linux-kernel - Re: [PATCH 1/3] arm64: dts: ti: Add GPMC NAND support

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Message-ID: <20230915122251.76uud4tmfzdvcala@preheated>
Date:   Fri, 15 Sep 2023 07:22:51 -0500
From:   Nishanth Menon <nm@...com>
To:     Nitin Yadav <n-yadav@...com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <vigneshr@...com>, <rogerq@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <catalin.marinas@....com>,
        <will@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] arm64: dts: ti: Add GPMC NAND support

On 14:53-20230915, Nitin Yadav wrote:
> 
> 
> On 14/09/23 21:34, Nishanth Menon wrote:
> > On 14:56-20230914, Nitin Yadav wrote:
> >> Hi Krzysztof,
> >>
> >> On 14/09/23 11:57, Krzysztof Kozlowski wrote:
> >>> On 13/09/2023 13:47, Nitin Yadav wrote:
> >>>> Add support for AM62Q NAND card: X8 NAND EXPANSION
> >>>> BOARD card (PROC143E1) for AM62x LP SK board.
> > 
> > Commit message is all too wrong as well. Sigh.
> > 
> >>>>
> >>>> Signed-off-by: Nitin Yadav <n-yadav@...com>
> >>>> ---
> >>>>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 29 ++++++++++++++++++++++++
> >>>>  arch/arm64/boot/dts/ti/k3-am62.dtsi      |  2 ++
> >>>>  2 files changed, 31 insertions(+)
> >>>>
> >>>> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> >>>> index 284b90c94da8..e93e79d8083f 100644
> >>>> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> >>>> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> >>>> @@ -955,4 +955,33 @@ mcasp2: audio-controller@...0000 {
> >>>>  		power-domains = <&k3_pds 192 TI_SCI_PD_EXCLUSIVE>;
> >>>>  		status = "disabled";
> >>>>  	};
> >>>> +	gpmc0: memory-controller@...00000 {
> >>>> +		status = "disabled";
> >>>
> >>> status is never first in DTSI. Really, where did you see such code?
> >> Thank for pointing out, Will send a revised version.
> > 
> > GPMC is not functional without board specific interface configuration
> > such as pinmux. this approach, in fact is all over the place now and
> > discussed in the mailing list multiple times now.
> > 
> > What is missing here is the documentation of the constraints as to why
> > it is set as disabled by default.

> gpmc nand is only am62x lp sk in am62x series. it has pinmux conflict
> with macsp1, so disabling gpmc & elm by default for other am62 series.
> For am62x lpsk in overlay macsp1 is disabled.


When introducing a patch for SoC dtsi - explain in commit message and
code comments from the SoC's perspective, not the specific board
perspective.

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