[PATCH v3 2/7] dmaengine: sun6i: Add a quirk for additional mbus clock

[Clément Péron]

From: Jernej Skrabec <jernej.skra...@siol.net>

H6 DMA controller needs additional mbus clock to be enabled.

Add a quirk for it and handle it accordingly.

Signed-off-by: Jernej Skrabec <jernej.skra...@siol.net>
Signed-off-by: Clément Péron <peron.c...@gmail.com>
---
 drivers/dma/sun6i-dma.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 0cd13f17fc11..7d9606997251 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -129,6 +129,7 @@ struct sun6i_dma_config {
        u32 dst_burst_lengths;
        u32 src_addr_widths;
        u32 dst_addr_widths;
+       bool has_mbus_clk;
 };
 
 /*
@@ -182,6 +183,7 @@ struct sun6i_dma_dev {
        struct dma_device       slave;
        void __iomem            *base;
        struct clk              *clk;
+       struct clk              *clk_mbus;
        int                     irq;
        spinlock_t              lock;
        struct reset_control    *rstc;
@@ -1208,6 +1210,14 @@ static int sun6i_dma_probe(struct platform_device *pdev)
                return PTR_ERR(sdc->clk);
        }
 
+       if (sdc->cfg->has_mbus_clk) {
+               sdc->clk_mbus = devm_clk_get(&pdev->dev, "mbus");
+               if (IS_ERR(sdc->clk_mbus)) {
+                       dev_err(&pdev->dev, "No mbus clock specified\n");
+                       return PTR_ERR(sdc->clk_mbus);
+               }
+       }
+
        sdc->rstc = devm_reset_control_get(&pdev->dev, NULL);
        if (IS_ERR(sdc->rstc)) {
                dev_err(&pdev->dev, "No reset controller specified\n");
@@ -1312,11 +1322,19 @@ static int sun6i_dma_probe(struct platform_device *pdev)
                goto err_reset_assert;
        }
 
+       if (sdc->cfg->has_mbus_clk) {
+               ret = clk_prepare_enable(sdc->clk_mbus);
+               if (ret) {
+                       dev_err(&pdev->dev, "Couldn't enable mbus clock\n");
+                       goto err_clk_disable;
+               }
+       }
+
        ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0,
                               dev_name(&pdev->dev), sdc);
        if (ret) {
                dev_err(&pdev->dev, "Cannot request IRQ\n");
-               goto err_clk_disable;
+               goto err_mbus_clk_disable;
        }
 
        ret = dma_async_device_register(&sdc->slave);
@@ -1341,6 +1359,8 @@ static int sun6i_dma_probe(struct platform_device *pdev)
        dma_async_device_unregister(&sdc->slave);
 err_irq_disable:
        sun6i_kill_tasklet(sdc);
+err_mbus_clk_disable:
+       clk_disable_unprepare(sdc->clk_mbus);
 err_clk_disable:
        clk_disable_unprepare(sdc->clk);
 err_reset_assert:
@@ -1359,6 +1379,7 @@ static int sun6i_dma_remove(struct platform_device *pdev)
 
        sun6i_kill_tasklet(sdc);
 
+       clk_disable_unprepare(sdc->clk_mbus);
        clk_disable_unprepare(sdc->clk);
        reset_control_assert(sdc->rstc);
 
-- 
2.20.1