On 9/9/19 1:18 PM, Geert Uytterhoeven wrote: > Hi Marek, Hi, > On Sat, Sep 7, 2019 at 6:16 PM Marek Vasut wrote: >> >> Add dma-ranges property into /soc node to describe the DMA capabilities >> of the bus. This is currently needed to translate PCI DMA ranges, which >> are limited to 32bit addresses. > >> --- a/arch/arm64/boot/dts/renesas/r8a7795.dtsi >> +++ b/arch/arm64/boot/dts/renesas/r8a7795.dtsi >> @@ -330,6 +330,7 @@ >> #address-cells = <2>; >> #size-cells = <2>; >> ranges; >> + dma-ranges = <0 0x40000000 0 0x40000000 0 0xc0000000>; > > Shouldn't the length be 0x80000000 (for all SoCs)? Or should that match the amount of DRAM below 32bit boundary ? > Or should we allow DMA to internal System RAM, too? I think we should include SRAM, yes. -- Best regards, Marek Vasut
