linux-kernel - Re: [PATCH v13 1/3] mfd: Add Renesas R-Car Gen3 RPC-IF MFD driver

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Date:   Tue, 4 Jun 2019 08:52:44 +0800
From:   masonccyang@...c.com.tw
To:     "Lee Jones" <lee.jones@...aro.org>
Cc:     bbrezillon@...nel.org, broonie@...nel.org,
        devicetree@...r.kernel.org,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        "Simon Horman" <horms@...ge.net.au>, juliensu@...c.com.tw,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-spi@...r.kernel.org, marek.vasut@...il.com,
        mark.rutland@....com, miquel.raynal@...tlin.com,
        robh+dt@...nel.org, sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH v13 1/3] mfd: Add Renesas R-Car Gen3 RPC-IF MFD driver

Hi Jones,

> > +static int rpc_mfd_probe(struct platform_device *pdev)
> 
> Remove the "mfd" from the nomenclature.

okay, will fix.

> 
> > +   struct device_node *flash;
> > +   const struct mfd_cell *cell;
> > +   struct resource *res;
> > +   struct rpc_mfd *rpc;
> > +   void __iomem *base;
> > +
> > +   flash = of_get_next_child(pdev->dev.of_node, NULL);
> > +   if (!flash) {
> > +      dev_warn(&pdev->dev, "no flash node found\n");
> > +      return -ENODEV;
> > +   }
> > +
> > +   if (of_device_is_compatible(flash, "jedec,spi-nor")) {
> > +      cell = &rpc_spi_ctlr;
> > +   } else if (of_device_is_compatible(flash, "cfi-flash")) {
> > +      cell = &rpc_hf_ctlr;
> > +   } else {
> > +      dev_warn(&pdev->dev, "unknown flash type\n");
> > +      return -ENODEV;
> > +   }
> 
> Are there going to be more children coming?

No, just spi-nor or cfi-flash.

The operation mode is decided at booting time by HW pin configuration.
Can't change spi-nor or cfi-flash mode at run-time.

> 
> If not, I'd argue that this is not an MFD.
> 

umm, agreed.

thanks & best regards,
Mason

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