linux-kernel - [PATCH] pinctrl: stm32: use dynamic allocation of GPIO base

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Message-Id: <20230227205131.2104082-1-dario.binacchi@amarulasolutions.com>
Date:   Mon, 27 Feb 2023 21:51:31 +0100
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bernhard Rosenkränzer <bero@...libre.com>,
        Fabien Dessenne <fabien.dessenne@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Marek Vasut <marex@...x.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH] pinctrl: stm32: use dynamic allocation of GPIO base

Since commit 502df79b860563d7 ("gpiolib: Warn on drivers still using static
gpiobase allocation"), one or more warnings are printed during boot on
systems where static allocation of GPIO base is used:

[    0.197707] gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.199942] stm32f429-pinctrl soc:pinctrl@...20000: GPIOA bank added
[    0.200711] gpio gpiochip1: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.202855] stm32f429-pinctrl soc:pinctrl@...20000: GPIOB bank added
[    0.203591] gpio gpiochip2: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.205704] stm32f429-pinctrl soc:pinctrl@...20000: GPIOC bank added
[    0.206338] gpio gpiochip3: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.208448] stm32f429-pinctrl soc:pinctrl@...20000: GPIOD bank added
[    0.209182] gpio gpiochip4: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.211282] stm32f429-pinctrl soc:pinctrl@...20000: GPIOE bank added
[    0.212094] gpio gpiochip5: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.214270] stm32f429-pinctrl soc:pinctrl@...20000: GPIOF bank added
[    0.215005] gpio gpiochip6: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.217110] stm32f429-pinctrl soc:pinctrl@...20000: GPIOG bank added
[    0.217845] gpio gpiochip7: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.219959] stm32f429-pinctrl soc:pinctrl@...20000: GPIOH bank added
[    0.220602] gpio gpiochip8: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.222714] stm32f429-pinctrl soc:pinctrl@...20000: GPIOI bank added
[    0.223483] gpio gpiochip9: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.225594] stm32f429-pinctrl soc:pinctrl@...20000: GPIOJ bank added
[    0.226336] gpio gpiochip10: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    0.228490] stm32f429-pinctrl soc:pinctrl@...20000: GPIOK bank added

So let's follow the suggestion and use dynamic allocation.

Tested on STM32F429I-DISC1 board.

Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
---

 drivers/pinctrl/stm32/pinctrl-stm32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index cb33a23ab0c1..04ace4c7bd58 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -1330,7 +1330,7 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
 	if (fwnode_property_read_u32(fwnode, "st,bank-ioport", &bank_ioport_nr))
 		bank_ioport_nr = bank_nr;

-	bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
+	bank->gpio_chip.base = -1;

 	bank->gpio_chip.ngpio = npins;
 	bank->gpio_chip.fwnode = fwnode;
-- 
2.32.0