linux-kernel - [RFC] ARM: dts: sama5d2: qspi DMA fixes spi DMA

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Message-Id: <1514317960-27094-1-git-send-email-aford173@gmail.com>
Date:   Tue, 26 Dec 2017 13:52:40 -0600
From:   Adam Ford <aford173@...il.com>
To:     nicolas.ferre@...rochip.com
Cc:     linux-kernel@...r.kernel.org, Adam Ford <aford173@...il.com>
Subject: [RFC] ARM: dts: sama5d2: qspi DMA fixes spi DMA

For some reason without this patch, using SPI0 with DMA yields the
following message:

atmel_spi f8000000.spi: DMA TX channel not available, SPI unable to use DMA

With the patch, trying to use SPI0 yields the following:

atmel_spi f8000000.spi: Using dma0chan0 (tx) and dma0chan1 (rx) for DMA transfers

The QSPI driver doesn't appear to me to be using the DMA but the
datasheet seems indicate the DMA is supported.  I am not sure why patch would
fix the errors, so I'm posting it as RFC.

Signed-off-by: Adam Ford <aford173@...il.com>

diff --git a/arch/arm/boot/dts/sama5d2.dtsi b/arch/arm/boot/dts/sama5d2.dtsi
index 61f68e5..fd55e91 100644
--- a/arch/arm/boot/dts/sama5d2.dtsi
+++ b/arch/arm/boot/dts/sama5d2.dtsi
@@ -999,6 +999,13 @@
 				reg = <0xf0020000 0x100>, <0xd0000000 0x08000000>;
 				reg-names = "qspi_base", "qspi_mmap";
 				interrupts = <52 IRQ_TYPE_LEVEL_HIGH 7>;
+				dmas = <&dma0
+					(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) |
+					 AT91_XDMAC_DT_PERID(4))>,
+				       <&dma0
+					(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) |
+					 AT91_XDMAC_DT_PERID(5))>;
+				dma-names = "tx", "rx";
 				clocks = <&qspi0_clk>;
 				#address-cells = <1>;
 				#size-cells = <0>;
@@ -1010,6 +1017,13 @@
 				reg = <0xf0024000 0x100>, <0xd8000000 0x08000000>;
 				reg-names = "qspi_base", "qspi_mmap";
 				interrupts = <53 IRQ_TYPE_LEVEL_HIGH 7>;
+				dmas = <&dma1
+					(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) |
+					 AT91_XDMAC_DT_PERID(48))>,
+				       <&dma0
+					(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) |
+					 AT91_XDMAC_DT_PERID(49))>;
+				dma-names = "tx", "rx";
 				clocks = <&qspi1_clk>;
 				#address-cells = <1>;
 				#size-cells = <0>;
-- 
2.7.4