linux-kernel - Re: [PATCH 6/9] arm64: dts: rockchip: add missing rk3568 cru phandles

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Date:   Wed, 28 Jul 2021 19:28:15 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Peter Geis <pgwipeout@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree@...r.kernel.org,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/9] arm64: dts: rockchip: add missing rk3568 cru phandles

Am Mittwoch, 28. Juli 2021, 18:49:47 CEST schrieb Peter Geis:
> On Wed, Jul 28, 2021 at 11:16 AM Peter Geis <pgwipeout@...il.com> wrote:
> >
> > On Wed, Jul 28, 2021 at 10:41 AM Heiko Stübner <heiko@...ech.de> wrote:
> > >
> > > Am Mittwoch, 28. Juli 2021, 16:18:49 CEST schrieb Peter Geis:
> > > > On Wed, Jul 28, 2021 at 10:06 AM Heiko Stübner <heiko@...ech.de> wrote:
> > > > >
> > > > > Hi Peter,
> > > > >
> > > > > Am Mittwoch, 28. Juli 2021, 15:55:31 CEST schrieb Peter Geis:
> > > > > > The grf and pmugrf phandles are necessary for the pmucru and cru to
> > > > > > modify clocks. Add these phandles to permit adjusting the clock rates
> > > > > > and muxes.
> > > > > >
> > > > > > Signed-off-by: Peter Geis <pgwipeout@...il.com>
> > > > > > ---
> > > > > >  arch/arm64/boot/dts/rockchip/rk356x.dtsi | 3 +++
> > > > > >  1 file changed, 3 insertions(+)
> > > > > >
> > > > > > diff --git a/arch/arm64/boot/dts/rockchip/rk356x.dtsi b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> > > > > > index 0905fac0726a..8ba0516eedd8 100644
> > > > > > --- a/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> > > > > > +++ b/arch/arm64/boot/dts/rockchip/rk356x.dtsi
> > > > > > @@ -218,6 +218,8 @@ grf: syscon@...60000 {
> > > > > >       pmucru: clock-controller@...00000 {
> > > > > >               compatible = "rockchip,rk3568-pmucru";
> > > > > >               reg = <0x0 0xfdd00000 0x0 0x1000>;
> > > > > > +             rockchip,grf = <&grf>;
> > > > > > +             rockchip,pmugrf = <&pmugrf>;
> > > > >
> > > > > I don't think the pmucru needs both and in fact the mainline
> > > > > clock driver should just reference its specific grf at all, i.e.
> > > > >         pmucru -> pmugrf (via the rockchip,grf handle)
> > > > >         cru -> grf
> > > > >
> > > > > I've not seen anything breaking this scope so far.
> > > >
> > > > I thought the same thing as well, but for some reason the driver
> > > > refuses to apply assigned-clocks to the plls unless these are all
> > > > present.
> > > > If the driver can get these assignments automatically eventually,
> > > > perhaps it's a loading order issue?
> > > >
> > > > Thinking about it, it's probably the grf and pmugrf haven't probed
> > > > when the driver is attempting to assign these, and tying them together
> > > > forces the probe to happen first.
> > >
> > > though nothing references the regular grf from the pmucru I think.
> > >
> > > I.e. the pmucru PLL read their lock state from RK3568_PMU_MODE_CON
> > >
> > > The rk3568 reuses the pll_rk3328-type which in turn is a modified pll_rk3036
> > > and uses their ops. Which in turn means the pll shouldn't access the GRF at
> > > all, as it uses the pll's own register to check the locked state.
> > >
> > > Can you try to change clk-pll.c from
> > >
> > >         switch (pll_type) {
> > >         case pll_rk3036:
> > >         case pll_rk3328:
> > >                 if (!pll->rate_table || IS_ERR(ctx->grf))
> > >                         init.ops = &rockchip_rk3036_pll_clk_norate_ops;
> > > ...
> > > to
> > >         switch (pll_type) {
> > >         case pll_rk3036:
> > >         case pll_rk3328:
> > >                 if (!pll->rate_table)
> > >                         init.ops = &rockchip_rk3036_pll_clk_norate_ops;
> > >
> > > similar to rk3399?
> >
> > Thanks, I'll test this!
> 
> Confirmed this fixed the issue for the rk3566, so as long as it
> doesn't break rk3328 this works.

It doesn't break anything ... i.e. the change for rk3328/rk3036 plls
from using the grf register to using the pll-internal lock status is in
the kernel for quite a while now - januar 2020 to be exact, and nobody
complained - including me when testing in my boardfarm ;-)

> I'll include the patch in the next series.
> 
> >
> > >
> > > Heiko
> > >
> > > > > >               #clock-cells = <1>;
> > > > > >               #reset-cells = <1>;
> > > > > >       };
> > > > > > @@ -225,6 +227,7 @@ pmucru: clock-controller@...00000 {
> > > > > >       cru: clock-controller@...20000 {
> > > > > >               compatible = "rockchip,rk3568-cru";
> > > > > >               reg = <0x0 0xfdd20000 0x0 0x1000>;
> > > > > > +             rockchip,grf = <&grf>;
> > > > > >               #clock-cells = <1>;
> > > > > >               #reset-cells = <1>;
> > > > > >       };
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> > >
> > >
>