Re: [PATCH v2 1/5] dmaengine: qcom: bam_dma: make bam clk optional

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Thanks for the Review,

On 14/02/18 15:41, Bjorn Andersson wrote:
bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
-	if (IS_ERR(bdev->bamclk))
-		return PTR_ERR(bdev->bamclk);
-
-	ret = clk_prepare_enable(bdev->bamclk);
-	if (ret) {
-		dev_err(bdev->dev, "failed to prepare/enable clock\n");
-		return ret;
+	if (IS_ERR(bdev->bamclk)) {
In the case of !bdev->controlled_remotely I think this should still be
an error.

Yep makes sense,

You mean something like this?

------------------------->cut<------------------------
        bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
        if (IS_ERR(bdev->bamclk)) {
                if (!bdev->controlled_remotely);
                        return PTR_ERR(bdev->bamclk);

                bdev->bamclk = NULL;
        }

        ret = clk_prepare_enable(bdev->bamclk);
        if (ret) {
                dev_err(bdev->dev, "failed to prepare/enable clock\n");
                return ret;
        }

------------------------->cut<------------------------


+		bdev->bamclk = NULL;
+	} else {
+		ret = clk_prepare_enable(bdev->bamclk);
+		if (ret) {
+			dev_err(bdev->dev, "failed to prepare/enable clock\n");
+			return ret;
+		}
The rest of the driver will keep operating the bamclk (which is okay),
so for symmetry purposes I think you should just keep the
clk_prepare_enable() block unmodified.

Yep, with above change, this block should be unchanged.


--srini
Regards,
Bjorn
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