linux-kernel - [PATCH v3 3/5] spi: core: add dma_map

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Date:   Fri, 25 Jun 2021 10:52:11 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Brown <broonie@...nel.org>, Wolfram Sang <wsa@...nel.org>
Cc:     Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-spi@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/5] spi: core: add dma_map_dev for dma device

Some controllers like qcom geni need the parent device to be used for
dma mapping, so add a dma_map_dev field and let drivers fill this to be
used as mapping device

Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 drivers/spi/spi.c       | 4 ++++
 include/linux/spi/spi.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index e353b7a9e54e..315f7e7545f7 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -961,11 +961,15 @@ static int __spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg)
 
 	if (ctlr->dma_tx)
 		tx_dev = ctlr->dma_tx->device->dev;
+	else if (ctlr->dma_map_dev)
+		tx_dev = ctlr->dma_map_dev;
 	else
 		tx_dev = ctlr->dev.parent;
 
 	if (ctlr->dma_rx)
 		rx_dev = ctlr->dma_rx->device->dev;
+	else if (ctlr->dma_map_dev)
+		rx_dev = ctlr->dma_map_dev;
 	else
 		rx_dev = ctlr->dev.parent;
 
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 74239d65c7fd..4d3f116f5723 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -586,6 +586,7 @@ struct spi_controller {
 	bool			(*can_dma)(struct spi_controller *ctlr,
 					   struct spi_device *spi,
 					   struct spi_transfer *xfer);
+	struct device *dma_map_dev;
 
 	/*
 	 * These hooks are for drivers that want to use the generic
-- 
2.31.1