From 125d925de49a1db2705cd67f7dd11a54312bf173 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Mon, 3 Feb 2020 17:30:46 +0000
Subject: [PATCH 0194/1085] staging: vchiq_arm: Give vchiq children DT nodes

vchiq kernel clients are now instantiated as platform drivers rather
than using DT, but the children of the vchiq interface may still
benefit from access to DT properties. Give them the option of a
a sub-node of the vchiq parent for configuration and to allow
them to be disabled.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 .../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -1785,12 +1785,20 @@ vchiq_register_child(struct platform_dev
 	pdevinfo.id = PLATFORM_DEVID_NONE;
 	pdevinfo.dma_mask = DMA_BIT_MASK(32);
 
+	np = of_get_child_by_name(pdev->dev.of_node, name);
+
+	/* Skip the child if it is explicitly disabled */
+	if (np && !of_device_is_available(np))
+		return NULL;
+
 	child = platform_device_register_full(&pdevinfo);
 	if (IS_ERR(child)) {
 		dev_warn(&pdev->dev, "%s not registered\n", name);
 		child = NULL;
 	}
 
+	child->dev.of_node = np;
+
 	/*
 	 * We want the dma-ranges etc to be copied from a device with the
 	 * correct dma-ranges for the VPU.
