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

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Message-ID: <ZeKHSEcQ4h0nk8qb@linux-8mug>
Date: Sat, 2 Mar 2024 09:56:24 +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

On Mon, Feb 26, 2024 at 08:29:31AM +0200, Ghennadi Procopciuc wrote:
> On 2/24/24 12:44, Chester Lin wrote:
> > Hi Ghennadi,
> > 
> > On Sat, Feb 24, 2024 at 04:22:30PM +0800, Chester Lin wrote:
> >> Hi Ghennadi,
> 
> Hi Chester,
> >>
> >> 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/
> > 
> Indeed, I switched to raw clocks instead of placing them into a binding
> header after receiving this feedback on v1.
> 
> > 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.
> 
> These clock IDs will become immutable in the downstream version of TF-A
> once the patches get merged. This will prevent any unfortunate events
> when the Kernel and TF-A are not in sync with regard to SCMI clock IDs.
> 
> Best regards,
> Ghennadi

Thanks for explanation.

Reviewed-by: Chester Lin <chester62515@...il.com>

> > 
> > 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
> >>>
> 
> -- 
> Regards,
> Ghennadi
>