linux-kernel - [PATCH] gpio: TODO: add a task for removing MMIO-specific fields from gpio

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Message-ID: <20250527111353.71540-1-brgl@bgdev.pl>
Date: Tue, 27 May 2025 13:13:53 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] gpio: TODO: add a task for removing MMIO-specific fields from gpio_chip

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Currently for CONFIG_GPIO_GENERIC=y each struct gpio_chip object
contains the fields relevant only for gpio-mmio users. It's not an
insignificant number either as it's several pointers and integers.

It makes sense to remove these fields from struct gpio_chip into a
dedicated structure but this is not trivial due to how the bgpio_init()
function is implemented.

Add a task for tracking this rework.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/TODO | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO
index 4a8b349f2483a..ef53892cb44d7 100644
--- a/drivers/gpio/TODO
+++ b/drivers/gpio/TODO
@@ -131,6 +131,11 @@ Work items:
   helpers (x86 inb()/outb()) and convert port-mapped I/O drivers to use
   this with dry-coding and sending to maintainers to test
 
+- Move the MMIO GPIO specific fields out of struct gpio_chip into a
+  dedicated structure. Currently every GPIO chip has them if gpio-mmio is
+  enabled in Kconfig even if it itself doesn't register with the helper
+  library.
+
 -------------------------------------------------------------------------------
 
 Generic regmap GPIO
-- 
2.48.1