linux-kernel - Re: [PATCH v5] arm64: dts: ti: k3-j784s4-main: Fix mux-reg-masks in serdes_ln

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Date: Fri, 16 Feb 2024 10:26:01 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Peter Rosin <peda@...ntia.se>, Andrew Davis <afd@...com>
CC: Siddharth Vadapalli <s-vadapalli@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <gregkh@...uxfoundation.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <c-vankar@...com>, <srk@...com>
Subject: Re: [PATCH v5] arm64: dts: ti: k3-j784s4-main: Fix mux-reg-masks in
 serdes_ln_ctrl

On 24/02/13 11:08AM, Andrew Davis wrote:
> On 2/13/24 3:19 AM, Peter Rosin wrote:
> > Hi!
> > 
> > 2024-02-13 at 09:03, Siddharth Vadapalli wrote:
> > > From: Chintan Vankar <c-vankar@...com>
> > > 
> > > Change offset in mux-reg-masks property for serdes_ln_ctrl node
> > > since reg-mux property is used in compatible.
> > > 
> > > Fixes: 2765149273f4 ("mux: mmio: use reg property when parent device is not a syscon")
> > > Signed-off-by: Chintan Vankar <c-vankar@...com>
> > > Acked-by: Andrew Davis <afd@...com>
> > > Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> > > ---
..

> > > +			mux-reg-masks = <0x0 0x3>, <0x4 0x3>, /* SERDES0 lane0/1 select */
> > > +					<0x8 0x3>, <0xc 0x3>, /* SERDES0 lane2/3 select */
> > > +					<0x10 0x3>, <0x14 0x3>, /* SERDES1 lane0/1 select */
> > > +					<0x18 0x3>, <0x1c 0x3>, /* SERDES1 lane2/3 select */
> > > +					<0x20 0x3>, <0x24 0x3>, /* SERDES2 lane0/1 select */
> > > +					<0x28 0x3>, <0x2c 0x3>; /* SERDES2 lane2/3 select */
> > >   			idle-states = <J784S4_SERDES0_LANE0_PCIE1_LANE0>,
> > >   				      <J784S4_SERDES0_LANE1_PCIE1_LANE1>,
> > >   				      <J784S4_SERDES0_LANE2_IP3_UNUSED>,
> > 
> > Ouch. I suspect there is a similar problem in
> > arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi:
> > 
> > 
> > 	fss: bus@...00000 {
> > 		compatible = "simple-bus";
> > 		reg = <0x0 0x47000000 0x0 0x100>;
> > 		#address-cells = <2>;
> > 		#size-cells = <2>;
> > 		ranges;
> > 
> > 		hbmc_mux: mux-controller@...00004 {
> > 			compatible = "reg-mux";
> > 			reg = <0x00 0x47000004 0x00 0x2>;
> > 			#mux-control-cells = <1>;
> > -			mux-reg-masks = <0x4 0x2>; /* HBMC select */
> > +			mux-reg-masks = <0x0 0x2>; /* HBMC select */
> > 		};
> > 
> > Who knows what non-upstreamed devices and devicetrees are affected?
> > I guess we need to revert 2765149273f4 ("mux: mmio: use reg property
> > when parent device is not a syscon") unless someone sees a sane way
> > to fix this.
> 
> There are only two in-tree nodes with "reg-mux" with a reg property: the
> one this patch fixes, and the hbmc_mux you point out, both in TI devices.
> I'd say it is safe to assume we are the only users, and our non-upstreamed
> DTs depend on that patch, reverting it would cause more issues for
> out-of-tree users than just fixing the two broken nodes above.

Peter,

Is it alright for this patch to be merged, given Andrew's response above?
The problem with "hbmc_mux" node that you pointed out above could be fixed
by another patch. Please let me know.

Regards,
Siddharth.