[PATCH] of: address: treat absent dma-ranges as 1:1 translation

[Sascha Hauer]

On Wed, May 18, 2022 at 07:57:45PM +0200, Lucas Stach wrote:
> Some DTs use dma-ranges in child busses without this property being present
> in the parent bus. To avoid failing the address translation, do the same as
> the Linux kernel and treat absence of this property as a 1:1 translation.
> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
>  drivers/of/address.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index 67e8062f5d17..4eafce376d36 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -301,10 +301,13 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
>  	 *
>  	 * As far as we know, this damage only exists on Apple machines, so
>  	 * This code is only enabled on powerpc. --gcl
> +	 *
> +	 * This quirk also applies for 'dma-ranges' which frequently exist in
> +	 * child nodes without 'dma-ranges' in the parent nodes. --RobH
>  	 */
>  	ranges = of_get_property(parent, rprop, &rlen);
>  #if !defined(CONFIG_PPC)
> -	if (ranges == NULL) {
> +	if (ranges == NULL && strcmp(rprop, "dma-ranges")) {
>  		pr_vdebug("OF: no ranges; cannot translate\n");
>  		return 1;
>  	}
> -- 
> 2.35.3
> 
> 
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> 

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