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| author | Zhen Lei <thunder.leizhen@huawei.com> | 2020-10-16 17:08:32 +0800 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2020-11-17 15:08:43 +0100 |
| commit | 2013a4b684b6eb614ee5c9a3c07b0ae6f5ca96d9 (patch) | |
| tree | 424e0d0dc3cd16b9e268cb6d7029e1abd8abf7fa /scripts/bpf_helpers_doc.py | |
| parent | f8394f232b1eab649ce2df5c5f15b0e528c92091 (diff) | |
arm64: dts: broadcom: clear the warnings caused by empty dma-ranges
The scripts/dtc/checks.c requires that the node have empty "dma-ranges"
property must have the same "#address-cells" and "#size-cells" values as
the parent node. Otherwise, the following warnings is reported:
arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning \
(dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but \
its #address-cells (1) differs from / (2)
arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning \
(dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but \
its #size-cells (1) differs from / (2)
Arnd Bergmann figured out why it's necessary:
Also note that the #address-cells=<1> means that any device under
this bus is assumed to only support 32-bit addressing, and DMA will
have to go through a slow swiotlb in the absence of an IOMMU.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20201016090833.1892-2-thunder.leizhen@huawei.com'
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'scripts/bpf_helpers_doc.py')
0 files changed, 0 insertions, 0 deletions