linux-kernel - Re: [PATCH v2 07/14] iio: accel: bma220: reset registers during init stage

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Message-ID: <a10a2f6d-6cb7-4922-b505-dc6994f0415f@kernel.org>
Date: Thu, 11 Sep 2025 09:35:52 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Petre Rodan <petre.rodan@...dimension.ro>,
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>,
 Nuno Sá <nuno.sa@...log.com>,
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/14] iio: accel: bma220: reset registers during init
 stage

On 10/09/2025 09:57, Petre Rodan wrote:
> Bring all configuration registers to default values during device probe().
> 
> Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>
> ---
>  drivers/iio/accel/bma220_core.c | 71 ++++++++++++++++++++++++++++-------------
>  1 file changed, 49 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/iio/accel/bma220_core.c b/drivers/iio/accel/bma220_core.c
> index b6f1374a9cca52966c1055113710061a7284cf5a..322df516c90a7c645eeca579cae9803eb31caad1 100644
> --- a/drivers/iio/accel/bma220_core.c
> +++ b/drivers/iio/accel/bma220_core.c
> @@ -29,12 +29,15 @@
>  #define BMA220_REG_ACCEL_Z			0x04
>  #define BMA220_REG_RANGE			0x11
>  #define BMA220_REG_SUSPEND			0x18
> +#define BMA220_REG_SOFTRESET			0x19
>  
>  #define BMA220_CHIP_ID				0xDD
>  #define BMA220_READ_MASK			BIT(7)
>  #define BMA220_RANGE_MASK			GENMASK(1, 0)
>  #define BMA220_SUSPEND_SLEEP			0xFF
>  #define BMA220_SUSPEND_WAKE			0x00
> +#define BMA220_RESET_MODE			0xFF
> +#define BMA220_NONRESET_MODE			0x00
>  
>  #define BMA220_DEVICE_NAME			"bma220"
>  
> @@ -203,31 +206,28 @@ static const struct iio_info bma220_info = {
>  	.read_avail		= bma220_read_avail,
>  };
>  
> -static int bma220_init(struct spi_device *spi)
> +static int bma220_reset(struct spi_device *spi, bool up)
>  {
> -	int ret;
> -	static const char * const regulator_names[] = { "vddd", "vddio", "vdda" };
> +	int i, ret;
>  
> -	ret = devm_regulator_bulk_get_enable(&spi->dev,


You just added this code in patch 6. Don't add code which immediately
you remove. I understand you re-add this later, so basically it is a
move, but such patch diff is still confusing.


Best regards,
Krzysztof