On Monday 10 March 2014 15:41:51 Maxime Ripard wrote:

+/*
+ * Hardware representation of the LLI
+ *
+ * The hardware will be fed the physical address of this structure,
+ * and read its content in order to start the transfer.
+ */
+struct sun6i_dma_lli {
+	u32			cfg;
+	u32			src;
+	u32			dst;
+	u32			len;
+	u32			para;
+	u32			p_lli_next;
+	struct sun6i_dma_lli	*v_lli_next;
+} __packed;

It looks strange to have a pointer in a hardware structure, since
the pointer doesn't make sense to the device.

Also, the '__packed' attribute seems strange. Are you sure
you want to reduce the alignment from 4 bytes to 1 byte?

+static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
+{
+	struct sun6i_dma_dev *sdev = dev_id;
+	struct sun6i_vchan *vchan;
+	struct sun6i_pchan *pchan;
+	int i, j, ret = IRQ_NONE;
+	u32 status;
+
+	for (i = 0; i < 2; i++) {
+		status = readl(sdev->base + DMA_IRQ_STAT(i));
+		if (!status)
+			continue;
+
+		dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n",
+			i ? "high" : "low", status);
+
+		writel(status, sdev->base + DMA_IRQ_STAT(i));
+
+		for (j = 0; (j < 8) && status; j++) {
+			if (status & DMA_IRQ_QUEUE) {
+				pchan = sdev->pchans + j;
+				vchan = pchan->vchan;
+
+				if (vchan) {
+					unsigned long flags;
+
+					spin_lock_irqsave(&vchan->vc.lock,
+							  flags);

Interrupts are already disabled here.

+	sdc->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(sdc->clk)) {
+		dev_err(&pdev->dev, "No clock specified\n");
+		return PTR_ERR(sdc->clk);
+	}
+
+	mux = devm_clk_get(&pdev->dev, "ahb1_mux");
+	if (IS_ERR(mux)) {
+		dev_err(&pdev->dev, "Couldn't get AHB1 Mux\n");
+		return PTR_ERR(mux);
+	}
+
+	pll6 = devm_clk_get(&pdev->dev, "pll6");
+	if (IS_ERR(pll6)) {
+		dev_err(&pdev->dev, "Couldn't get PLL6\n");
+		return PTR_ERR(pll6);
+	}
+
+	ret = clk_set_parent(mux, pll6);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't reparent AHB1 on PLL6\n");
+		return ret;
+	}

Neither "pll6" nor "ahb1_mux" are listed in the DT binding. Also, why
is it the driver's business to set the parent?

	Arnd