Re: [PATCH 1/4] dmaengine: qcom: bam_dma: make bam clk optional

[Vinod Koul]

On Mon, Jan 22, 2018 at 09:55:01AM +0000, Srinivas Kandagatla wrote:

> >>@@ -1180,13 +1180,14 @@ static int bam_dma_probe(struct platform_device *pdev)
> >>  						"qcom,controlled-remotely");
> >>  	bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
> >
> >but you still do clk_get unconditionally?
> 
> Only reason to do this way is to not break existing users in the mainline.
> 
> remotely controlled BAM is already supported in upstream driver, there are
> users of this who pass clk from device tree, If I make this conditional then
> subsequent reads to the BAM registers for those instances might crash the
> system.

But these instances are remote controlled, so if we stop representing them
in Linux, why would we read them?

-- 
~Vinod