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Fri, 8 Jan 2021 04:52:22 -0500 (EST) Date: Fri, 8 Jan 2021 10:52:21 +0100 From: Maxime Ripard To: Paul Kocialkowski Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, devel@driverdev.osuosl.org, linux-sunxi@googlegroups.com, Yong Deng , Mauro Carvalho Chehab , Rob Herring , Chen-Yu Tsai , Jernej Skrabec , Jonathan Corbet , Kishon Vijay Abraham I , Vinod Koul , Helen Koike , Dafna Hirschfeld , Greg Kroah-Hartman , Philipp Zabel , Sakari Ailus , Hans Verkuil , Thomas Petazzoni , kevin.lhopital@hotmail.com Subject: Re: [PATCH v4 07/15] media: sun6i-csi: Add support for MIPI CSI-2 bridge input Message-ID: <20210108095221.squax52u2knxxgoy@gilmour> References: <20201231142948.3241780-1-paul.kocialkowski@bootlin.com> <20201231142948.3241780-8-paul.kocialkowski@bootlin.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="sapnhbeyia6qq3l7" Content-Disposition: inline In-Reply-To: <20201231142948.3241780-8-paul.kocialkowski@bootlin.com> Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org --sapnhbeyia6qq3l7 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Dec 31, 2020 at 03:29:40PM +0100, Paul Kocialkowski wrote: > The A31 CSI controller supports a MIPI CSI-2 bridge input, which has > its own dedicated port in the fwnode graph. >=20 > Support for this input is added with this change: > - two pads are defined for the media entity instead of one > and only one needs to be connected at a time; > - the pads currently match the fwnode graph representation; > - links are created between our pads and the subdevs for each > interface and are no longer immutable so that userspace can select > which interface to use in case both are bound to a subdev; > - fwnode endpoints are parsed and stored for each interface; > - the active subdev (and fwnode endpoint) is retrieved when validating > the media link at stream on time and cleared at stream off; > - an error is raised if both links are active at the same time; > - the MIPI interface bit is set if the MIPI CSI-2 bridge endpoint is > active. >=20 > In the future, the media entity representation might evolve to: > - distinguish the internal parallel bridge and data formatter; > - represent each of the 4 internal channels that can exist between > the parallel bridge (for BT656 time-multiplex) and MIPI CSI-2 > (internal channels can be mapped to virtual channels); > - connect the controller's output to the ISP instead of its > DMA engine. >=20 > Finally note that the MIPI CSI-2 bridges should not be linked in > the fwnode graph unless they have a sensor subdev attached. >=20 > Signed-off-by: Paul Kocialkowski Acked-by: Maxime Ripard Maxime --sapnhbeyia6qq3l7 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCX/grTwAKCRDj7w1vZxhR xaWoAQDnF8B2JCSct0BxYeQua9xd5yH22K8Et3Stf1Z7l8QlcQD8C2QDOCFM5k6d 9v4VMq95E2L9I/j04U1xefNZHfVdkw8= =yq67 -----END PGP SIGNATURE----- --sapnhbeyia6qq3l7--