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

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Date:   Thu, 14 Sep 2023 11:04:50 -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 14:56-20230914, 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.


> > 
> >> +		compatible = "ti,am64-gpmc";
> >> +		power-domains = <&k3_pds 80 TI_SCI_PD_EXCLUSIVE>;
> > 
> > First is compatible, second is reg/reg-names/ranges.
> > 
> > 
> > Best regards,
> > Krzysztof
> > 
> 
> -- 
> Regards,
> Nitin

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