linux-kernel - Re: [PATCH v3] pinctrl: core: print gpio in pins debugfs file

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Message-ID: <20200721141034.GA2064533@x1>
Date:   Tue, 21 Jul 2020 16:10:34 +0200
From:   Drew Fustini <drew@...gleboard.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-omap@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>
Subject: Re: [PATCH v3] pinctrl: core: print gpio in pins debugfs file

On Tue, Jul 21, 2020 at 04:02:34PM +0200, Drew Fustini wrote:
> If there is a gpio range mapping for the pin, then print out the gpio
> chip and line index for the pin in the debugfs 'pins' file with the
> format: "[gpiochip-label]:line-[index] "
> 
> For example, here is a section of 'pins' the PocketBeagle (AM3358):
> /sys/kernel/debug/pinctrl/44e10800.pinmux-pinctrl-single/pins
> 
> pin 25 (PIN25) gpio-32-63:line-25 44e10864 00000037 pinctrl-single 
> pin 26 (PIN26) gpio-32-63:line-26 44e10868 00000037 pinctrl-single 
> pin 27 (PIN27) gpio-32-63:line-27 44e1086c 00000037 pinctrl-single 
> pin 28 (PIN28) NA 44e10870 00000036 pinctrl-single 
> pin 29 (PIN29) NA 44e10874 00000006 pinctrl-single 
> pin 30 (PIN30) gpio-32-63:line-28 44e10878 00000027 pinctrl-single 
> pin 31 (PIN31) gpio-32-63:line-29 44e1087c 00000037 pinctrl-single 
> pin 32 (PIN32) gpio-32-63:line-30 44e10880 00000037 pinctrl-single 
> pin 33 (PIN33) gpio-32-63:line-31 44e10884 00000037 pinctrl-single 
> pin 34 (PIN34) gpio-64-95:line-0 44e10888 00000037 pinctrl-single 
> pin 35 (PIN35) gpio-64-95:line-1 44e1088c 00000037 pinctrl-single 
> 
> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Suggested-by: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Drew Fustini <drew@...gleboard.org>
> 
> v3 changes:
> - gpio column is now gpiochip label and line index
> 
> v2 changes:
> - print 'NA' if pin does not have a GPIO number
> - change gpio_num from unsigned to unsigned int per checkpatch
> ---
>  drivers/pinctrl/core.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
> index 821242bb4b16..a23dc264cae7 100644
> --- a/drivers/pinctrl/core.c
> +++ b/drivers/pinctrl/core.c
> @@ -27,6 +27,7 @@
>  #include <linux/pinctrl/machine.h>
>  
>  #ifdef CONFIG_GPIOLIB
> +#include "../gpio/gpiolib.h"
>  #include <asm-generic/gpio.h>
>  #endif
>  
> @@ -1601,6 +1602,9 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
>  	struct pinctrl_dev *pctldev = s->private;
>  	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
>  	unsigned i, pin;
> +	struct pinctrl_gpio_range *range;
> +	unsigned int gpio_num;
> +	struct gpio_chip *chip;
>  
>  	seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
>  
> @@ -1618,6 +1622,23 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
>  
>  		seq_printf(s, "pin %d (%s) ", pin, desc->name);
>  
> +#ifdef CONFIG_GPIOLIB
> +		gpio_num = 0;
> +		list_for_each_entry(range, &pctldev->gpio_ranges, node) {
> +			if ((pin >= range->pin_base) &&
> +			    (pin < (range->pin_base + range->npins))) {
> +				gpio_num = range->base + (pin - range->pin_base);
> +				break;
> +			}
> +		}
> +		chip = gpio_to_chip(gpio_num);
> +		if (chip && chip->gpiodev && chip->gpiodev->base)
> +			seq_printf(s, "%s:line-%u ", chip->label,
> +				gpio_num - chip->gpiodev->base);
> +		else
> +			seq_puts(s, "NA ");
> +#endif
> +
>  		/* Driver-specific info per pin */
>  		if (ops->pin_dbg_show)
>  			ops->pin_dbg_show(pctldev, s, pin);
> -- 
> 2.25.1
> 

Apologies - I should not have put the change log in the commit message.
Please let me know if I should resubmit.

thanks,
drew