linux-kernel - Re: [PATCH v2 7/9] gpio: mockup: pass the chip label as device property

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Message-ID: <20200928130023.GJ3956970@smile.fi.intel.com>
Date:   Mon, 28 Sep 2020 16:00:23 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 7/9] gpio: mockup: pass the chip label as device
 property

On Mon, Sep 28, 2020 at 12:41:53PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> While we do check the "chip-name" property in probe(), we never actually
> use it. Let's pass the chip label to the driver using device properties
> as we'll want to allow users to define their own once dynamically
> created chips are supported.
> 
> The property is renamed to "chip-label" to not cause any confusion with
> the actual chip name which is of the form: "gpiochipX".
> 
> If the "chip-label" property is missing, let's do what most devices in
> drivers/gpio/ do and use dev_name().

...

> +		snprintf(chip_label, sizeof(chip_label),
> +			 "gpio-mockup-%c", i + 'A');
> +		properties[prop++] = PROPERTY_ENTRY_STRING("chip-label",
> +							   chip_label);

You added new property, now count is up to 4. But at the same time

	#define GPIO_MOCKUP_MAX_PROP  4

how do you avoid overflow?

-- 
With Best Regards,
Andy Shevchenko