[PATCH v5 4/6] dt-bindings: dma: fsl-edma: add new i.mx7ulp-edma

yibin.gong
2019-06-25T09:43:52Z

More channel interrupts, one more clock, and only one
dmamux on i.mx7ulp-edma.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
---
Documentation/devicetree/bindings/dma/fsl-edma.txt | 44 +++++++++++++++++++---
1 file changed, 39 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/fsl-edma.txt b/Documentation/devicetree/bindings/dma/fsl-edma.txt
index 97e213e..29dd3cc 100644
--- a/Documentation/devicetree/bindings/dma/fsl-edma.txt
+++ b/Documentation/devicetree/bindings/dma/fsl-edma.txt
@@ -9,15 +9,16 @@ group, DMAMUX0 or DMAMUX1, but not both.
Required properties:
- compatible :
- "fsl,vf610-edma" for eDMA used similar to that on Vybrid vf610 SoC
+ - "fsl,imx7ulp-edma" for eDMA2 used similar to that on i.mx7ulp
- reg : Specifies base physical address(s) and size of the eDMA registers.
The 1st region is eDMA control register's address and size.
The 2nd and the 3rd regions are programmable channel multiplexing
control register's address and size.
- interrupts : A list of interrupt-specifiers, one for each entry in
- interrupt-names.
-- interrupt-names : Should contain:
- "edma-tx" - the transmission interrupt
- "edma-err" - the error interrupt
+ interrupt-names on vf610 similar SoC. But for i.mx7ulp per channel
+ per transmission interrupt, total 16 channel interrupt and 1
+ error interrupt(located in the last), no interrupt-names list on
+ i.mx7ulp for clean on dts.
- #dma-cells : Must be <2>.
The 1st cell specifies the DMAMUX(0 for DMAMUX0 and 1 for DMAMUX1).
Specific request source can only be multiplexed by specific channels
@@ -28,6 +29,7 @@ Required properties:
- clock-names : A list of channel group clock names. Should contain:
"dmamux0" - clock name of mux0 group
"dmamux1" - clock name of mux1 group
+ Note: No dmamux0 on i.mx7ulp, but another 'dma' clk added on i.mx7ulp.
- clocks : A list of phandle and clock-specifier pairs, one for each entry in
clock-names.

@@ -35,6 +37,10 @@ Optional properties:
- big-endian: If present registers and hardware scatter/gather descriptors
of the eDMA are implemented in big endian mode, otherwise in little
mode.
+- interrupt-names : Should contain the below on vf610 similar SoC but not used
+ on i.mx7ulp similar SoC:
+ "edma-tx" - the transmission interrupt
+ "edma-err" - the error interrupt

Examples:
@@ -52,8 +58,36 @@ edma0: dma-controller@40018000 {
clock-names = "dmamux0", "dmamux1";
clocks = <&clks VF610_CLK_DMAMUX0>,
<&clks VF610_CLK_DMAMUX1>;
-};
+}; /* vf610 */

+edma1: dma-controller@40080000 {
+ #dma-cells = <2>;
+ compatible = "fsl,imx7ulp-edma";
+ reg = <0x40080000 0x2000>,
+ <0x40210000 0x1000>;
+ dma-channels = <32>;
+ interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>,
+ /* last is eDMA2-ERR interrupt */
+ <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
+ clock-names = "dma", "dmamux0";
+ clocks = <&pcc2 IMX7ULP_CLK_DMA1>,
+ <&pcc2 IMX7ULP_CLK_DMA_MUX1>;
+}; /* i.mx7ulp */

* DMA clients
DMA client drivers that uses the DMA function must use the format described