linux-kernel - RE: [PATCH v1 2/8] ARM: dts: aspeed: yosemite4: Add i2c-mux for four NICs

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Message-ID:
 <TYZPR04MB585305DCD18AF723B8A48480D6772@TYZPR04MB5853.apcprd04.prod.outlook.com>
Date: Tue, 1 Oct 2024 07:52:46 +0000
From: Delphine_CC_Chiu/WYHQ/Wiwynn <Delphine_CC_Chiu@...ynn.com>
To: Andrew Jeffery <andrew@...econstruct.com.au>, Delphine_CC_Chiu/WYHQ/Wiwynn
	<Delphine_CC_Chiu@...ynn.com>, "patrick@...cx.xyz" <patrick@...cx.xyz>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>
CC: Ricky CX Wu <ricky.cx.wu.wiwynn@...il.com>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-aspeed@...ts.ozlabs.org"
	<linux-aspeed@...ts.ozlabs.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 2/8] ARM: dts: aspeed: yosemite4: Add i2c-mux for four
 NICs



> -----Original Message-----
> From: Andrew Jeffery <andrew@...econstruct.com.au>
> Sent: Tuesday, October 1, 2024 8:37 AM
> To: Delphine_CC_Chiu/WYHQ/Wiwynn <Delphine_CC_Chiu@...ynn.com>;
> patrick@...cx.xyz; Rob Herring <robh@...nel.org>; Krzysztof Kozlowski
> <krzk+dt@...nel.org>; Conor Dooley <conor+dt@...nel.org>; Joel Stanley
> <joel@....id.au>
> Cc: Ricky CX Wu <ricky.cx.wu.wiwynn@...il.com>;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v1 2/8] ARM: dts: aspeed: yosemite4: Add i2c-mux for four
> NICs
> 
>  [External Sender]
> 
>  [External Sender]
> 
> On Mon, 2024-09-30 at 15:04 +0800, Delphine CC Chiu wrote:
> > From: Ricky CX Wu <ricky.cx.wu.wiwynn@...il.com>
> >
> > Add i2c-mux on Spider board for four NICs and add the temperature
> > sensor and EEPROM for the NICs.
> >
> > Signed-off-by: Ricky CX Wu <ricky.cx.wu.wiwynn@...il.com>
> > Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
> > ---
> >  .../aspeed/aspeed-bmc-facebook-yosemite4.dts  | 75
> > ++++++++++++++++++-
> >  1 file changed, 72 insertions(+), 3 deletions(-)
> >
> > diff --git
> > a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
> > b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
> > index dbc992a625b7..b813140b3c5b 100644
> > --- a/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
> > +++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-yosemite4.dts
> > @@ -26,6 +26,10 @@ aliases {
> >               i2c21 = &imux21;
> >               i2c22 = &imux22;
> >               i2c23 = &imux23;
> > +             i2c24 = &imux24;
> > +             i2c25 = &imux25;
> > +             i2c26 = &imux26;
> > +             i2c27 = &imux27;
> >               i2c34 = &imux34;
> >               i2c35 = &imux35;
> >       };
> > @@ -1196,8 +1200,9 @@ adc@35 {
> >  };
> >
> >  &i2c15 {
> > +     #address-cells = <1>;
> > +     #size-cells = <0>;
> >       status = "okay";
> > -     mctp-controller;
> 
> Why are you deleting this if you're not also deleting the MCTP endpoint node?
> 
> Unless there's some reason this is related to the NICs, this should be its own
> patch with its own justification.
> 
> Andrew
Hi Andrew,

We have discussed with Jeremy from Code Construct about removing the
mctp-controller on bus 15 before.

He thought it would be better to add the mctp-controller on each i2c mux port
so the MCTP driver would ensure that the mux was configured properly before
communicating with the device.

I'll split a patch to remove the mctp-controller on bus 15 in next serial of patches.

Regards,
Ricky