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[86.13.91.161]) by smtp.gmail.com with ESMTPSA id 11sm11993663wrb.30.2022.01.30.15.59.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 30 Jan 2022 15:59:08 -0800 (PST) From: Daniel Scally To: linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org Cc: sakari.ailus@linux.intel.com, laurent.pinchart@ideasonboard.com, hanlinchen@chromium.org, tfiga@chromium.org, hdegoede@redhat.com, kieran.bingham@ideasonboard.com, hpa@redhat.com Subject: [PATCH v2 3/6] media: docs: Add entries documenting ancillary links Date: Sun, 30 Jan 2022 23:58:18 +0000 Message-Id: <20220130235821.48076-4-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220130235821.48076-1-djrscally@gmail.com> References: <20220130235821.48076-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add some elements to the uAPI documentation to explain the new link type, their purpose and some aspects of their current implementation. Signed-off-by: Daniel Scally --- Changes since v1: - New patch .../media/mediactl/media-controller-model.rst | 6 ++++++ .../userspace-api/media/mediactl/media-types.rst | 9 ++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/Documentation/userspace-api/media/mediactl/media-controller-model.rst b/Documentation/userspace-api/media/mediactl/media-controller-model.rst index 222cb99debb5..f77cb9d952e5 100644 --- a/Documentation/userspace-api/media/mediactl/media-controller-model.rst +++ b/Documentation/userspace-api/media/mediactl/media-controller-model.rst @@ -33,3 +33,9 @@ are: - An **interface link** is a point-to-point bidirectional control connection between a Linux Kernel interface and an entity. + +- An **ancillary link** is a point-to-point connection describing a physical + relationship between two entities. For example this could represent the + fact that a particular camera sensor and lens controller form a single + physical module, meaning this lens controller drives the lens for this + camera sensor. \ No newline at end of file diff --git a/Documentation/userspace-api/media/mediactl/media-types.rst b/Documentation/userspace-api/media/mediactl/media-types.rst index 0a26397bd01d..d69bae359e5b 100644 --- a/Documentation/userspace-api/media/mediactl/media-types.rst +++ b/Documentation/userspace-api/media/mediactl/media-types.rst @@ -413,7 +413,7 @@ must be set for every pad. * - ``MEDIA_LNK_FL_LINK_TYPE`` - This is a bitmask that defines the type of the link. Currently, - two types of links are supported: + three types of links are supported: .. _MEDIA-LNK-FL-DATA-LINK: @@ -423,3 +423,10 @@ must be set for every pad. ``MEDIA_LNK_FL_INTERFACE_LINK`` if the link is between an interface and an entity + + .. _MEDIA-LNK-FL-ANCILLARY-LINK: + + ``MEDIA_LNK_FL_ANCILLARY_LINK`` if the link is between two + different entities. This at present implies both MEDIA_LNK_FL_ENABLED + and MEDIA_LNK_FL_IMMUTABLE, however applications should not rely on + that being the case in the future.