On Fri, 21 Feb 2020 at 17:29, Ard Biesheuvel <ard.biesheu...@linaro.org> wrote:
>
> The dma-ranges DT property describes the DMA translation between a
> parent bus and its children, and so having a dma-ranges property in
> the root node makes little sense, but it doesn't harm either.
>
> However, recent kernels (v5.5+) have started spewing warnings into
> the kernel log of the following nature:
>
> OF: translation of DMA address(0) to CPU address failed node(/uart@2a400000)
> OF: translation of DMA address(0) to CPU address failed node(/pmu)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@70000000)
> OF: translation of DMA address(0) to CPU address failed node(/uart@51040000)
> OF: translation of DMA address(0) to CPU address failed node(/gpio@51000000)
> OF: translation of DMA address(0) to CPU address failed node(/i2c@51210000)
> OF: translation of DMA address(0) to CPU address failed node(/gpio-keys)
> OF: translation of DMA address(0) to CPU address failed
> node(/tpm_tis@10000000)
> OF: translation of DMA address(0) to CPU address failed
> node(/sdhci@52300000)
> OF: translation of DMA address(0) to CPU address failed
> node(/ethernet@522d0000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
> OF: translation of DMA address(0) to CPU address failed node(/pcie@60000000)
>
> and so we should probably get rid of this bogus dma-ranges property.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
> ---
> Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> b/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> index afb9e2c779df..2ee3821fca0b 100644
> --- a/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> +++ b/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
> @@ -21,7 +21,6 @@
> #address-cells = <2>;
> #size-cells = <2>;
> interrupt-parent = <&gic>;
> - dma-ranges = <0x0 0x0 0x0 0x0 0x100 0x0>;
>
> aliases {
> serial0 = &soc_uart0;
> --
> 2.17.1
>
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