linux-kernel - Re: [PATCH v4 3/3] arm64: dts: ti: k3-am69-sk: Add phase tags marking

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Date:   Fri, 11 Aug 2023 13:12:22 -0500
From:   Nishanth Menon <nm@...com>
To:     "Kumar, Udit" <u-kumar1@...com>
CC:     Apurva Nandan <a-nandan@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Hari Nagalla <hnagalla@...com>,
        Dasnavis Sabiya <sabiya.d@...tralsolutions.com>
Subject: Re: [PATCH v4 3/3] arm64: dts: ti: k3-am69-sk: Add phase tags marking

On 23:35-20230811, Kumar, Udit wrote:
> 
> On 8/11/2023 11:24 PM, Nishanth Menon wrote:
> > On 23:05-20230811, Kumar, Udit wrote:
> > > Hi Apurva
> > > 
> > > On 8/11/2023 8:46 PM, Apurva Nandan wrote:
> > > > bootph-all as phase tag was added to dt-schema
> > > > (dtschema/schemas/bootph.yaml) to cover U-Boot challenges with DT.
> > > > That's why add it also to Linux to be aligned with bootloader requirement.
> > > > 
> > > > wkup_uart0, wkup_i2c0, mcu_uart0, main_uart8, main_sdhci0 and main_sdhci1
> > > > are required for bootloader operation on TI K3 AM69-SK EVM. These IPs
> > > > along with pinmuxes need to be marked for all bootloader phases, hence add
> > > > bootph-all to these nodes in kernel dts.
> > > > 
> > > > Signed-off-by: Apurva Nandan <a-nandan@...com>
> > > > ---
> > > > [...]
> > > >    &wkup_uart0 {
> > > > +	bootph-all;
> > > >    	/* Firmware usage */
> > > >    	status = "reserved";
> > > >    	pinctrl-names = "default";
> > > I am not sure, if you want to treat wkup_uart in same way as you are
> > > treating secure_proxy_mcu in patch 1 of this series.
> > You should'nt. wkup_uart0 or what ever peripherals are specifically
> > board dependent. This patch does it the right way. I do have other
> > platforms on other K3 SoCs where the TIFS uart logs are actually
> > disabled.
> 
> Sorry, if i was not clear in my previous response.
> 
> This node is marked as reserved, adding bootph is not adding any value.
> 
> We can drop bootph from this node here.


Aah - yes. makes sense. Thanks for catching this. reserved nodes dont
make sense to have bootph in kernel dts. zephyr or u-boot r5 view will
probably enable them, and they should call it out.

> 
> > > IMO, where we are making this node status is okay, mark booth-all at that
> > > place only.
> > > 
> > > Otherwise for rest of series
> > > 
> > > LGTM
> > Do i take that as a Reviewed-by: for the series?
> 
> 
> With above change,
> 
> Reviewed-by: Udit Kumar <u-kumar1@...com>
> 
> > > 
> > [...]
> > 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D