From: Leo Li <leoyang.li@nxp.com>
To: Biwen Li <biwen.li@nxp.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
Ran Wang <ran.wang_1@nxp.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: RE: [v3,3/3] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr-alt-addr' property
Date: Wed, 25 Sep 2019 03:26:08 +0000 [thread overview]
Message-ID: <AM0PR04MB66762594DDFC6E5B00BD103C8F870@AM0PR04MB6676.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <DB7PR04MB449034C4BBAA89685A2130F78F870@DB7PR04MB4490.eurprd04.prod.outlook.com>
> -----Original Message-----
> From: Biwen Li
> Sent: Tuesday, September 24, 2019 10:13 PM
> To: Leo Li <leoyang.li@nxp.com>; shawnguo@kernel.org;
> robh+dt@kernel.org; mark.rutland@arm.com; Ran Wang
> <ran.wang_1@nxp.com>
> Cc: linuxppc-dev@lists.ozlabs.org; linux-arm-kernel@lists.infradead.org;
> linux-kernel@vger.kernel.org; devicetree@vger.kernel.org
> Subject: RE: [v3,3/3] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr-alt-
> addr' property
>
> > >
> > > The 'fsl,ippdexpcr-alt-addr' property is used to handle an errata
> > > A-008646 on LS1021A
> > >
> > > Signed-off-by: Biwen Li <biwen.li@nxp.com>
> > > ---
> > > Change in v3:
> > > - rename property name
> > > fsl,rcpm-scfg -> fsl,ippdexpcr-alt-addr
> > >
> > > Change in v2:
> > > - update desc of the property 'fsl,rcpm-scfg'
> > >
> > > Documentation/devicetree/bindings/soc/fsl/rcpm.txt | 14
> > > ++++++++++++++
> > > 1 file changed, 14 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
> > > b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
> > > index 5a33619d881d..157dcf6da17c 100644
> > > --- a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
> > > +++ b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
> > > @@ -34,6 +34,11 @@ Chassis Version Example Chips
> > > Optional properties:
> > > - little-endian : RCPM register block is Little Endian. Without it RCPM
> > > will be Big Endian (default case).
> > > + - fsl,ippdexpcr-alt-addr : Must add the property for SoC LS1021A,
> >
> > You probably should mention this is related to a hardware issue on
> > LS1021a and only needed on LS1021a.
> Okay, got it, thanks, I will add this in v4.
> >
> > > + Must include n + 1 entries (n = #fsl,rcpm-wakeup-cells, such as:
> > > + #fsl,rcpm-wakeup-cells equal to 2, then must include 2 + 1 entries).
> >
> > #fsl,rcpm-wakeup-cells is the number of IPPDEXPCR registers on an SoC.
> > However you are defining an offset to scfg registers here. Why these
> > two are related? The length here should actually be related to the
> > #address-cells of the soc/. But since this is only needed for LS1021, you can
> just make it 3.
> I need set the value of IPPDEXPCR resgiters from ftm_alarm0 device
> node(fsl,rcpm-wakeup = <&rcpm 0x0 0x20000000>;
> 0x0 is a value for IPPDEXPCR0, 0x20000000 is a value for IPPDEXPCR1).
> But because of the hardware issue on LS1021A, I need store the value of
> IPPDEXPCR registers to an alt address. So I defining an offset to scfg registers,
> then RCPM driver get an abosolute address from offset, RCPM driver write
> the value of IPPDEXPCR registers to these abosolute addresses(backup the
> value of IPPDEXPCR registers).
I understand what you are trying to do. The problem is that the new fsl,ippdexpcr-alt-addr property contains a phandle and an offset. The size of it shouldn't be related to #fsl,rcpm-wakeup-cells.
> >
> > > + The first entry must be a link to the SCFG device node.
> > > + The non-first entry must be offset of registers of SCFG.
> > >
> > > Example:
> > > The RCPM node for T4240:
> > > @@ -43,6 +48,15 @@ The RCPM node for T4240:
> > > #fsl,rcpm-wakeup-cells = <2>;
> > > };
> > >
> > > +The RCPM node for LS1021A:
> > > + rcpm: rcpm@1ee2140 {
> > > + compatible = "fsl,ls1021a-rcpm", "fsl,qoriq-rcpm-2.1+";
> > > + reg = <0x0 0x1ee2140 0x0 0x8>;
> > > + #fsl,rcpm-wakeup-cells = <2>;
> > > + fsl,ippdexpcr-alt-addr = <&scfg 0x0 0x51c>; /*
> > > SCFG_SPARECR8 */
> > > + };
> > > +
> > > +
> > > * Freescale RCPM Wakeup Source Device Tree Bindings
> > > -------------------------------------------
> > > Required fsl,rcpm-wakeup property should be added to a device node
> > > if the device
> > > --
> > > 2.17.1
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next prev parent reply other threads:[~2019-09-25 3:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-24 2:45 [v3,1/3] soc: fsl: handle RCPM errata A-008646 on SoC LS1021A Biwen Li
2019-09-24 2:45 ` [v3, 2/3] arm: dts: ls1021a: fix that FlexTimer cannot wakeup system in deep sleep Biwen Li
2019-09-24 2:45 ` [v3, 3/3] Documentation: dt: binding: fsl: Add 'fsl, ippdexpcr-alt-addr' property Biwen Li
2019-09-24 15:58 ` [v3,3/3] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr-alt-addr' property Leo Li
2019-09-25 3:13 ` Biwen Li
2019-09-25 3:26 ` Leo Li [this message]
2019-09-25 3:30 ` Biwen Li
2019-09-25 3:34 ` Leo Li
2019-09-25 3:47 ` Biwen Li
2019-09-25 3:48 ` Leo Li
2019-09-25 4:06 ` Biwen Li
2019-09-25 4:21 ` Biwen Li
2019-09-25 14:07 ` [v3, 3/3] Documentation: dt: binding: fsl: Add 'fsl, ippdexpcr-alt-addr' property Li Yang
2019-09-26 1:54 ` [EXT] Re: [v3,3/3] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr-alt-addr' property Biwen Li
2019-09-27 18:28 ` Rob Herring
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