From: Stephen Boyd <sboyd@kernel.org>
To: Gregory CLEMENT <gregory.clement@bootlin.com>
Cc: "Mike Turquette" <mturquette@baylibre.com>,
"Stephen Boyd" <sboyd@codeaurora.org>,
linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
"Rob Herring" <robh+dt@kernel.org>,
"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
linux-arm-kernel@lists.infradead.org,
"Jason Cooper" <jason@lakedaemon.net>,
"Andrew Lunn" <andrew@lunn.ch>,
"Sebastian Hesselbarth" <sebastian.hesselbarth@gmail.com>,
"Antoine Tenart" <antoine.tenart@bootlin.com>,
"Miquèl Raynal" <miquel.raynal@bootlin.com>,
"Maxime Chevallier" <maxime.chevallier@bootlin.com>
Subject: Re: [PATCH 6/6] arm64: dts: marvell: Add cpu clock node on Armada 7K/8K
Date: Wed, 28 Nov 2018 14:03:47 -0800 [thread overview]
Message-ID: <154344262734.88331.5318941402726866903@swboyd.mtv.corp.google.com> (raw)
In-Reply-To: <87a7lzq1jz.fsf@bootlin.com>
Quoting Gregory CLEMENT (2018-11-23 07:02:56)
> Hi Stephen,
>
> On ven., oct. 12 2018, Stephen Boyd <sboyd@kernel.org> wrote:
>
> > +Rob
> >
> > Quoting Gregory CLEMENT (2018-09-22 11:17:09)
> >> diff --git a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
> >> index 4a65e4e830aa..27c840e91abe 100644
> >> --- a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
> >> +++ b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
> >> @@ -280,6 +280,12 @@
> >> #address-cells = <1>;
> >> #size-cells = <1>;
> >>
> >> + cpu_clk: clock-cpu {
> >> + compatible = "marvell,ap806-cpu-clock";
> >> + clocks = <&ap_clk 0>, <&ap_clk 1>;
> >> + #clock-cells = <1>;
> >> + };
> >
> > This looks like the wrong place because there isn't a reg property. It
>
> There is no reg property because we are inside a syscon node where the
> registers are shared between multiple IPs.
The node right after this node has a reg property. What's going on?
>
> > should go to the root of the tree. And then it looks like we're adding
> > something to DT to get a driver to probe, which is improper DT design.
>
> There is nothing related to the driver, this subnode describes the way
> the hardware is designed. Under the system controller node there are
> several IPs , like the CPU clocks, but also the GPIO or the pinctrl.
>
Ok. And some of them have reg properties and others don't? We should
somehow deprecate the idea of a syscon with child nodes. It leads to
this weird twisting of DT. The only use for syscon from my perspective
is when we have a register region that other random devices with their
own 'reg' property need to peek/poke random things into.
prev parent reply other threads:[~2018-11-28 22:03 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-22 18:17 [PATCH 0/6] Add CPU clock support for Armada 7K/8K Gregory CLEMENT
2018-09-22 18:17 ` [PATCH 1/6] dt-bindings: ap806: add the cluster clock node in the syscon file Gregory CLEMENT
2018-10-16 20:56 ` Stephen Boyd
2018-09-22 18:17 ` [PATCH 2/6] clk: mvebu: add helper file for Armada AP and CP clocks Gregory CLEMENT
2018-10-17 18:32 ` Stephen Boyd
2018-09-22 18:17 ` [PATCH 3/6] clk: mvebu: add CPU clock driver for Armada 7K/8K Gregory CLEMENT
2018-10-17 18:28 ` Stephen Boyd
2018-11-15 23:22 ` Gregory CLEMENT
2018-11-27 16:27 ` Gregory CLEMENT
2018-11-28 21:58 ` Stephen Boyd
2018-11-28 21:58 ` Stephen Boyd
2018-09-22 18:17 ` [PATCH 4/6] clk: mvebu: ap806: Fix clock name for the cluster Gregory CLEMENT
2018-10-17 18:28 ` Stephen Boyd
2018-11-23 14:42 ` Gregory CLEMENT
2018-11-28 22:00 ` Stephen Boyd
2018-09-22 18:17 ` [PATCH 5/6] arm64: marvell: enable the Armada 7K/8K CPU clk driver Gregory CLEMENT
2018-09-22 18:17 ` [PATCH 6/6] arm64: dts: marvell: Add cpu clock node on Armada 7K/8K Gregory CLEMENT
2018-10-12 17:42 ` Stephen Boyd
2018-11-23 15:02 ` Gregory CLEMENT
2018-11-28 22:03 ` Stephen Boyd [this message]
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