diff options
| author | Bin Meng | 2021-04-30 21:16:58 +0800 |
|---|---|---|
| committer | Simon Glass | 2021-06-05 07:35:34 -0600 |
| commit | 139eaa7a2b5f25e42307a672849eba0e5b4cddf0 (patch) | |
| tree | 3eedf1e2ce3481018ef1325ea358747d3893eaf8 /drivers/core | |
| parent | c003d2cd6b415319c3e40db42b48c2815acda3d3 (diff) | |
of: addr: 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.
This keeps in sync with Linux kernel commit:
81db12ee15cb: of/address: Translate 'dma-ranges' for parent nodes missing 'dma-ranges'
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/core')
| -rw-r--r-- | drivers/core/of_addr.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/core/of_addr.c b/drivers/core/of_addr.c index 9b77308182d..a3af48fd885 100644 --- a/drivers/core/of_addr.c +++ b/drivers/core/of_addr.c @@ -192,9 +192,13 @@ static int of_translate_one(const struct device_node *parent, * * 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 (ranges == NULL && !of_empty_ranges_quirk(parent)) { + if (ranges == NULL && !of_empty_ranges_quirk(parent) && + strcmp(rprop, "dma-ranges")) { debug("no ranges; cannot translate\n"); return 1; } |