From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Leitner Subject: [PATCH 0/2] media: v4l2-cci/ov9282: support single-read I2C transactions Date: Tue, 21 Jul 2026 15:25:27 +0200 Message-Id: <20260721-cci-single-v1-0-8485171e1393@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAEdzX2oC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDc0Nz3eTkTN3izLz0nFRdI8ukpCQLS3Nz02QTJaCGgqLUtMwKsGHRsRB +cWlSVmpyCcgEpdpaABmCERFuAAAA X-Change-ID: 20260717-cci-single-29bbb89775c4 To: Mauro Carvalho Chehab , Sakari Ailus , Dave Stevenson Cc: Laurent Pinchart , Hans de Goede , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Richard Leitner X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1784640354; l=1245; i=richard.leitner@linux.dev; s=20250225; h=from:subject:message-id; bh=svfrBm6qwvhos1KNM9Uxz3Q6w2/2dm0H31wva9nLA1w=; b=NRtTFiCF1wZG54Y77U3YMwEQO/1B2WKUYTRI06q8AtZ7FWIaYV2jD3bp3LkM5KuZDL13T6WEi oRQx9mq0My1AN0tobyFmMLiMFeW/VTApii9J4R2JfNfgKIBbetlci4L X-Developer-Key: i=richard.leitner@linux.dev; a=ed25519; pk=8hZNyyyQFqZ5ruVJsSGBSPIrmJpfDm5HwHU4QVOP1Pk= X-Endpoint-Received: by B4 Relay for richard.leitner@linux.dev/20250225 with auth_id=350 List-Id: B4 Relay Submissions This series adds support for configuring transport-specific CCI regmap behavior for I2C sensors, which is then used in the OV9282 driver to force single-register read transactions. The motivation for this change is that some OV9282 camera modules require single-read I2C transactions to operate correctly. In particular, OV9282 modules from Vision Components return invalid data on multi-byte reads, while switching the regmap to single-read transactions fixes the problem. This series does not change the default behavior of existing CCI users. Only ov9282 opts into single-read transactions. Signed-off-by: Richard Leitner --- Richard Leitner (2): media: v4l2-cci: Add support for custom regmap configuration media: ov9282: enable single-read I2C transactions drivers/media/i2c/ov9282.c | 7 ++++++- drivers/media/v4l2-core/v4l2-cci.c | 23 +++++++++++++++++++---- include/media/v4l2-cci.h | 37 ++++++++++++++++++++++++++++++++++++- 3 files changed, 61 insertions(+), 6 deletions(-) --- base-commit: 1590cf0329716306e948a8fc29f1d3ee87d3989f change-id: 20260717-cci-single-29bbb89775c4 Best regards, -- Richard Leitner