Il 12/11/21 11:54, Yong Wu ha scritto:
Prepare for adding device_link.
The iommu consumer should use device_link to connect with the smi-larb(supplier). then the smi-larb should run before the iommu consumer. Here we delay the iommu driver until the smi driver is ready, then all the iommu consumers always are after the smi driver.
When there is no this patch, if some consumer drivers run before smi-larb, the supplier link_status is DL_DEV_NO_DRIVER(0) in the device_link_add, then device_links_driver_bound will use WARN_ON to complain that the link_status of supplier is not right.
device_is_bound may be more elegant here. but it is not allowed to EXPORT from https://lore.kernel.org/patchwork/patch/1334670/.
Signed-off-by: Yong Wu yong.wu@mediatek.com Tested-by: Frank Wunderlich frank-w@public-files.de # BPI-R2/MT7623
Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com