From e0c827aca0730b51f38081aa4e8ecf0912aab55f Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Sat, 10 Nov 2018 13:16:51 +0200 Subject: drm/omap: Populate DSS children in omapdss driver The DSS DT node contains children that describe the DSS components (DISPC and internal encoders). Each of those components is handled by a platform driver, and thus needs to be backed by a platform device. The corresponding platform devices are created in mach-omap2 code by a call to of_platform_populate(). While this approach has worked so far, it doesn't model the hardware architecture very well, as it creates child devices before the parent is ready to handle them. This would be akin to creating I2C slaves before the I2C master is available. The task can be easily performed in the omapdss driver code instead, simplifying mach-omap2 code. We however can't remove the mach-omap2 code completely as the omap2fb driver still depends on it, but we can move it to the omap2fb-specific section, where it can stay until the omap2fb driver gets removed. This has the added benefit of not allowing DSS components to probe before the DSS itself, which led to runtime PM issues when the DSS probe is deferred. Fixes: 27d624527d99 ("drm/omap: dss: Acquire next dssdev at probe time") Signed-off-by: Laurent Pinchart Acked-by: Tony Lindgren Reviewed-by: Sebastian Reichel Signed-off-by: Tomi Valkeinen Link: https://patchwork.freedesktop.org/patch/msgid/20181110111654.4387-2-laurent.pinchart@ideasonboard.com --- drivers/gpu/drm/omapdrm/dss/dss.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'drivers/gpu') diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c index 1aaf260aa9b8..7553c7fc1c45 100644 --- a/drivers/gpu/drm/omapdrm/dss/dss.c +++ b/drivers/gpu/drm/omapdrm/dss/dss.c @@ -1484,16 +1484,23 @@ static int dss_probe(struct platform_device *pdev) dss); /* Add all the child devices as components. */ + r = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); + if (r) + goto err_uninit_debugfs; + omapdss_gather_components(&pdev->dev); device_for_each_child(&pdev->dev, &match, dss_add_child_component); r = component_master_add_with_match(&pdev->dev, &dss_component_ops, match); if (r) - goto err_uninit_debugfs; + goto err_of_depopulate; return 0; +err_of_depopulate: + of_platform_depopulate(&pdev->dev); + err_uninit_debugfs: dss_debugfs_remove_file(dss->debugfs.clk); dss_debugfs_remove_file(dss->debugfs.dss); @@ -1522,6 +1529,8 @@ static int dss_remove(struct platform_device *pdev) { struct dss_device *dss = platform_get_drvdata(pdev); + of_platform_depopulate(&pdev->dev); + component_master_del(&pdev->dev, &dss_component_ops); dss_debugfs_remove_file(dss->debugfs.clk); -- cgit v1.2.3-55-g7522