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Date: Sun, 28 Apr 2013 19:12:28 +0530
From: Bibek Basu <bbasu@...dia.com>
To: Thierry Reding <thierry.reding@...onic-design.de>
CC: "Rafael J. Wysocki" <rjw@...k.pl>,
"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"swarren@...dotorg.org" <swarren@...dotorg.org>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: RE: [PATCH 2/2] ARM: DT: tegra: pinctrl suspend resume hook
> -----Original Message-----
> From: Thierry Reding [mailto:thierry.reding@...onic-design.de]
> Sent: Saturday, April 27, 2013 1:19 AM
> To: Bibek Basu
> Cc: Rafael J. Wysocki; linus.walleij@...aro.org; swarren@...dotorg.org;
> linux-tegra@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> pm@...r.kernel.org
> Subject: Re: [PATCH 2/2] ARM: DT: tegra: pinctrl suspend resume hook
>
> * PGP Signed by an unknown key
>
> On Tue, Apr 23, 2013 at 11:39:02PM +0530, Bibek Basu wrote:
> > Make pinmux as the first node of tegra DT so as to achieve pinctrl as
> > last device to suspend and first device to resume.
>
> I don't think this is a good idea. For one it encodes Linux specific
> implementation details within the device tree. Furthermore I seem to
> remember that the device tree makes no guarantees that the order of nodes
> in the blob is the same as the order in the DTS.
>
> That said I don't have a good alternative. Perhaps one solution would be to
> use suspend_late() and resume_early() for the pinmux driver since they will
> be called after and before the suspend() and resume() callbacks of all other
> devices, respectively. Other than that I wasn't able to find anything about
> forcing a particular order during suspend and resume.
>
> Cc'ing Rafael and the linux-pm mailing list, maybe somebody among them
> knows a proper solution.
>
Stephen actually suggested me earlier to add dummy pinmux state on all dependent devices node. And that will make sure that dependency of driver prevails.
I tried that but I was not getting the desired result.
Can anyone tell me correct syntax for adding dummy state?
Regards
Bibek
> Thierry
>
> >
> > Signed-off-by: Bibek Basu <bbasu@...dia.com>
> > ---
> > arch/arm/boot/dts/tegra114.dtsi | 12 ++++++------
> > arch/arm/boot/dts/tegra20.dtsi | 16 ++++++++--------
> > arch/arm/boot/dts/tegra30.dtsi | 13 +++++++------
> > 3 files changed, 21 insertions(+), 20 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/tegra114.dtsi
> > b/arch/arm/boot/dts/tegra114.dtsi index a58a761..36596ae 100644
> > --- a/arch/arm/boot/dts/tegra114.dtsi
> > +++ b/arch/arm/boot/dts/tegra114.dtsi
> > @@ -11,6 +11,12 @@
> > serial3 = &uartd;
> > };
> >
> > + pinmux: pinmux {
> > + compatible = "nvidia,tegra114-pinmux";
> > + reg = <0x70000868 0x148 /* Pad control
> registers */
> > + 0x70003000 0x40c>; /* Mux registers */
> > + };
> > +
> > host1x {
> > compatible = "nvidia,tegra114-host1x", "simple-bus";
> > reg = <0x50000000 0x00028000>;
> > @@ -165,12 +171,6 @@
> > interrupt-controller;
> > };
> >
> > - pinmux: pinmux {
> > - compatible = "nvidia,tegra114-pinmux";
> > - reg = <0x70000868 0x148 /* Pad control
> registers */
> > - 0x70003000 0x40c>; /* Mux registers */
> > - };
> > -
> > /*
> > * There are two serial driver i.e. 8250 based simple serial
> > * driver and APB DMA based serial driver for higher baudrate diff
> > --git a/arch/arm/boot/dts/tegra20.dtsi
> > b/arch/arm/boot/dts/tegra20.dtsi index a5a9615..6d8a663 100644
> > --- a/arch/arm/boot/dts/tegra20.dtsi
> > +++ b/arch/arm/boot/dts/tegra20.dtsi
> > @@ -12,6 +12,14 @@
> > serial4 = &uarte;
> > };
> >
> > + pinmux: pinmux {
> > + compatible = "nvidia,tegra20-pinmux";
> > + reg = <0x70000014 0x10 /* Tri-state registers */
> > + 0x70000080 0x20 /* Mux registers */
> > + 0x700000a0 0x14 /* Pull-up/down registers */
> > + 0x70000868 0xa8>; /* Pad control registers */
> > + };
> > +
> > host1x {
> > compatible = "nvidia,tegra20-host1x", "simple-bus";
> > reg = <0x50000000 0x00024000>;
> > @@ -196,14 +204,6 @@
> > interrupt-controller;
> > };
> >
> > - pinmux: pinmux {
> > - compatible = "nvidia,tegra20-pinmux";
> > - reg = <0x70000014 0x10 /* Tri-state registers */
> > - 0x70000080 0x20 /* Mux registers */
> > - 0x700000a0 0x14 /* Pull-up/down registers */
> > - 0x70000868 0xa8>; /* Pad control registers */
> > - };
> > -
> > das {
> > compatible = "nvidia,tegra20-das";
> > reg = <0x70000c00 0x80>;
> > diff --git a/arch/arm/boot/dts/tegra30.dtsi
> > b/arch/arm/boot/dts/tegra30.dtsi index 9f33086..b4b79f0 100644
> > --- a/arch/arm/boot/dts/tegra30.dtsi
> > +++ b/arch/arm/boot/dts/tegra30.dtsi
> > @@ -12,6 +12,13 @@
> > serial4 = &uarte;
> > };
> >
> > + pinmux: pinmux {
> > + compatible = "nvidia,tegra30-pinmux";
> > + reg = <0x70000868 0xd4 /* Pad control registers */
> > + 0x70003000 0x3e4>; /* Mux registers */
> > + };
> > +
> > +
> > host1x {
> > compatible = "nvidia,tegra30-host1x", "simple-bus";
> > reg = <0x50000000 0x00024000>;
> > @@ -216,12 +223,6 @@
> > interrupt-controller;
> > };
> >
> > - pinmux: pinmux {
> > - compatible = "nvidia,tegra30-pinmux";
> > - reg = <0x70000868 0xd4 /* Pad control registers */
> > - 0x70003000 0x3e4>; /* Mux registers */
> > - };
> > -
> > /*
> > * There are two serial driver i.e. 8250 based simple serial
> > * driver and APB DMA based serial driver for higher baudrate
> > --
> > 1.8.1.5
> >
> > --
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> >
> >
>
> * Unknown Key
> * 0x7F3EB3A1
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