linux-kernel - Re: [PATCH 2/3] mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver

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Date:   Mon, 24 Sep 2018 19:26:32 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Christophe Kerello <christophe.kerello@...com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>, <richard@....at>,
        <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <marek.vasut@...il.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH 2/3] mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash
 controller driver

On Mon, 24 Sep 2018 18:36:36 +0200
Christophe Kerello <christophe.kerello@...com> wrote:

> >> +static int stm32_fmc2_resume(struct device *dev)
> >> +{
> >> +	struct stm32_fmc2 *fmc2 = dev_get_drvdata(dev);
> >> +	int i, ret;
> >> +
> >> +	pinctrl_pm_select_default_state(dev);
> >> +
> >> +	ret = clk_prepare_enable(fmc2->clk);
> >> +	if (ret) {
> >> +		dev_err(dev, "can not enable the clock\n");
> >> +		return ret;
> >> +	}
> >> +
> >> +	stm32_fmc2_init(fmc2);
> >> +	stm32_fmc2_timings_init(fmc2);
> >> +	stm32_fmc2_setup(fmc2);
> >> +
> >> +	for (i = 0; i < fmc2->ncs; i++)
> >> +		nand_reset(&fmc2->chip, i);  
> > 
> > This means you have one different NAND chip wired on each CS.
> > 
> > We could have two CS wired to the same NAND chip. Calling nand_reset
> > twice would be harmless but a lost of time.

Actually, you have to call nand_reset() for each CS, otherwise not all
dies are reset.