linux-kernel - [PATCH v2 1/7] gpio: brcmstb: Do not use gc->pin2mask()

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Date:   Tue, 24 Oct 2017 12:54:45 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Gregory Fong <gregory.0xf0@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 1/7] gpio: brcmstb: Do not use gc->pin2mask()

From: Linus Walleij <linus.walleij@...aro.org>

The pin2mask() accessor only shuffles BIT ORDER in big endian systems,
i.e. the bitstuffing is swizzled big endian so "bit 0" is bit 7 or
bit 15 or bit 31 or so.

The brcmstb only uses big endian BYTE ORDER which will be taken car of
by the ->write_reg() callback.

Just use BIT(offset) to assign the bit.

Cc: Gregory Fong <gregory.0xf0@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/gpio/gpio-brcmstb.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c
index 27e92e57adae..9b8fcca7ad17 100644
--- a/drivers/gpio/gpio-brcmstb.c
+++ b/drivers/gpio/gpio-brcmstb.c
@@ -20,6 +20,7 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/interrupt.h>
 #include <linux/reboot.h>
+#include <linux/bitops.h>
 
 #define GIO_BANK_SIZE           0x20
 #define GIO_ODEN(bank)          (((bank) * GIO_BANK_SIZE) + 0x00)
@@ -68,16 +69,15 @@ static void brcmstb_gpio_set_imask(struct brcmstb_gpio_bank *bank,
 {
 	struct gpio_chip *gc = &bank->gc;
 	struct brcmstb_gpio_priv *priv = bank->parent_priv;
-	u32 mask = gc->pin2mask(gc, offset);
 	u32 imask;
 	unsigned long flags;
 
 	spin_lock_irqsave(&gc->bgpio_lock, flags);
 	imask = gc->read_reg(priv->reg_base + GIO_MASK(bank->id));
 	if (enable)
-		imask |= mask;
+		imask |= BIT(offset);
 	else
-		imask &= ~mask;
+		imask &= ~BIT(offset);
 	gc->write_reg(priv->reg_base + GIO_MASK(bank->id), imask);
 	spin_unlock_irqrestore(&gc->bgpio_lock, flags);
 }
-- 
2.14.1