Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Wed, 13 Apr 2022 21:23:27 +0300
From:   Vladimir Oltean <olteanv@gmail.com>
To:     Leo Li <leoyang.li@nxp.com>
Cc:     Shawn Guo <shawnguo@kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Biwen Li <biwen.li@nxp.com>
Subject: Re: [PATCH v3 3/8] arm64: dts: ls1028a: add flextimer based pwm nodes
Message-ID: <20220413182327.lbemqze46eq7ulfn@skbuf>
References: <20211214093240.23320-1-leoyang.li@nxp.com>
 <20211214093240.23320-4-leoyang.li@nxp.com>
 <20220413163306.hp5qyxxgdlekczet@skbuf>
 <DU2PR04MB894984A336667EF01DF709988FEC9@DU2PR04MB8949.eurprd04.prod.outlook.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <DU2PR04MB894984A336667EF01DF709988FEC9@DU2PR04MB8949.eurprd04.prod.outlook.com>
Precedence: bulk

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@2800000: duplicate unit-address (also
> > used in node /soc/timer@2800000)
> > arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi:1221.21-1230.5: Warning
> > (unique_unit_address): /soc/pwm@2810000: duplicate unit-address (also
> > used in node /soc/timer@2810000)
> 
> 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?