Re: [PATCH] ARM: dts: msm8974: Add definitions for QCE & cryptobam

From: Iaroslav Gridin
Date: Fri Sep 16 2016 - 07:59:33 EST

On Thu, Sep 15, 2016 at 04:18:42PM -0500, Andy Gross wrote:
> Actually, on thinking about this more, the bam block itself only
> requires the
> single clock. The peripheral it is attached to has to keep its sanity
> during
> the duration of the transfer (crypto). The crypto requires 3 clocks,
> one of
> which is the same clk the bam requires.
> You can access the BAM registers with the bam_clk only, correct?

No, with only bam_clk board reboots. In fact, core_clk is the only
required one.

> The CLK_SRC is unnecessary. Or should be at least. That gets turned
> on by
> getting the CE2_CLK. I vaguely remember a parent issue that was
> fixed.

Yes, I thought it was required to change its speed to achieve maximum
QCE performance but as it have been pointed out, same adjustment on core
clock does the same.