linux-kernel - Re: [PATCH v3 2/4] mtd: rawnand: Add Macronix MX25F0A NAND controller

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Date:   Mon, 20 May 2019 14:23:33 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     masonccyang@...c.com.tw
Cc:     bbrezillon@...nel.org, broonie@...nel.org,
        christophe.kerello@...com, computersforpeace@...il.com,
        devicetree@...r.kernel.org, dwmw2@...radead.org,
        geert@...ux-m68k.org, juliensu@...c.com.tw, lee.jones@...aro.org,
        liang.yang@...ogic.com, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
        marcel.ziswiler@...adex.com, marek.vasut@...il.com,
        mark.rutland@....com, paul.burton@...s.com, richard@....at,
        robh+dt@...nel.org, stefan@...er.ch, zhengxunli@...c.com.tw
Subject: Re: [PATCH v3 2/4] mtd: rawnand: Add Macronix MX25F0A NAND
 controller

Hi Mason,

masonccyang@...c.com.tw wrote on Fri, 17 May 2019 17:30:21 +0800:

> Hi Miquel,
> 
> > > +
> > > +static void mxic_nand_select_chip(struct nand_chip *chip, int chipnr)  
> > 
> > _select_target() is preferred now  
> 
> Do you mean I implement mxic_nand_select_target() to control #CS ?
> 
> If so, I need to call mxic_nand_select_target( ) to control #CS ON
> and then #CS OFF in _exec_op() due to nand_select_target()<in nand_base,c>
> is still calling chip->legacy.select_chip ?

You must forget about the ->select_chip() callback. Now it should be
handled directly from the controller driver. Please have a look at the
commit pointed against the marvell_nand.c driver.

[...]

> > > +   if (!mxic)
> > > +      return -ENOMEM;
> > > +
> > > +   nand_chip = &mxic->nand;
> > > +   mtd = nand_to_mtd(nand_chip);
> > > +   mtd->dev.parent = pdev->dev.parent;
> > > +   nand_chip->ecc.priv = NULL;
> > > +   nand_set_flash_node(nand_chip, pdev->dev.parent->of_node);
> > > +   nand_chip->priv = mxic;
> > > +
> > > +   mxic->mfd = mfd;
> > > +
> > > +   nand_chip->legacy.select_chip = mxic_nand_select_chip;  
> > 
> > Please don't implement legacy interfaces. You can check in
> > marvell_nand.c how this is handled now:
> > 
> > b25251414f6e mtd: rawnand: marvell: Stop implementing ->select_chip()
> >   
> 
> Does it mean chip->legacy.select_chip() will phase-out ?

Yes it will.

Thanks,
Miquèl