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From: Ulrich Hecht <uli@fpond.eu>
To: Geert Uytterhoeven <geert+renesas@glider.be>,
	Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Harish Jenny K N <harish_kandiga@mentor.com>,
	Eugeniu Rosca <erosca@de.adit-jv.com>
Cc: Alexander Graf <graf@amazon.com>,
	Peter Maydell <peter.maydell@linaro.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Phil Reid <preid@electromag.com.au>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Christoffer Dall <christoffer.dall@arm.com>,
	Magnus Damm <magnus.damm@gmail.com>,
	linux-gpio@vger.kernel.org, linux-doc@vger.kernel.org,
	devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: [PATCH v3 3/7] gpiolib: Add support for GPIO line table lookup
Date: Thu, 28 Nov 2019 04:39:14 +0100 (CET)
Message-ID: <1581673808.1467700.1574912354104@webmail.strato.com> (raw)
In-Reply-To: <20191127084253.16356-4-geert+renesas@glider.be>


> On November 27, 2019 at 9:42 AM Geert Uytterhoeven <geert+renesas@glider.be> wrote:
> 
> 
> Currently GPIOs can only be referred to by GPIO controller and offset in
> GPIO lookup tables.
> 
> Add support for looking them up by line name.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> If this is rejected, the GPIO Aggregator documentation and code must be
> updated.
> 
> v3:
>   - New.
> ---
>  drivers/gpio/gpiolib.c       | 12 ++++++++++++
>  include/linux/gpio/machine.h |  2 +-
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index d24a3d79dcfe69ad..cb608512ad6bbded 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -4475,6 +4475,18 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
>  		if (p->con_id && (!con_id || strcmp(p->con_id, con_id)))
>  			continue;
>  
> +		if (p->chip_hwnum == (u16)-1) {
> +			desc = gpio_name_to_desc(p->chip_label);
> +			if (desc) {
> +				*flags = p->flags;
> +				return desc;
> +			}
> +
> +			dev_warn(dev, "cannot find GPIO line %s, deferring\n",
> +				 p->chip_label);
> +			return ERR_PTR(-EPROBE_DEFER);
> +		}
> +
>  		chip = find_chip_by_name(p->chip_label);
>  
>  		if (!chip) {
> diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
> index 1ebe5be05d5f81fa..84c1c097e55eefaf 100644
> --- a/include/linux/gpio/machine.h
> +++ b/include/linux/gpio/machine.h
> @@ -31,7 +31,7 @@ enum gpio_lookup_flags {
>   */
>  struct gpiod_lookup {
>  	const char *chip_label;
> -	u16 chip_hwnum;
> +	u16 chip_hwnum;			/* if -1, chip_label is named line */

The magic number "-1" might deserve a #define.

>  	const char *con_id;
>  	unsigned int idx;
>  	unsigned long flags;
> -- 
> 2.17.1
>

With or without #define,
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>

CU
Uli

  reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27  8:42 [PATCH v3 0/7] gpio: Add GPIO Aggregator/Repeater Geert Uytterhoeven
2019-11-27  8:42 ` [PATCH v3 1/7] gpiolib: Add GPIOCHIP_NAME definition Geert Uytterhoeven
2019-11-28  3:38   ` Ulrich Hecht
2019-12-02 21:17   ` Eugeniu Rosca
2019-12-12 10:37   ` Linus Walleij
2019-11-27  8:42 ` [PATCH v3 2/7] gpiolib: Add support for gpiochipN-based table lookup Geert Uytterhoeven
2019-11-28  3:38   ` Ulrich Hecht
2019-12-12 13:20   ` Linus Walleij
2019-12-12 13:33     ` Geert Uytterhoeven
2019-12-12 14:36       ` Linus Walleij
2019-11-27  8:42 ` [PATCH v3 3/7] gpiolib: Add support for GPIO line " Geert Uytterhoeven
2019-11-28  3:39   ` Ulrich Hecht [this message]
2019-12-12 13:40   ` Linus Walleij
2019-11-27  8:42 ` [PATCH v3 4/7] dt-bindings: gpio: Add gpio-repeater bindings Geert Uytterhoeven
2019-11-28  3:39   ` Ulrich Hecht
2019-12-03  5:51   ` Harish Jenny K N
2019-12-05 21:06   ` Rob Herring
2019-12-06  9:17     ` Geert Uytterhoeven
2019-12-06 15:03       ` Rob Herring
2020-01-06  8:12         ` Geert Uytterhoeven
2020-01-07  9:22           ` Harish Jenny K N
2020-01-16  5:09             ` Harish Jenny K N
2019-11-27  8:42 ` [PATCH v3 5/7] gpio: Add GPIO Aggregator/Repeater driver Geert Uytterhoeven
2019-11-27 14:15   ` Eugeniu Rosca
2019-11-27 14:33     ` Geert Uytterhoeven
2019-11-28  3:40   ` Ulrich Hecht
2019-12-03  5:42   ` Harish Jenny K N
2019-12-03  8:17     ` Geert Uytterhoeven
2019-12-03  8:51       ` Harish Jenny K N
2019-12-03 10:51   ` Eugeniu Rosca
2020-01-09 13:35     ` Geert Uytterhoeven
2020-01-09 13:49       ` Eugeniu Rosca
2019-12-12 14:34   ` Linus Walleij
2019-12-12 15:24     ` Geert Uytterhoeven
2020-01-04  0:38       ` Linus Walleij
2020-01-06  8:23         ` Geert Uytterhoeven
2020-01-08 23:12           ` Linus Walleij
2019-11-27  8:42 ` [PATCH v3 6/7] docs: gpio: Add GPIO Aggregator/Repeater documentation Geert Uytterhoeven
2019-11-28  3:41   ` Ulrich Hecht
2019-12-12 14:42   ` Linus Walleij
2019-12-12 14:48     ` Geert Uytterhoeven
2020-01-04  0:21       ` Linus Walleij
2020-01-06  8:06         ` Geert Uytterhoeven
2019-11-27  8:42 ` [PATCH v3 7/7] MAINTAINERS: Add GPIO Aggregator/Repeater section Geert Uytterhoeven
2019-12-03  5:38   ` Harish Jenny K N
2020-01-18  1:46 ` [PATCH v3 0/7] gpio: Add GPIO Aggregator/Repeater Eugeniu Rosca
2020-01-20  9:33   ` Geert Uytterhoeven
2020-01-20 12:14     ` Eugeniu Rosca

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