From 0c92de2cd56d856af7ab3c82c8f46bb854b81c13 Mon Sep 17 00:00:00 2001 From: Misael Lopez Cruz Date: Mon, 7 Mar 2016 17:17:30 +0200 Subject: [PATCH] ARM: dts: dra7: Use eDMA and add DAT port address for McASP3 McASP3 does not support constant addressing mode on the DAT port, so increment transfers must be used instead. This restriction is also applicable for McASP1 and McASP2. This DMA addressing constraint poses a major problem for sDMA where constant addressing mode is used on the peripheral side. Unfortunately, using increment transfers in sDMA comes with important side effects. The addressing mode used in eDMA is INC, so the silicon limitation described above has no impact and the McASP3 DAT port can be safely added by switching to eDMA instead of sDMA. Signed-off-by: Misael Lopez Cruz Signed-off-by: Peter Ujfalusi Signed-off-by: Tony Lindgren --- arch/arm/boot/dts/dra7.dtsi | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi index 1d54d311c46a..19c96f7a72da 100644 --- a/arch/arm/boot/dts/dra7.dtsi +++ b/arch/arm/boot/dts/dra7.dtsi @@ -1469,12 +1469,13 @@ mcasp3: mcasp@48468000 { compatible = "ti,dra7-mcasp-audio"; ti,hwmods = "mcasp3"; - reg = <0x48468000 0x2000>; - reg-names = "mpu"; + reg = <0x48468000 0x2000>, + <0x46000000 0x1000>; + reg-names = "mpu","dat"; interrupts = , ; interrupt-names = "tx", "rx"; - dmas = <&sdma_xbar 133>, <&sdma_xbar 132>; + dmas = <&edma_xbar 133 1>, <&edma_xbar 132 1>; dma-names = "tx", "rx"; clocks = <&mcasp3_aux_gfclk_mux>, <&mcasp3_ahclkx_mux>; clock-names = "fck", "ahclkx"; -- 2.20.1