
> -
>  static int mc3230_set_opcon(struct mc3230_data *data, int opcon)
>  {
>  	int ret;
> @@ -141,6 +157,10 @@ static int mc3230_probe(struct i2c_client *client)
>  	if (ret < 0)
>  		return ret;
>  
> +	ret = iio_read_mount_matrix(&client->dev, &data->orientation);
> +	if (ret)
> +		return ret;
> +
>  	ret = iio_device_register(indio_dev);
>  	if (ret < 0) {
>  		dev_err(&client->dev, "device_register failed\n");
>