linux-kernel - [PATCH v2 0/2] iio: dac: adi-axi-dac: fix for wrong bus read

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Message-Id: <20250409-ad3552r-fix-bus-read-v2-0-34d3b21e8ca0@baylibre.com>
Date: Wed, 09 Apr 2025 11:16:53 +0200
From: Angelo Dureghello <adureghello@...libre.com>
To: Nuno Sa <nuno.sa@...log.com>, Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
 Andy Shevchenko <andy@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v2 0/2] iio: dac: adi-axi-dac: fix for wrong bus read

This patchset is intended to fix a random wrong chip ID read, or a
scratchpad test mismatch, tests done in the ad3552r-hs driver probe. The 
bus "read" operation must always check for busy flag before reading.

First patch reorganizes a bit the busy-wait polling code, second patch
fixes the wrong bus read occurence. 

NOTE: due to ongoing changes in adi-axi-dac.c, this patch is intended to be
applied after the linked "ramp generator" patch.

Link: https://lore.kernel.org/linux-iio/20250408-wip-bl-ad3552r-fixes-v4-0-b33c0264bd78@baylibre.com
Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
Changes in v2:
- invert patch order, fix first.
- Link to v1: https://lore.kernel.org/r/20250408-ad3552r-fix-bus-read-v1-0-37add66aeb08@baylibre.com

---
Angelo Dureghello (2):
      iio: dac: adi-axi-dac: fix bus read
      iio: dac: adi-axi-dac: use unique bus free check

 drivers/iio/dac/adi-axi-dac.c | 40 +++++++++++++++++++++++++---------------
 1 file changed, 25 insertions(+), 15 deletions(-)
---
base-commit: 6fb85f14853ddde06d57030c753168402bf69cd9
change-id: 20250408-ad3552r-fix-bus-read-1522622fbd2b

Best regards,
-- 
Angelo Dureghello <adureghello@...libre.com>