Re: [PATCH] gpio: mxs: use dynamic allocation of base
From: Stefan Wahren <hidden>
Date: 2023-02-27 17:53:15
Also in:
linux-gpio, lkml
Hi Dario, Am 26.02.23 um 21:53 schrieb Dario Binacchi:
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:
[ 0.136834] gpio gpiochip0: Static allocation of GPIO base is deprecated, use dynamic allocation.
[ 0.142753] gpio gpiochip1: Static allocation of GPIO base is deprecated, use dynamic allocation.
[ 0.148452] gpio gpiochip2: Static allocation of GPIO base is deprecated, use dynamic allocation.
[ 0.154341] gpio gpiochip3: Static allocation of GPIO base is deprecated, use dynamic allocation.
[ 0.160097] gpio gpiochip4: Static allocation of GPIO base is deprecated, use dynamic allocation.
So let's follow the suggestion and use dynamic allocation.i understand the motivation of avoiding these warnings. AFAIK the MXS platform is older than the dynamic allocation of GPIO base. In the perfect world all applications has been migrated to libgpiod / chardev GPIO. But i'm really concerned this hasn't happend yet, at least for this platform. So i believe this change break applications, since it affects userspace. Best regards
quoted hunk ↗ jump to hunk
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> --- drivers/gpio/gpio-mxs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c index 7f59e5d936c2..b48a7c1fb7c1 100644 --- a/drivers/gpio/gpio-mxs.c +++ b/drivers/gpio/gpio-mxs.c@@ -330,7 +330,7 @@ static int mxs_gpio_probe(struct platform_device *pdev) port->gc.to_irq = mxs_gpio_to_irq; port->gc.get_direction = mxs_gpio_get_direction; - port->gc.base = port->id * 32; + port->gc.base = -1; err = gpiochip_add_data(&port->gc, port); if (err)
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