Linux-GPIO Archive on lore.kernel.org
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From: Linus Walleij <linus.walleij@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Serge Semin <fancer.lancer@gmail.com>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Lee Jones <lee.jones@linaro.org>
Subject: Re: [PATCH v1 2/6] gpio: dwapb: Read GPIO base from snps,gpio-base property
Date: Wed, 10 Jun 2020 13:26:59 +0200
Message-ID: <CACRpkdZD5VNxZzycwbFWrzpT1TxkkViBuzAp5P0KQOW4oWjpVw@mail.gmail.com> (raw)
In-Reply-To: <20200608134300.76091-3-andriy.shevchenko@linux.intel.com>

On Mon, Jun 8, 2020 at 3:43 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:

> For backward compatibility with some legacy devices, introduce
> a new property snps,gpio-base to read GPIO base. Don't advertise
> to discourage users from utilizing it.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

I usually have a very negative gut reaction to any attempts to hardcode
the heavily deprecated use of the gpio_base for the global GPIO
numberspace. The reason is clear from drivers/gpio/TODO I think.

I need a really good explanation why this is needed, the only reason
people have been pushing this in the past is "oh we are using the
sysfs and we don't wanna change the GPIO numbers in our scripts"
which I really want to push back on now that we have the chardev and
the libgpiod utils.

If this is needed for something driver internal, it should stay in a
driver-local
variable.

Yours,
Linus Walleij

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-08 13:42 [PATCH v1 0/6] mfd: Make use of software nodes Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 1/6] gpio: dwapb: Replace irq_shared flag with fwnode type check Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 2/6] gpio: dwapb: Read GPIO base from snps,gpio-base property Andy Shevchenko
2020-06-10 11:26   ` Linus Walleij [this message]
2020-06-10 13:41     ` Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 3/6] mfd: core: Propagate software node group to the sub devices Andy Shevchenko
2020-06-08 19:25   ` Lee Jones
2020-06-09 12:40     ` Andy Shevchenko
2020-06-17 12:51       ` Lee Jones
2020-06-08 13:42 ` [PATCH v1 4/6] mfd: intel_quark_i2c_gpio: Convert to use software nodes Andy Shevchenko
2020-06-10 11:38   ` Linus Walleij
2020-06-10 13:43     ` Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 5/6] gpio: dwapb: Get rid of legacy platform data Andy Shevchenko
2020-06-10 11:39   ` Linus Walleij
2020-06-10 13:47     ` Andy Shevchenko
2020-06-08 13:43 ` [PATCH v1 6/6] gpio: dwapb: Define magic number for IRQ and GPIO lines Andy Shevchenko
2020-06-16 20:02 ` [PATCH v1 0/6] mfd: Make use of software nodes Serge Semin
2020-06-16 21:40   ` Andy Shevchenko
2020-06-16 22:56     ` Serge Semin
2020-06-18  8:56       ` Andy Shevchenko
2020-06-19 22:12         ` Serge Semin
2020-06-20 10:13           ` Andy Shevchenko
2020-06-23  1:49             ` Serge Semin
2020-06-24 12:43               ` Andy Shevchenko

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