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Groups > linux.kernel > #1579588
| From | Boris Brezillon <boris.brezillon@free-electrons.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] mtd: nand: gpio: make nCE GPIO optional |
| Date | 2017-02-13 11:40 +0100 |
| Message-ID | <tamd4-2uM-15@gated-at.bofh.it> (permalink) |
| References | <t9kn0-4wD-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, 10 Feb 2017 15:01:10 +0100 (CET)
Christophe Leroy <christophe.leroy@c-s.fr> wrote:
> On some hardware, the nCE signal is wired to the ChipSelect associated
> to bus address of the NAND, so it is automatically driven during the
> memory access and it is not managed by a GPIO.
Hm, I'm not sure how this can work, because, AFAIR, the nCE line needs
to stay low for the whole CMD+ADDR[+CMD] cycle, and with your patch
it's not guaranteed.
Can you tell us more about your NAND controller?
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> ---
> drivers/mtd/nand/gpio.c | 18 ++++++++++++------
> 1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mtd/nand/gpio.c b/drivers/mtd/nand/gpio.c
> index 0d24857..85294f1 100644
> --- a/drivers/mtd/nand/gpio.c
> +++ b/drivers/mtd/nand/gpio.c
> @@ -78,7 +78,9 @@ static void gpio_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
> gpio_nand_dosync(gpiomtd);
>
> if (ctrl & NAND_CTRL_CHANGE) {
> - gpio_set_value(gpiomtd->plat.gpio_nce, !(ctrl & NAND_NCE));
> + if (gpio_is_valid(gpiomtd->plat.gpio_nce))
> + gpio_set_value(gpiomtd->plat.gpio_nce,
> + !(ctrl & NAND_NCE));
> gpio_set_value(gpiomtd->plat.gpio_cle, !!(ctrl & NAND_CLE));
> gpio_set_value(gpiomtd->plat.gpio_ale, !!(ctrl & NAND_ALE));
> gpio_nand_dosync(gpiomtd);
> @@ -201,7 +203,8 @@ static int gpio_nand_remove(struct platform_device *pdev)
>
> if (gpio_is_valid(gpiomtd->plat.gpio_nwp))
> gpio_set_value(gpiomtd->plat.gpio_nwp, 0);
> - gpio_set_value(gpiomtd->plat.gpio_nce, 1);
> + if (gpio_is_valid(gpiomtd->plat.gpio_nce))
> + gpio_set_value(gpiomtd->plat.gpio_nce, 1);
>
> return 0;
> }
> @@ -239,10 +242,13 @@ static int gpio_nand_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> - ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nce, "NAND NCE");
> - if (ret)
> - return ret;
> - gpio_direction_output(gpiomtd->plat.gpio_nce, 1);
> + if (gpio_is_valid(gpiomtd->plat.gpio_nce)) {
> + ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nce,
> + "NAND NCE");
> + if (ret)
> + return ret;
> + gpio_direction_output(gpiomtd->plat.gpio_nce, 1);
> + }
>
> if (gpio_is_valid(gpiomtd->plat.gpio_nwp)) {
> ret = devm_gpio_request(&pdev->dev, gpiomtd->plat.gpio_nwp,
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[PATCH] mtd: nand: gpio: make nCE GPIO optional Christophe Leroy <christophe.leroy@c-s.fr> - 2017-02-10 15:30 +0100
Re: [PATCH] mtd: nand: gpio: make nCE GPIO optional Marek Vasut <marek.vasut@gmail.com> - 2017-02-10 16:20 +0100
Re: [PATCH] mtd: nand: gpio: make nCE GPIO optional Boris Brezillon <boris.brezillon@free-electrons.com> - 2017-02-13 11:40 +0100
Re: [PATCH] mtd: nand: gpio: make nCE GPIO optional Christophe LEROY <christophe.leroy@c-s.fr> - 2017-02-13 14:00 +0100
Re: [PATCH] mtd: nand: gpio: make nCE GPIO optional Boris Brezillon <boris.brezillon@free-electrons.com> - 2017-02-13 14:30 +0100
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