On 10/07/2018 04:59 PM, Vinod wrote: > On 28-09-18, 15:01, Pierre-Yves MORDRET wrote: >> From: M'boumba Cedric Madianga <cedric.madianga@xxxxxxxxx> >> >> This patch adds the description of the 2 properties needed to support M2M >> transfer triggered by STM32 DMA when his transfer is complete. >> >> Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@xxxxxx> >> --- >> Version history: >> v3: >> v2: >> * rework content >> v1: >> * Initial >> --- >> --- >> Documentation/devicetree/bindings/dma/stm32-mdma.txt | 12 ++++++++---- >> 1 file changed, 8 insertions(+), 4 deletions(-) >> >> diff --git a/Documentation/devicetree/bindings/dma/stm32-mdma.txt b/Documentation/devicetree/bindings/dma/stm32-mdma.txt >> index d18772d..27c2812 100644 >> --- a/Documentation/devicetree/bindings/dma/stm32-mdma.txt >> +++ b/Documentation/devicetree/bindings/dma/stm32-mdma.txt >> @@ -10,7 +10,7 @@ Required properties: >> - interrupts: Should contain the MDMA interrupt. >> - clocks: Should contain the input clock of the DMA instance. >> - resets: Reference to a reset controller asserting the DMA controller. >> -- #dma-cells : Must be <5>. See DMA client paragraph for more details. >> +- #dma-cells : Must be <6>. See DMA client paragraph for more details. > > can you update the example for 6 cells? of course. > > Also what happens to dts using 5 cells.. They are not managed, but it should. I will update this flaw. Thanks for pointing this out. > >> >> Optional properties: >> - dma-channels: Number of DMA channels supported by the controller. >> @@ -26,7 +26,7 @@ Example: >> interrupts = <122>; >> clocks = <&timer_clk>; >> resets = <&rcc 992>; >> - #dma-cells = <5>; >> + #dma-cells = <6>; >> dma-channels = <16>; >> dma-requests = <32>; >> st,ahb-addr-masks = <0x20000000>, <0x00000000>; >> @@ -35,8 +35,8 @@ Example: >> * DMA client >> >> DMA clients connected to the STM32 MDMA controller must use the format >> -described in the dma.txt file, using a five-cell specifier for each channel: >> -a phandle to the MDMA controller plus the following five integer cells: >> +described in the dma.txt file, using a six-cell specifier for each channel: >> +a phandle to the MDMA controller plus the following six integer cells: >> >> 1. The request line number >> 2. The priority level >> @@ -76,6 +76,10 @@ a phandle to the MDMA controller plus the following five integer cells: >> if no HW ack signal is used by the MDMA client >> 5. A 32bit mask specifying the value to be written to acknowledge the request >> if no HW ack signal is used by the MDMA client >> +6. A bitfield value specifying if the MDMA client wants to generate M2M >> + transfer with HW trigger (1) or not (0). This bitfield should be only >> + enabled for M2M transfer triggered by STM32 DMA client. The memory devices >> + involved in this kind of transfer are SRAM and DDR. >> >> Example: >> >> -- >> 2.7.4 >
