usb: musb: omap2430: Fix probe regression for missing resources

Probe for omap2430 glue layer is now broken for interrupt resources in
all cases.

Commit  2390710 ("partially Revert "usb: musb: Set the DT node on the
child device"") broke probing for SoCs using ti-sysc interconnect target
module as the dt node is not found.

Commit a1a2b71 ("of/platform: Drop static setup of IRQ resource from
DT core") caused omap3 to fail with error "-ENXIO: IRQ mc not found" as
the IRQ resources are no longer automatically populated from devicetree.

Let's fix the issues by calling device_set_of_node_from_dev() only if the
SoC has been updated to probe with ti-sysc. And for legacy SoCs, let's
populate the resources manually as needed.

Note that once we have updated the SoCs to probe with proper devicetree
data in all cases, this is no longer needed. But doing that requires
patching both devicetree and SoC code, so let's fix the probe issues first.

Fixes: a1a2b71 ("of/platform: Drop static setup of IRQ resource from DT core")
Fixes: 2390710 ("partially Revert "usb: musb: Set the DT node on the child device"")
Cc: H. Nikolaus Schaller <[email protected]>
Reported-by: Sicelo Mhlongo <[email protected]>
Tested-by: Sicelo Mhlongo <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: tmlind

drivers/usb/musb/omap2430.c

@@ -15,6 +15,7 @@
 #include <linux/list.h>
 #include <linux/io.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
@@ -310,6 +311,7 @@ static int omap2430_probe(struct platform_device *pdev)
 	struct device_node		*control_node;
 	struct platform_device		*control_pdev;
 	int				ret = -ENOMEM, val;
+	bool				populate_irqs = false;
 
 	if (!np)
 		return -ENODEV;
@@ -328,6 +330,18 @@ static int omap2430_probe(struct platform_device *pdev)
 	musb->dev.dma_mask		= &omap2430_dmamask;
 	musb->dev.coherent_dma_mask	= omap2430_dmamask;
 
+	/*
+	 * Legacy SoCs using omap_device get confused if node is moved
+	 * because of interconnect properties mixed into the node.
+	 */
+	if (of_get_property(np, "ti,hwmods", NULL)) {
+		dev_warn(&pdev->dev, "please update to probe with ti-sysc\n");
+		populate_irqs = true;
+	} else {
+		device_set_of_node_from_dev(&musb->dev, &pdev->dev);
+	}
+	of_node_put(np);
+
 	glue->dev			= &pdev->dev;
 	glue->musb			= musb;
 	glue->status			= MUSB_UNKNOWN;
@@ -389,6 +403,46 @@ static int omap2430_probe(struct platform_device *pdev)
 		goto err2;
 	}
 
+	if (populate_irqs) {
+		struct resource musb_res[3];
+		struct resource *res;
+		int i = 0;
+
+		memset(musb_res, 0, sizeof(*musb_res) * ARRAY_SIZE(musb_res));
+
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		if (!res)
+			goto err2;
+
+		musb_res[i].start = res->start;
+		musb_res[i].end = res->end;
+		musb_res[i].flags = res->flags;
+		musb_res[i].name = res->name;
+		i++;
+
+		ret = of_irq_get_byname(np, "mc");
+		if (ret > 0) {
+			musb_res[i].start = ret;
+			musb_res[i].flags = IORESOURCE_IRQ;
+			musb_res[i].name = "mc";
+			i++;
+		}
+
+		ret = of_irq_get_byname(np, "dma");
+		if (ret > 0) {
+			musb_res[i].start = ret;
+			musb_res[i].flags = IORESOURCE_IRQ;
+			musb_res[i].name = "dma";
+			i++;
+		}
+
+		ret = platform_device_add_resources(musb, musb_res, i);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to add IRQ resources\n");
+			goto err2;
+		}
+	}
+
 	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add platform_data\n");