<html><body bgcolor="#FFFFFF"><div></div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); font-size: medium; "><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Courier New'; ">I am running Linux 2.6.32 on a P2020 and am trying to use the kernel’s DMA code. So far, I have had no success. Is there a mistake in linux/arch/powerc/boot/dts/p2020rdb.dts?<o:p></o:p></span></p><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></span></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; ">According to linux/Documentation/powerpc/dts-bindings/fsl/dma.txt, the compatible lists for DMA controllers and the DMA channel nodes should have “2 entries, first is ‘fsl,CHIP-dma’, where CHIP is the processor (mpc8349, mpc8360, etc.) and the second is ‘fsl,elo-dma.’” In p2020rdb.dts, the compatible lists for the DMA controller and the DMA channel nodes are "fsl,eloplus-dma" and "fsl,eloplus-dma-channel," respectively. Note that each has only one entry.<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; ">Should compatible = “fsl,P2020RDB-dma”, "fsl,eloplus-dma" for the DMA controllers?, and<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; ">Should compatible = “fsl,P2020RDB-dma”, " fsl,eloplus-dma-channel" for the DMA channel nodes?<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; ">The device tree source for DMA in p2020rdb.dts is:<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma@c300 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> #address-cells = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> #size-cells = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0xc300 0x4>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> ranges = <0x0 0xc100 0x200>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@0 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x0 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <0>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <76 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@80 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x80 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <77 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@100 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x100 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <78 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@180 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x180 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <3>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <79 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma@21300 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> #address-cells = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> #size-cells = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x21300 0x4>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> ranges = <0x0 0x21100 0x200>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <0>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@0 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x0 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <0>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <20 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@80 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x80 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <1>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <21 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@100 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x100 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <22 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> dma-channel@180 {<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> compatible = "fsl,eloplus-dma-channel";<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> reg = <0x180 0x80>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> cell-index = <3>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupt-parent = <&mpic>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> interrupts = <23 2>;<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "> };<o:p></o:p></p><p class="MsoPlainText" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 10pt; font-family: 'Courier New'; "><o:p> </o:p></p><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></span></p></span></body></html>