linux-kernel - Re: [PATCH 1/3] dt-bindings: clock: s32g: add uSDHC clock IDs

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Message-ID: <75a16ac3-39eb-4874-9100-d605b2cfadfc@oss.nxp.com>
Date: Fri, 19 Jan 2024 23:25:57 +0200
From: Ghennadi Procopciuc <ghennadi.procopciuc@....nxp.com>
To: Conor Dooley <conor@...nel.org>
Cc: Chester Lin <chester62515@...il.com>, 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 1/3] dt-bindings: clock: s32g: add uSDHC clock IDs

On 1/19/24 18:14, Conor Dooley wrote:
> On Fri, Jan 19, 2024 at 04:11:37PM +0000, Conor Dooley wrote:
>> On Fri, Jan 19, 2024 at 03:02:28PM +0200, Ghennadi Procopciuc (OSS) wrote:
>>> From: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
>>>
>>> Add the SCMI clock IDs for the uSDHC controller present on
>>> S32G SoCs.
>>>
>>> Signed-off-by: Ciprian Costea <ciprianmarian.costea@....com>
>>> Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@....com>
>>> ---
>>>  include/dt-bindings/clock/s32g-scmi-clock.h | 14 ++++++++++++++
>>>  1 file changed, 14 insertions(+)
>>>  create mode 100644 include/dt-bindings/clock/s32g-scmi-clock.h
>>>
>>> diff --git a/include/dt-bindings/clock/s32g-scmi-clock.h b/include/dt-bindings/clock/s32g-scmi-clock.h
>>> new file mode 100644
>>> index 000000000000..739f98a924c3
>>> --- /dev/null
>>> +++ b/include/dt-bindings/clock/s32g-scmi-clock.h
>>> @@ -0,0 +1,14 @@
>>> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
>>> +/*
>>> + * Copyright 2020-2024 NXP
>>> + */
>>> +#ifndef _DT_BINDINGS_SCMI_CLK_S32G_H
>>> +#define _DT_BINDINGS_SCMI_CLK_S32G_H
>>> +
>>> +/* uSDHC */
>>> +#define S32G_SCMI_CLK_USDHC_AHB		31
>>> +#define S32G_SCMI_CLK_USDHC_MODULE	32
>>> +#define S32G_SCMI_CLK_USDHC_CORE	33
>>> +#define S32G_SCMI_CLK_USDHC_MOD32K	34
>>
>> Why do these numbers not start at 0?
> 
> Ah, because these are the SCMI IDs directly. If these are numbers that
> are in the TRM, just use the numbers directly - there's no need to
> create bindings for that.
> 

Hi Conor,

I appreciate you taking the time to review the proposed changes. I
wanted to clarify that the IDs mentioned in the header are SCMI IDs
exported by the TF-A and are utilized by the second patch of this
series. These IDs are for the uSDHC controller to control its clocks. As
other SoCs use this model, I have included all the necessary IDs in a
dedicated header file:
- rk3588s     (arch/arm64/boot/dts/rockchip/rk3588s.dtsi:97 [0])
- stm32mp157c (arch/arm/boot/dts/st/stm32mp157c-ed1-scmi.dts:73 [1])
- stm32mp131  (arch/arm/boot/dts/st/stm32mp131.dtsi:1372 [2])

Should I remove the header and use raw numbers in the uSDHC node? For
example:
> +		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>;
> +			clock-names = "ipg", "ahb", "per";
> +			bus-width = <8>;
> +			status = "disabled";
> +		};

[0]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3588s.dtsi#n97
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/st/stm32mp157c-ed1-scmi.dts#n73
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/st/stm32mp131.dtsi#n1372

-- 
Regards,
Ghennadi