linux-kernel - [PATCH v2 0/2] Keep imx93 ADC works even calibration failed.

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Message-Id: <20250812-adc-v2-0-0260833f13b8@nxp.com>
Date: Tue, 12 Aug 2025 16:04:21 +0800
From: Haibo Chen <haibo.chen@....com>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, primoz.fiser@...ik.com
Cc: linux-iio@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Haibo Chen <haibo.chen@....com>
Subject: [PATCH v2 0/2] Keep imx93 ADC works even calibration failed.

imx93 ADC calibration has requirement for reference voltage:
  ADC reference voltage Noise < 1.8V * 1/2^ENOB

Some boards can't meet such requirement, ADC calibration failed on these
boards, and adc can't be used. This is not appropriate, board can't meet
this requirement do not means ADC can't work, just means ADC can't work
that accurate. Here add an optimization, keep adc works even calibration
failed.

Changes in V2:
- add patch 1 to keep one style of the hex values according to
  Andy Shevchenko's suggestion.
- keep {} when give the calibration failed warning log.

For the register 0x3A0, it is a new added register in latest imx93 RM,
please refer to this link:
https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-9-processors/i-mx-93-applications-processor-family-arm-cortex-a55-ml-acceleration-power-efficient-mpu:i.MX93

Patch v1 also pass test on one customer board, refer to this topic:
https://patchwork.kernel.org/project/linux-iio/patch/20250710073905.1105417-2-primoz.fiser@norik.com/

Signed-off-by: Haibo Chen <haibo.chen@....com>
---
Haibo Chen (2):
      iio: adc: imx93_adc: keep one style of the hex values
      iio: adc: imx93_adc: load calibrated values even calibration failed

 drivers/iio/adc/imx93_adc.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)
---
base-commit: 2674d1eadaa2fd3a918dfcdb6d0bb49efe8a8bb9
change-id: 20250812-adc-839e49d55da9

Best regards,
-- 
Haibo Chen <haibo.chen@....com>