linux-kernel - [PATCH] gpio: omap: use dynamic allocation of base

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Message-Id: <20230113205922.2312951-1-andreas@kemnade.info>
Date:   Fri, 13 Jan 2023 21:59:22 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     grygorii.strashko@...com, ssantosh@...nel.org, khilman@...nel.org,
        linus.walleij@...aro.org, brgl@...ev.pl,
        linux-omap@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Andreas Kemnade <andreas@...nade.info>
Subject: [PATCH] gpio: omap: use dynamic allocation of base

Static allocatin is deprecated and may cause probe mess,
if probe order is unusual.

like this example
[    2.553833] twl4030_gpio twl4030-gpio: gpio (irq 145) chaining IRQs 161..178
[    2.561401] gpiochip_find_base: found new base at 160
[    2.564392] gpio gpiochip5: (twl4030): added GPIO chardev (254:5)
[    2.564544] gpio gpiochip5: registered GPIOs 160 to 177 on twl4030
[...]
[    2.692169] omap-gpmc 6e000000.gpmc: GPMC revision 5.0
[    2.697357] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[    2.703643] gpiochip_find_base: found new base at 178
[    2.704376] gpio gpiochip6: (omap-gpmc): added GPIO chardev (254:6)
[    2.704589] gpio gpiochip6: registered GPIOs 178 to 181 on omap-gpmc
[...]
[    2.840393] gpio gpiochip7: Static allocation of GPIO base is deprecated, use dynamic allocation.
[    2.849365] gpio gpiochip7: (gpio-160-191): GPIO integer space overlap, cannot add chip
[    2.857513] gpiochip_add_data_with_key: GPIOs 160..191 (gpio-160-191) failed to register, -16
[    2.866149] omap_gpio 48310000.gpio: error -EBUSY: Could not register gpio chip

So probing was done in an unusual order, causing mess
and chips not getting their gpio in the end.

Signed-off-by: Andreas Kemnade <andreas@...nade.info>
---
maybe CC stable? not sure about good fixes tag.

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

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 80ddc43fd875..f5f3d4b22452 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -1020,7 +1020,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc,
 		if (!label)
 			return -ENOMEM;
 		bank->chip.label = label;
-		bank->chip.base = gpio;
+		bank->chip.base = -1;
 	}
 	bank->chip.ngpio = bank->width;
 
-- 
2.30.2