linux-kernel - Re: [PATCH v2 2/2] arm64: dts: s32g: add uSDHC node

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Date: Sat, 24 Feb 2024 18:44:55 +0800
From: Chester Lin <chester62515@...il.com>
To: Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>
Cc: Andreas Farber <afaerber@...e.de>, Matthias Brugger <mbrugger@...e.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, NXP S32 Linux Team <s32@....com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	NXP Linux Team <linux-imx@....com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	Ghennadi Procopciuc <ghennadi.procopciuc@....com>,
	Ciprian Costea <ciprianmarian.costea@....com>
Subject: Re: [PATCH v2 2/2] arm64: dts: s32g: add uSDHC node

Hi Ghennadi,

On Sat, Feb 24, 2024 at 04:22:30PM +0800, Chester Lin wrote:
> Hi Ghennadi,
> 
> On Mon, Jan 22, 2024 at 04:06:01PM +0200, Ghennadi Procopciuc wrote:
> > From: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
> > 
> > Add the uSDHC node for the boards that are based on S32G SoCs.
> > 
> > Signed-off-by: Ciprian Costea <ciprianmarian.costea@....com>
> > Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/s32g2.dtsi        | 10 ++++++++++
> >  arch/arm64/boot/dts/freescale/s32g274a-evb.dts  |  6 +++++-
> >  arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts |  6 +++++-
> >  3 files changed, 20 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/freescale/s32g2.dtsi b/arch/arm64/boot/dts/freescale/s32g2.dtsi
> > index ef1a1d61f2ba..fc19ae2e8d3b 100644
> > --- a/arch/arm64/boot/dts/freescale/s32g2.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/s32g2.dtsi
> > @@ -138,6 +138,16 @@ uart2: serial@...bc000 {
> >  			status = "disabled";
> >  		};
> >  
> > +		usdhc0: mmc@...f0000 {
> > +			compatible = "nxp,s32g2-usdhc";
> > +			reg = <0x402f0000 0x1000>;
> > +			interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
> > +			clocks = <&clks 32>, <&clks 31>, <&clks 33>;
> 
> Same as I have mentioned in [PATCH v2 1/2], could we have fixed dt-bindings to
> replace with these raw clock id values (32, 31, 33)?
> 

Just found the previous review discussion in v1:
https://lore.kernel.org/all/f54d947c-58dc-498f-8871-b472f97be4a8@oss.nxp.com/

What I'm worried is that, could these raw clock IDs be rearranged in the
downstream TF-A? If so it would cause ABI inconsistency and clock issues
since the kernel is not aware of any raw ID changes in downstream TF-A.

Chester

> > +			clock-names = "ipg", "ahb", "per";
> > +			bus-width = <8>;
> > +			status = "disabled";
> > +		};
> > +
> >  		gic: interrupt-controller@...00000 {
> >  			compatible = "arm,gic-v3";
> >  			reg = <0x50800000 0x10000>,
> > diff --git a/arch/arm64/boot/dts/freescale/s32g274a-evb.dts b/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
> > index 9118d8d2ee01..00070c949e2a 100644
> > --- a/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
> > +++ b/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
> > @@ -1,7 +1,7 @@
> >  // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
> >  /*
> >   * Copyright (c) 2021 SUSE LLC
> > - * Copyright (c) 2019-2021 NXP
> > + * Copyright 2019-2021, 2024 NXP
> >   */
> >  
> >  /dts-v1/;
> > @@ -32,3 +32,7 @@ memory@...00000 {
> >  &uart0 {
> >  	status = "okay";
> >  };
> > +
> > +&usdhc0 {
> > +	status = "okay";
> > +};
> > diff --git a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> > index e05ee854cdf5..b3fc12899cae 100644
> > --- a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> > +++ b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> > @@ -1,7 +1,7 @@
> >  // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
> >  /*
> >   * Copyright (c) 2021 SUSE LLC
> > - * Copyright (c) 2019-2021 NXP
> > + * Copyright 2019-2021, 2024 NXP
> >   */
> >  
> >  /dts-v1/;
> > @@ -38,3 +38,7 @@ &uart0 {
> >  &uart1 {
> >  	status = "okay";
> >  };
> > +
> > +&usdhc0 {
> > +	status = "okay";
> > +};
> > -- 
> > 2.43.0
> >