linux-kernel - Re: [PATCH v3 3/8] arm64: dts: ls1028a: add flextimer based pwm nodes

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Message-ID: <20220413182327.lbemqze46eq7ulfn@skbuf>
Date:   Wed, 13 Apr 2022 21:23:27 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Leo Li <leoyang.li@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Biwen Li <biwen.li@....com>
Subject: Re: [PATCH v3 3/8] arm64: dts: ls1028a: add flextimer based pwm nodes

On Wed, Apr 13, 2022 at 06:07:20PM +0000, Leo Li wrote:
> > arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi:1210.21-1219.5: Warning
> > (unique_unit_address): /soc/pwm@...0000: duplicate unit-address (also
> > used in node /soc/timer@...0000)
> > arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi:1221.21-1230.5: Warning
> > (unique_unit_address): /soc/pwm@...0000: duplicate unit-address (also
> > used in node /soc/timer@...0000)
> 
> Well, this is similar situation as pcie.  The flextimer controller can
> be used as timer, PWM or alarm.  We have separate drivers and bindings
> for these modes which resulted in different nodes for the same
> controller.

I think the mfd framework can address the situation where multiple
drivers, with multiple functionalities, want access to the same memory
region?