From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Ujfalusi Subject: [PATCH v2 03/10] ARM: DTS: dra7: Use eDMA and add DAT port address for McASP3 Date: Mon, 7 Mar 2016 17:17:30 +0200 Message-ID: <1457363857-20797-4-git-send-email-peter.ujfalusi@ti.com> References: <1457363857-20797-1-git-send-email-peter.ujfalusi@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1457363857-20797-1-git-send-email-peter.ujfalusi@ti.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Tony Lindgren , paul@pwsan.com, robh+dt@kernel.org Cc: Tero Kristo , devicetree@vger.kernel.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org From: Misael Lopez Cruz 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 --- 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 b99f51288e71..4c192ea8ae29 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"; -- 2.7.2