linux-kernel - RE: [PATCH v3 1/2] dt-bindings: edac: Add cadence ddr mc support

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Date:   Wed, 15 Apr 2020 14:54:00 +0000
From:   Dhananjay Vilasrao Kangude <dkangude@...ence.com>
To:     Rob Herring <robh@...nel.org>
CC:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "james.morse@....com" <james.morse@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Milind Parab <mparab@...ence.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v3 1/2] dt-bindings: edac: Add cadence ddr mc support



> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Wednesday, April 15, 2020 5:20 AM
> To: Dhananjay Vilasrao Kangude <dkangude@...ence.com>
> Cc: linux-edac@...r.kernel.org; bp@...en8.de; mchehab@...nel.org;
> tony.luck@...el.com; james.morse@....com; linux-kernel@...r.kernel.org;
> Milind Parab <mparab@...ence.com>; devicetree@...r.kernel.org
> Subject: Re: [PATCH v3 1/2] dt-bindings: edac: Add cadence ddr mc support
> 
> EXTERNAL MAIL
> 
> 
> On Mon, Apr 06, 2020 at 03:13:40PM +0200, Dhananjay Kangude wrote:
> > Add documentation for cadence ddr memory controller EDAC DTS bindings
> >
> > Signed-off-by: Dhananjay Kangude <dkangude@...ence.com>
> > ---
> >  .../devicetree/bindings/edac/cdns,ddr-edac.yaml    |   47
> ++++++++++++++++++++
> >  1 files changed, 47 insertions(+), 0 deletions(-)  create mode 100644
> > Documentation/devicetree/bindings/edac/cdns,ddr-edac.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/edac/cdns,ddr-edac.yaml
> > b/Documentation/devicetree/bindings/edac/cdns,ddr-edac.yaml
> > new file mode 100644
> > index 0000000..30ea757
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/edac/cdns,ddr-edac.yaml
> > @@ -0,0 +1,47 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) %YAML 1.2
> > +---
> > +$id:
> > +https://urldefense.com/v3/__http://devicetree.org/schemas/edac/cdns,d
> > +dr-
> edac.yaml*__;Iw!!EHscmS1ygiU1lA!T49K56JzhGnA7nxu4mq55aDfl80QsXPj-l
> > +Egtf_PILMzq2Np6NqhLRXeTNuBLx0$
> > +$schema:
> > +https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.y
> > +aml*__;Iw!!EHscmS1ygiU1lA!T49K56JzhGnA7nxu4mq55aDfl80QsXPj-
> lEgtf_PILM
> > +zq2Np6NqhLRXe69d40qY$
> > +
> > +title: Cadence DDR IP with ECC support (EDAC)
> > +
> > +description:
> > +  This binding describes the Cadence DDR/LPDDR IP with ECC feature
> > +enabled
> > +  to detect and correct CE/UE errors.
> > +
> > +maintainers:
> > +  - Dhananjay Kangdue <dkangude@...ence.com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - cdns,ddr4-mc
> 
> Surely there's more than 1 version?

[Dhananjay Kangude] No, as of now we have only one version of hardware module. 
I will change the property with items instead of enum.
> 
> > +
> > +  reg:
> > +    minItems: 1
> > +    maxItems: 2
> > +    items:
> > +      - description:
> > +          Register block of DDR/LPDDR apb registers up to mapped area.
> > +          Mapped area contains the register set for memory controller,
> > +          phy and PI module register set doesn't part of this mapping.
> 
> doesn't part of this mapping?
> 
[Dhananjay Kangude] In case of combo IP, controller and phy module are together. 
But ecc doesn't have any dependencies on phy module so we can exclude phy module .
> Need a description for the 2nd region.

[Dhananjay Kangude] Removed maxItems property. We don't have another region to access.
fix will release in next version
> 
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    edac: edac@...00000 {
> 
> memory-controller@
[Dhananjay Kangude] ] memory-controller might not the appropriate name. 
the driver module is only focused on ecc not on actual memory-controller functionality.
> 
> > +        compatible = "cdns,ddr4-mc-edac";
> 
> Doesn't match.
[Dhananjay Kangude] fixed. Changes will be part of next version.
> 
> > +        reg = <0xfd100000 0x4000>;
> > +        interrupts = <0x00 0x01 0x04>;
> > +    };
> > +...
> > --
> > 1.7.1
> >