On Thu 27 Oct 18:54 PDT 2016, Stephen Boyd wrote:
> On 10/19, Georgi Djakov wrote:
> > Add a driver for the A53 Clock Controller. It is a hardware block that
> > implements a combined mux and half integer divider functionality. It can
> > choose between a fixed-rate clock or the dedicated A53 PLL. The source
> > and the divider can be set both at the same time.
> >
> > This is required for enabling CPU frequency scaling on platforms like
> > MSM8916.
> >
>
> Please Cc DT reviewers.
>
> > Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
> > ---
> > .../devicetree/bindings/clock/qcom,a53cc.txt | 22 +++
> > drivers/clk/qcom/Kconfig | 8 ++
> > drivers/clk/qcom/Makefile | 1 +
> > drivers/clk/qcom/a53cc.c | 155 +++++++++++++++++++++
> > 4 files changed, 186 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/clock/qcom,a53cc.txt
> > create mode 100644 drivers/clk/qcom/a53cc.c
> >
> > diff --git a/Documentation/devicetree/bindings/clock/qcom,a53cc.txt b/Documentation/devicetree/bindings/clock/qcom,a53cc.txt
> > new file mode 100644
> > index 000000000000..a025f062f177
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/qcom,a53cc.txt
> > @@ -0,0 +1,22 @@
> > +Qualcomm A53 CPU Clock Controller Binding
> > +------------------------------------------------
> > +The A53 CPU Clock Controller is hardware, which provides a combined
> > +mux and divider functionality for the CPU clocks. It can choose between
> > +a fixed rate clock and the dedicated A53 PLL.
> > +
> > +Required properties :
> > +- compatible : shall contain:
> > +
> > + "qcom,a53cc"
> > +
> > +- reg : shall contain base register location and length
> > + of the APCS region
> > +- #clock-cells : shall contain 1
> > +
> > +Example:
> > +
> > + apcs: syscon@b011000 {
> > + compatible = "qcom,a53cc", "syscon";
>
> Why is it a syscon? Is that part used?
>
I use the register at offset 8 for interrupting the other subsystems, so
this must be available as something I can poke.
Which makes me think that this should be described as a "simple-mfd" and
"syscon" with the a53cc node as a child - grabbing the regmap of the
syscon parent, rather then ioremapping the same region again.
Regards,
Bjorn
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