linux-kernel - [PATCH v1] gpio: mt7621: Assign base field in gpio

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Date:   Sun, 13 Jun 2021 14:06:08 +0200
From:   Reto Schneider <code@...o-schneider.ch>
To:     linux-gpio@...r.kernel.org, linux-mediatek@...ts.infradead.org
Cc:     Stefan Roese <sr@...x.de>,
        Reto Schneider <reto.schneider@...qvarnagroup.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] gpio: mt7621: Assign base field in gpio_chip

From: Reto Schneider <reto.schneider@...qvarnagroup.com>

This is needed for gpiochip_sysfs_register() to properly export
/sys/class/gpio/gpiochip{0,32,64}.

Without this fix, the field base in gpio_device remains at its
initialization value, which is -1. This causes
gpiochip_add_data_with_key() to call gpiochip_find_base(), which in turn
dynamically determines the base to be at ARCH_NR_GPIOS - 32/64/96,
resulting in gpiochip{480,448,416}.

Detected/fixed/tested on a MediaTek MT7688 based GARDENA smart gateway.

Signed-off-by: Reto Schneider <reto.schneider@...qvarnagroup.com>

---

 drivers/gpio/gpio-mt7621.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
index 82fb20dca53a..403d64cd65a6 100644
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c
@@ -234,6 +234,7 @@ mediatek_gpio_bank_probe(struct device *dev,
 		return ret;
 	}
 
+	rg->chip.base = rg->bank * MTK_BANK_WIDTH;
 	rg->chip.of_gpio_n_cells = 2;
 	rg->chip.of_xlate = mediatek_gpio_xlate;
 	rg->chip.label = devm_kasprintf(dev, GFP_KERNEL, "%s-bank%d",
-- 
2.30.2