linux-kernel - Re: [PATCH v4 8/8] mtd: maps: gpio-addr-flash: Add support for device-tree devices

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Message-ID: <CAPybu_06=Mz+wGLeodM4CjP810Dphm9JKLmX62FVmspy0888ag@mail.gmail.com>
Date:   Wed, 3 Oct 2018 21:34:25 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Zhouyang Jia <jiazhouyang09@...il.com>,
        linux-mtd@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 8/8] mtd: maps: gpio-addr-flash: Add support for
 device-tree devices

Hi Boris
On Wed, Oct 3, 2018 at 7:01 PM Boris Brezillon
<boris.brezillon@...tlin.com> wrote:
>
> On Mon,  1 Oct 2018 14:43:51 +0200
> Ricardo Ribalda Delgado <ricardo.ribalda@...il.com> wrote:
>
> > +static int gpio_flash_probe_gpios(struct platform_device *pdev,
> > +                               struct async_state *state)
> > +{
> > +     struct physmap_flash_data *pdata;
> > +     struct device_node *dn;
> > +     struct resource *gpios = NULL;
> > +     int i;
> > +
> > +     dn = pdev->dev.of_node;
> > +     if (dn) {
> > +             state->gpios = devm_gpiod_get_array(&pdev->dev, NULL,
> > +                                                 GPIOD_OUT_LOW);
>
> Did you consider using gpiod_set_array_value() to update the gpio vals
> instead of having your own update loop (the for loop in the
> gf_set_gpios() func)?

Yes briefly but there are some cons:

- I need to allocate the value_array
- I want to relay on my cached old values, so I still have to loop


-- 
Ricardo Ribalda