Re: [PATCH v6 04/17] iio: adc: at91-sama5d2_adc: rework temp calibration layout handling

[Jonathan Cameron]

On Thu, 6 Aug 2026 13:10:11 +0530
Varshini Rajendran <varshini.rajendran@xxxxxxxxxxxxx> wrote:

> Extend support to handle different temperature calibration layouts.
> 
> Add a temperature calibration data layout structure to describe indexes
> of the factors P1, P4, P6, tag, minimum length of the packet and the
> scaling factors for P1 (p1_scale) which are SoC-specific instead of the
> older non scalable id structure. This helps handle the differences in the
> same function flow and prepare the calibration data to be applied.
> 
> Reviewed-by: Eugen Hristev <ehristev@xxxxxxxxxx>
> Signed-off-by: Varshini Rajendran <varshini.rajendran@xxxxxxxxxxxxx>
https://sashiko.dev/#/patchset/20260806074024.531259-1-varshini.rajendran%40microchip.com

For the unused define comment.  I 'might' tweak this is apply or go
meh i can't be bothered and apply it away :) 
Again - if you respin for another reason please tidy this up.

The other comment from Sashiko doesn't seem particularly useful to
me even if it is maybe valid.

> ---
>  drivers/iio/adc/at91-sama5d2_adc.c | 66 ++++++++++++++++++++++--------
>  1 file changed, 48 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> index 09390f082fc4..82db8f2f4db0 100644
> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> @@ -16,6 +16,7 @@
>  #include <linux/dmaengine.h>
>  #include <linux/interrupt.h>
>  #include <linux/io.h>
> +#include <linux/math.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/property.h>
> @@ -444,6 +445,27 @@ static const struct at91_adc_reg_layout sama7g5_layout = {
>  #define at91_adc_writel(st, reg, val)					\
>  	writel_relaxed(val, (st)->base + (st)->soc_info.platform->layout->reg)
>  
> +/* Temperature calibration tag "ACST" in ASCII */
> +#define AT91_TEMP_CALIB_TAG_ACST	0x41435354

Eagle eyed sashiko spotted this isn't used in this patch.  Should have been
introduced with first use in patch 5 I think.