linux-kernel - Re: [PATCH v3 1/9] iio: dac: ad3552r-common: fix ad3541/2r ranges

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Message-ID: <490b530b737cf2fb0be4830ae4f368569231df79.camel@gmail.com>
Date: Mon, 13 Jan 2025 15:56:07 +0000
From: Nuno Sá <noname.nuno@...il.com>
To: Angelo Dureghello <adureghello@...libre.com>, Lars-Peter Clausen
	 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron
	 <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, Nuno Sa
	 <nuno.sa@...log.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/9] iio: dac: ad3552r-common: fix ad3541/2r ranges

On Fri, 2025-01-10 at 11:24 +0100, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@...libre.com>
> 
> Fix ad3541/2r voltage ranges to be as per ad3542r datasheet,
> rev. C, table 38 (page 57).
> 
> The wrong ad354xr ranges was generating erroneous Vpp output.
> 
> In more details:
> - fix wrong number of ranges, they are 5 ranges, not 6,
> - remove non-existent 0-3V range,
> - adjust order, since ad3552r_find_range() get a wrong index,
>   producing a wrong Vpp as output.
> 
> Retested all the ranges on real hardware, EVALAD3542RFMCZ:
> 
> adi,output-range-microvolt (fdt):
> <(000000) (2500000)>;   ok (Rfbx1, switch 10)
> <(000000) (5000000)>;   ok (Rfbx1, switch 10)
> <(000000) (10000000)>;  ok (Rfbx1, switch 10)
> <(-5000000) (5000000)>; ok (Rfbx2, switch +/- 5)
> <(-2500000) (7500000)>; ok (Rfbx2, switch -2.5/7.5)
> 
> Fixes: 8f2b54824b28 ("drivers:iio:dac: Add AD3552R driver support")
> Reviewed-by: David Lechner <dlechner@...libre.com>
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---

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

>  drivers/iio/dac/ad3552r-common.c | 5 ++---
>  drivers/iio/dac/ad3552r.h        | 8 +++-----
>  2 files changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iio/dac/ad3552r-common.c b/drivers/iio/dac/ad3552r-
> common.c
> index 0f495df2e5ce..03e0864f5084 100644
> --- a/drivers/iio/dac/ad3552r-common.c
> +++ b/drivers/iio/dac/ad3552r-common.c
> @@ -22,11 +22,10 @@ EXPORT_SYMBOL_NS_GPL(ad3552r_ch_ranges, "IIO_AD3552R");
>  
>  const s32 ad3542r_ch_ranges[AD3542R_MAX_RANGES][2] = {
>  	[AD3542R_CH_OUTPUT_RANGE_0__2P5V]	= { 0, 2500 },
> -	[AD3542R_CH_OUTPUT_RANGE_0__3V]		= { 0, 3000 },
>  	[AD3542R_CH_OUTPUT_RANGE_0__5V]		= { 0, 5000 },
>  	[AD3542R_CH_OUTPUT_RANGE_0__10V]	= { 0, 10000 },
> -	[AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V]	= { -2500, 7500 },
> -	[AD3542R_CH_OUTPUT_RANGE_NEG_5__5V]	= { -5000, 5000 }
> +	[AD3542R_CH_OUTPUT_RANGE_NEG_5__5V]	= { -5000, 5000 },
> +	[AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V]	= { -2500, 7500 }
>  };
>  EXPORT_SYMBOL_NS_GPL(ad3542r_ch_ranges, "IIO_AD3552R");
>  
> diff --git a/drivers/iio/dac/ad3552r.h b/drivers/iio/dac/ad3552r.h
> index fd5a3dfd1d1c..4b5581039ae9 100644
> --- a/drivers/iio/dac/ad3552r.h
> +++ b/drivers/iio/dac/ad3552r.h
> @@ -131,7 +131,7 @@
>  #define AD3552R_CH1_ACTIVE				BIT(1)
>  
>  #define AD3552R_MAX_RANGES	5
> -#define AD3542R_MAX_RANGES	6
> +#define AD3542R_MAX_RANGES	5
>  #define AD3552R_QUAD_SPI	2
>  
>  extern const s32 ad3552r_ch_ranges[AD3552R_MAX_RANGES][2];
> @@ -189,16 +189,14 @@ enum ad3552r_ch_vref_select {
>  enum ad3542r_ch_output_range {
>  	/* Range from 0 V to 2.5 V. Requires Rfb1x connection */
>  	AD3542R_CH_OUTPUT_RANGE_0__2P5V,
> -	/* Range from 0 V to 3 V. Requires Rfb1x connection  */
> -	AD3542R_CH_OUTPUT_RANGE_0__3V,
>  	/* Range from 0 V to 5 V. Requires Rfb1x connection  */
>  	AD3542R_CH_OUTPUT_RANGE_0__5V,
>  	/* Range from 0 V to 10 V. Requires Rfb2x connection  */
>  	AD3542R_CH_OUTPUT_RANGE_0__10V,
> -	/* Range from -2.5 V to 7.5 V. Requires Rfb2x connection  */
> -	AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V,
>  	/* Range from -5 V to 5 V. Requires Rfb2x connection  */
>  	AD3542R_CH_OUTPUT_RANGE_NEG_5__5V,
> +	/* Range from -2.5 V to 7.5 V. Requires Rfb2x connection  */
> +	AD3542R_CH_OUTPUT_RANGE_NEG_2P5__7P5V,
>  };
>  
>  enum ad3552r_ch_output_range {
>