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Enable an optional clock and deassert an optional reset before accessing the controller registers. Use the deasserted reset helper rather than requesting a reset pulse. This also supports reset controllers that only implement assert and deassert operations. Both resources remain optional, so existing integrations without them are unchanged. Signed-off-by: Jelly Jia --- drivers/dma/arm-dma350.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/dma/arm-dma350.c b/drivers/dma/arm-dma350.c index cfe3bacfab68..2f22f8a0ab47 100644 --- a/drivers/dma/arm-dma350.c +++ b/drivers/dma/arm-dma350.c @@ -4,6 +4,7 @@ #include #include +#include #include #include #include @@ -14,6 +15,7 @@ #include #include #include +#include #include #include @@ -1247,12 +1249,24 @@ static void d350_free_chan_resources(struct dma_chan *chan) static int d350_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct reset_control *reset; + struct clk *clk; struct d350 *dmac; void __iomem *base; u32 reg; int ret, nchan, dw, aw, r, p; bool coherent, memset; + clk = devm_clk_get_optional_enabled(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), + "failed to enable clock\n"); + + reset = devm_reset_control_get_optional_exclusive_deasserted(dev, NULL); + if (IS_ERR(reset)) + return dev_err_probe(dev, PTR_ERR(reset), + "failed to deassert reset\n"); + base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) return PTR_ERR(base); -- 2.54.0