[v12,01/38] drm/doc: document recommended component helper usage

Submitted by Ramalingam C on Feb. 9, 2019, 7:11 a.m.

Details

Message ID 1549696309-28164-2-git-send-email-ramalingam.c@intel.com
State New
Series "drm/i915: Implement HDCP2.2"
Headers show

Commit Message

Ramalingam C Feb. 9, 2019, 7:11 a.m.
From: Daniel Vetter <daniel.vetter@intel.com>

Now that component has docs it's worth spending a few words and
hyperlinks on recommended best practices in drm.

Cc: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 Documentation/driver-api/component.rst |  2 ++
 Documentation/gpu/drm-internals.rst    |  5 +++++
 drivers/gpu/drm/drm_drv.c              | 14 ++++++++++++++
 3 files changed, 21 insertions(+)

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diff --git a/Documentation/driver-api/component.rst b/Documentation/driver-api/component.rst
index 2da4a8f20607..57e37590733f 100644
--- a/Documentation/driver-api/component.rst
+++ b/Documentation/driver-api/component.rst
@@ -1,3 +1,5 @@ 
+.. _component:
+
 ======================================
 Component Helper for Aggregate Drivers
 ======================================
diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst
index 3ae23a5454ac..966bd2d9f0cc 100644
--- a/Documentation/gpu/drm-internals.rst
+++ b/Documentation/gpu/drm-internals.rst
@@ -93,6 +93,11 @@  Device Instance and Driver Handling
 Driver Load
 -----------
 
+Component Helper Usage
+~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/gpu/drm/drm_drv.c
+   :doc: component helper usage recommendations
 
 IRQ Helper Library
 ~~~~~~~~~~~~~~~~~~
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 381581b01d48..aae413003705 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -457,6 +457,20 @@  static void drm_fs_inode_free(struct inode *inode)
 }
 
 /**
+ * DOC: component helper usage recommendations
+ *
+ * DRM drivers that drive hardware where a logical device consists of a pile of
+ * independent hardware blocks are recommended to use the :ref:`component helper
+ * library<component>`. The entire device initialization procedure should be run
+ * from the &component_master_ops.master_bind callback, starting with
+ * drm_dev_init(), then binding all components with component_bind_all() and
+ * finishing with drm_dev_register(). For consistency and easier sharing of
+ * components across drivers the opaque pointer passed to all components through
+ * component_bind_all() should point at &struct drm_device of the device
+ * instance, not some driver specific private structure.
+ */
+
+/**
  * drm_dev_init - Initialise new DRM device
  * @dev: DRM device
  * @driver: DRM driver