linux-kernel - Re: [RFC PATCH] mtd: rawnand: ams-delta: use ->exec

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Date:   Thu, 04 Oct 2018 16:11:42 +0200
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mtd: rawnand: ams-delta: use ->exec_op()

On Thursday, October 4, 2018 3:59:33 PM CEST Boris Brezillon wrote:
> On Thu, 04 Oct 2018 15:52:57 +0200
> Janusz Krzysztofik <jmkrzyszt@...il.com> wrote:
> 
> > Hi Boris,
> > 
> > On Wednesday, October 3, 2018 4:06:34 PM CEST Boris Brezillon wrote:
> > > On Wed, 03 Oct 2018 15:55:25 +0200
> > > Janusz Krzysztofik <jmkrzyszt@...il.com> wrote:
> > >     
> > > > > > 
> > > > > > Implementation of NAND_OP_WAITRDY_INSTR has been based on legacy
> > > > > > nand_wait_ready(),    
> > > > > 
> > > > > I don't remember what the ams-delta ->dev_ready()/->waitfunc() hooks
> > > > > are doing, but is shouldn't be too hard to replace them by an
> > > > > ams_delta_wait_ready() func.    
> > > > 
> > > > Default nand_wait() is used as ->waitfunc(), and ->dev_ready() returns 
R/B 
> > > > GPIO pin status.  
> > > 
> > > Okay. Then it might make sense to provide a generic helper to poll a
> > > gpio.
> > > 
> > > void nand_gpio_waitrdy(struct nand_chip *chip, struct gpio_desc *gpiod)
> > > {
> > > 	...
> > > }  
> > 
> > How about a still more generic helper which accepts dev_ready() callback 
as an 
> > argument?
> 
> Nope, I still prefer the GPIO based one. We'll see if others need a
> a more generic helper, but I doubt it.

OK.

Legacy nand_wait_ready() uses a hardcoded timeout value of 400 ms.   Should we 
follow the same approach in nand_gpio_waitrdy(), or should we rather let 
drivers pass the timeout value, like in case of nand_soft_waitrdy()?

Thanks,
Janusz