linux-kernel - [PATCH 5/7] dmaengine: sh: rz-dmac: Allow for multiple DMACs

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Message-Id: <20250206220308.76669-6-fabrizio.castro.jz@renesas.com>
Date: Thu,  6 Feb 2025 22:03:06 +0000
From: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To: Vinod Koul <vkoul@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	linux-renesas-soc@...r.kernel.org
Subject: [PATCH 5/7] dmaengine: sh: rz-dmac: Allow for multiple DMACs

dma_request_channel calls into __dma_request_channel with NULL
as value for np, which won't allow for the selection of the
correct DMAC when multiple DMACs are available.

Switch to using __dma_request_channel directly so that we can
choose the desired DMA for the channel. This is in preparation
of adding DMAC support for the Renesas RZ/V2H(P) and similar SoCs.

Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
---
 drivers/dma/sh/rz-dmac.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index 9235db551026..d7a4ce28040b 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -748,7 +748,8 @@ static struct dma_chan *rz_dmac_of_xlate(struct of_phandle_args *dma_spec,
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	return dma_request_channel(mask, rz_dmac_chan_filter, dma_spec);
+	return __dma_request_channel(&mask, rz_dmac_chan_filter, dma_spec,
+				     ofdma->of_node);
 }
 
 /*
-- 
2.34.1