dma-engine: sun4i: Add has_reset option to quirk

Allwinner suniv F1C100s has a reset bit for DMA in CCU. Sun4i do not
has this bit but in order to support suniv we need to add it. So add
support for reset bit.

Signed-off-by: Mesih Kilinc <mesihkilinc@gmail.com>
[ csokas.bence: Rebased and addressed comments ]
Signed-off-by: Csókás Bence <csokas.bence@prolan.hu>
Link: https://lore.kernel.org/r/20241122161128.2619172-3-csokas.bence@prolan.hu
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/sun4i-dma.c b/drivers/dma/sun4i-dma.c
index e1c8eeb18dc4adfccfa100f9a7d133366ca1125f..999ccd47a97101bfcb3fd2aa89dcecd47b5d4c5a 100644 (file)
--- a/drivers/dma/sun4i-dma.c
+++ b/drivers/dma/sun4i-dma.c
@@ -15,6 +15,7 @@
 #include <linux/of_dma.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
@@ -159,6 +160,7 @@ struct sun4i_dma_config {
        u8 ddma_drq_sdram;
 
        u8 max_burst;
+       bool has_reset;
 };
 
 struct sun4i_dma_pchan {
@@ -208,6 +210,7 @@ struct sun4i_dma_dev {
        int                             irq;
        spinlock_t                      lock;
        const struct sun4i_dma_config *cfg;
+       struct reset_control *rst;
 };
 
 static struct sun4i_dma_dev *to_sun4i_dma_dev(struct dma_device *dev)
@@ -1215,6 +1218,13 @@ static int sun4i_dma_probe(struct platform_device *pdev)
                return PTR_ERR(priv->clk);
        }
 
+       if (priv->cfg->has_reset) {
+               priv->rst = devm_reset_control_get_exclusive_deasserted(&pdev->dev, NULL);
+               if (IS_ERR(priv->rst))
+                       return dev_err_probe(&pdev->dev, PTR_ERR(priv->rst),
+                                            "Failed to get reset control\n");
+       }
+
        platform_set_drvdata(pdev, priv);
        spin_lock_init(&priv->lock);
 
@@ -1355,6 +1365,7 @@ static struct sun4i_dma_config sun4i_a10_dma_cfg = {
        .ddma_drq_sdram         = SUN4I_DDMA_DRQ_TYPE_SDRAM,
 
        .max_burst              = SUN4I_MAX_BURST,
+       .has_reset              = false,
 };
 
 static const struct of_device_id sun4i_dma_match[] = {