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Date: Fri, 15 Jul 2022 19:35:01 +0000
From: Frank Li <frank.li@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"maz@...nel.org" <maz@...nel.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"kw@...ux.com" <kw@...ux.com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
Peng Fan <peng.fan@....com>,
Aisheng Dong <aisheng.dong@....com>,
"jdmason@...zu.us" <jdmason@...zu.us>
CC: "kernel@...gutronix.de" <kernel@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
dl-linux-imx <linux-imx@....com>,
"kishon@...com" <kishon@...com>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"ntb@...ts.linux.dev" <ntb@...ts.linux.dev>
Subject: RE: [EXT] Re: [PATCH 2/3] dt-bindings: irqchip: imx mu work as msi
controller
> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Tuesday, July 12, 2022 5:26 AM
> To: Frank Li <frank.li@....com>; tglx@...utronix.de; maz@...nel.org;
> robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kw@...ux.com;
> bhelgaas@...gle.com; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> pci@...r.kernel.org; Peng Fan <peng.fan@....com>; Aisheng Dong
> <aisheng.dong@....com>; jdmason@...zu.us
> Cc: kernel@...gutronix.de; festevam@...il.com; dl-linux-imx <linux-
> imx@....com>; kishon@...com; lorenzo.pieralisi@....com;
> ntb@...ts.linux.dev
> Subject: [EXT] Re: [PATCH 2/3] dt-bindings: irqchip: imx mu work as msi
> controller
>
> Caution: EXT Email
>
> On 07/07/2022 23:02, Frank Li wrote:
> > imx mu support generate irq by write a register.
> > provide msi controller support so other driver
> > can use it by standard msi interface.
> >
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> > .../interrupt-controller/fsl,mu-msi.yaml | 94 +++++++++++++++++++
> > 1 file changed, 94 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/interrupt-
> controller/fsl,mu-msi.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-
> msi.yaml b/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-
> msi.yaml
> > new file mode 100644
> > index 0000000000000..b4ac583f60227
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,mu-
> msi.yaml
> > @@ -0,0 +1,94 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id:
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicet
> ree.org%2Fschemas%2Finterrupt-controller%2Ffsl%2Cmu-
> msi.yaml%23&data=05%7C01%7CFrank.Li%40nxp.com%7C1f7d0921308
> 74d4a52d808da63f0e9db%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C
> 0%7C637932183637319092%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wL
> jAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%
> 7C%7C&sdata=eA4wrkb39C4NFpLcpvMdFfqEBxcikyTOGaBthf61tjI%3D&
> amp;reserved=0
> > +$schema:
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicet
> ree.org%2Fmeta-
> schemas%2Fcore.yaml%23&data=05%7C01%7CFrank.Li%40nxp.com%7
> C1f7d092130874d4a52d808da63f0e9db%7C686ea1d3bc2b4c6fa92cd99c5c30
> 1635%7C0%7C0%7C637932183637319092%7CUnknown%7CTWFpbGZsb3d8e
> yJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D
> %7C3000%7C%7C%7C&sdata=ke6K1nzmgNXh%2FkyEh6UP%2F0VZ4C17
> GuhnqZTX4WeB4kY%3D&reserved=0
> > +
> > +title: NXP i.MX Messaging Unit (MU)
> > +
> > +maintainers:
> > + - Frank Li <Frank.Li@....com>
> > +
> > +description: |
> > + The Messaging Unit module enables two processors within the SoC to
> > + communicate and coordinate by passing messages (e.g. data, status
> > + and control) through the MU interface. The MU also provides the ability
> > + for one processor to signal the other processor using interrupts.
> > +
> > + Because the MU manages the messaging between processors, the MU
> uses
> > + different clocks (from each side of the different peripheral buses).
> > + Therefore, the MU must synchronize the accesses from one side to the
> > + other. The MU accomplishes synchronization using two sets of matching
> > + registers (Processor A-facing, Processor B-facing).
> > +
> > + MU can work as msi interrupt controller to do doorbell
> > +
> > +properties:
> > + compatible:
> > + oneOf:
> > + - const: fsl,imx6sx-mu-msi
> > + - const: fsl,imx7ulp-mu-msi
> > + - const: fsl,imx8ulp-mu-msi
> > + - const: fsl,imx8-mu-msi
> > + - const: fsl,imx8ulp-mu-msi-s4
>
> Use enum
>
> > + - items:
> > + - const: fsl,imx8ulp-mu-msi
>
> Single item... why?
>
> > + - items:
> > + - enum:
> > + - fsl,imx7s-mu-msi
> > + - fsl,imx8mq-mu-msi
> > + - fsl,imx8mm-mu-msi
> > + - fsl,imx8mn-mu-msi
> > + - fsl,imx8mp-mu-msi
> > + - fsl,imx8qm-mu-msi
>
> Why qm is here not compatible with qxp? It's already mentioned in
> section below.
>
> > + - fsl,imx8qxp-mu-msi
> > + - const: fsl,imx6sx-mu-msi
> > + - description: MU work as msi controller
> > + items:
> > + - enum:
> > + - fsl,imx8qm-mu-msi
> > + - fsl,imx8qxp-mu-msi
> > + - const: fsl,imx6sx-mu-msi
> > + reg:
> > + maxItems: 2
> > +
> > + interrupts:
> > + minItems: 1
> > + maxItems: 2
>
> Instead describe the items.
>
> > +
> > + interrupt-names:
> > + minItems: 1
> > + items:
> > + - const: tx
> > + - const: rx
> > +
> > + clocks:
> > + maxItems: 1
> > +
> > + power-domains:
> > + maxItems: 1
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - msi-controller
>
> How this end up here?
>
> Aren't you missing allOf with a reference to msi-controller?
>
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > + lsio_mu12: msi@...70000 {
> > + compatible = "fsl,imx6sx-mu-msi-db";
>
> ???
>
> > + msi-controller;
> > + interrupt-controller;
>
> ??? How this appeared here
>
> Also fix your indentation like in example-schema.
>
> > + reg = <0x5d270000 0x10000>, /* A side */
> > + <0x5d300000 0x10000>; /* B side */
> > + reg-names = "a", "b";
> > + interrupts = <GIC_SPI 191 IRQ_TYPE_LEVEL_HIGH>;
> > + power-domains = <&pd IMX_SC_R_MU_12A>,
> > + <&pd IMX_SC_R_MU_12B>;
>
> Please do not send untested bindings. It's a waste of our time.
>
> Really two items here? You just said only one is allowed.
>
> > + power-domain-names = "a", "b";
>
> Sorry, this patch looks really poor. a/b is not a descriptive name and
[Frank Li] MU spec said it is A-side and B-side. So I think "a" "b" is good
Enough here. I fixed most problem at v2.
PCI EP using MSI as door bell is quite new. I want check if the overall idea is good
Enough to go further.
> they are not allowed by your own bindings. Please perform some internal
> reviews...
>
> > + };
>
>
> Best regards,
> Krzysztof
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