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of/address: Translate 'dma-ranges' for parent nodes missing 'dma-ranges'
'dma-ranges' frequently exists without parent nodes having 'dma-ranges'. While this is an error for 'ranges', this is fine because DMA capable devices always have a translatable DMA address. Also, with no 'dma-ranges' at all, the assumption is that DMA addresses are 1:1 with no restrictions unless perhaps the device itself has implicit restrictions. Cc: Robin Murphy <robin.murphy@arm.com> Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Rob Herring <robh@kernel.org>
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@ -519,9 +519,13 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
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*
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* As far as we know, this damage only exists on Apple machines, so
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* This code is only enabled on powerpc. --gcl
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*
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* This quirk also applies for 'dma-ranges' which frequently exist in
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* child nodes without 'dma-ranges' in the parent nodes. --RobH
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*/
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ranges = of_get_property(parent, rprop, &rlen);
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if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
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if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
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strcmp(rprop, "dma-ranges")) {
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pr_debug("no ranges; cannot translate\n");
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return 1;
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}
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