linux-kernel - Re: [RFC PATCH v2 00/11] clk: imx8mn: setup clocks from the device tree

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Date:   Wed, 4 Jan 2023 17:09:07 +0100
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     Marek Vasut <marex@...x.de>
Cc:     linux-kernel@...r.kernel.org, angelo@...rulasolutions.com,
        michael@...rulasolutions.com, tommaso.merciai@...rulasolutions.com,
        Chen-Yu Tsai <wenst@...omium.org>,
        linux-amarula@...rulasolutions.com, anthony@...rulasolutions.com,
        jagan@...rulasolutions.com, Abel Vesa <abelvesa@...nel.org>,
        Adam Ford <aford173@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Li Jun <jun.li@....com>, Lucas Stach <l.stach@...gutronix.de>,
        Markus Niebel <Markus.Niebel@...tq-group.com>,
        Michael Turquette <mturquette@...libre.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: Re: [RFC PATCH v2 00/11] clk: imx8mn: setup clocks from the device tree

Hi Marek,

On Tue, Jan 3, 2023 at 12:04 AM Marek Vasut <marex@...x.de> wrote:
>
> On 1/1/23 18:57, Dario Binacchi wrote:
> > The idea for this series was born back from Dublin (ELCE 2022) after
> > having attended the talk entitled "Updating and Modernizing Clock
> > Drivers" held by Chen-Yu Tsai and the availability of a board with
> > imx8mn SOC.
> >
> > This series aims to setup all imx8mn's clocks from the device tree and
> > remove the legacy setup code with hardwired parameters.
> >
> > I am well aware that the series lacks patches for the DT bindings. The
> > effort up to this point has been important and so I thought I'd ask for
> > feedback from the community before proceeding to implement them. If it
> > is positive I will add the DT binding patches starting from version 2.
> >
> > The series has been tested on the BSH SystemMaster (SMM) S2 board:
> > https://www.apertis.org/reference_hardware/imx8mn_bsh_smm_s2pro_setup
>
> I might be wrong, but I vaguely recall AT91 (?) had this kind of massive
> clock tree description in DT and they then switched to much simpler
> clock description where the clock topology is encoded in the driver
> instead (like what iMX does right now). It might be worth having a look
> at that and the reasoning around that conversion.

I took inspiration from Tero Kristo's work on the clock subsystem for
TI platforms.
I think he did a great job in both device tree definition and driver
implementation.
IMHO, this way the drivers are more flexible and the code can be more easily
re-used on more platforms.

Thanks and regards,
Dario

-- 

Dario Binacchi

Senior Embedded Linux Developer

dario.binacchi@...rulasolutions.com

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