On Fri, Dec 11, 2020 at 12:16 PM Bjorn Andersson
<bjorn.andersson@xxxxxxxxxx> wrote:
>
> On Mon 12 Oct 21:12 CDT 2020, Shawn Guo wrote:
>
> > On MSM8916, only one qcom-apcs-msm8916-clk device is needed, as there is
> > only one APCS clock. However, on MSM8939 three APCS clocks need to be
> > registered for cluster0 (little cores), cluster1 (big cores) and CCI
> > (Cache Coherent Interconnect). That said, we will need to register 3
> > qcom-apcs-msm8916-clk devices. Let's use PLATFORM_DEVID_AUTO rather
> > than PLATFORM_DEVID_NONE for platform_device_register_data() call.
> > Otherwise, the second APCS clock registration will fail due to duplicate
> > device name.
> >
> > [ 0.519657] sysfs: cannot create duplicate filename '/bus/platform/devices/qcom-apcs-msm8916-clk'
> > ...
> > [ 0.661158] qcom_apcs_ipc b111000.mailbox: failed to register APCS clk
> >
>
> Spotted this as I was looking for another patch, hence the late reply.
> But it seems this was never reviewed or merged.
>
> What does the bigger picture look like? Do we have 3 APCS global, or
> it's a single memory region that provides the 3 clocks? How does the
> qcom-apcs-msm8916-clk with it's hard coded offset of 0x50 deal with
> this? (Is this a single qcom-apcs-msm8939-clk that registers 3 clocks
> instead? Making this patch unnecessary?)
We have 3 APCS global instances. I haven't got time to send out other
related patches, but the DT for these 3 APCS global looks like below.
apcs2: mailbox@b1d1000 {
compatible = "qcom,msm8916-apcs-kpss-global", "syscon";
reg = <0xb1d1000 0x1000>;
#mbox-cells = <1>;
clocks = <&a53pll_cci>, <&gcc GPLL0_VOTE>;
clock-names = "pll", "aux";
#clock-cells = <0>;
clock-output-names = "a53mux_cci";
};
apcs1: mailbox@b011000 {
compatible = "qcom,msm8916-apcs-kpss-global", "syscon";
reg = <0xb011000 0x1000>;
#mbox-cells = <1>;
clocks = <&a53pll_c1>, <&gcc GPLL0_VOTE>;
clock-names = "pll", "aux";
#clock-cells = <0>;
clock-output-names = "a53mux_c1";
};
apcs0: mailbox@b111000 {
compatible = "qcom,msm8916-apcs-kpss-global", "syscon";
reg = <0xb111000 0x1000>;
#mbox-cells = <1>;
clocks = <&a53pll_c0>, <&gcc GPLL0_VOTE>;
clock-names = "pll", "aux";
#clock-cells = <0>;
clock-output-names = "a53mux_c0";
};
Shawn
