linux-kernel - RE: [PATCH v12 5/9] clk: Add Sunplus SP7021 clock driver

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Message-ID: <1af581687f424316b8759c65997694db@cqplus1.com>
Date:   Sat, 2 Apr 2022 03:37:22 +0000
From:   qinjian[覃健] <qinjian@...lus1.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen Boyd" <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Russell King - ARM Linux" <linux@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: RE: [PATCH v12 5/9] clk: Add Sunplus SP7021 clock driver

> 
> > > > +       /* This memory region include multi HW regs in discontinuous order.
> > > > +        * clk driver used some discontinuous areas in the memory region.
> > > > +        * Using devm_platform_ioremap_resource() would conflicted with other drivers.
> > > > +        */
> > > > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > > +       sp_clk_base = devm_ioremap(dev, res->start, resource_size(res));
> > > > +       if (!sp_clk_base)
> > > > +               return -ENXIO;
> > >
> > > Can you explain this comment in more detail? Generally, the 'reg' properties
> > > of drivers should not overlap, so it is supposed to be safe to call
> > > devm_platform_ioremap_resource() here.
> > >
> > > We discussed this in the context of the iop driver that did have overlapping
> > > registers with this driver, and that was incorrect. Are there any other drivers
> > > that conflict with the clk driver?
> >
> > I means, I must split up the origin reg region into 4 small pieces,
> > and call devm_platform_ioremap_resource() 4 times.
> > Did I should follow this way?
> 
> It depends. What are those other registers, and what drivers use them?
> 
>         Arnd

Include Reset / PinMux / USBC / UPHY regs, which used by related drivers.