gpio: brcmstb: Set endian flags for big-endian MIPS

Broadcom MIPS-based STB chips endianness is configured by boot strap,
which also reverses all bus endianness (i.e., big-endian CPU + big
endian bus ==> native endian I/O).

Other architectures (e.g., ARM) either do not support big endian, or
else leave I/O in little endian mode.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c
index dc3f0395693b..d7644251e869 100644
--- a/drivers/gpio/gpio-brcmstb.c
+++ b/drivers/gpio/gpio-brcmstb.c
@@ -409,6 +409,7 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
         int num_banks = 0;
         int err;
         static int gpio_base;
+        unsigned long flags = 0;
 
         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
         if (!priv)
@@ -438,6 +439,18 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
         if (brcmstb_gpio_sanity_check_banks(dev, np, res))
                 return -EINVAL;
 
+        /*
+         * MIPS endianness is configured by boot strap, which also reverses all
+         * bus endianness (i.e., big-endian CPU + big endian bus ==> native
+         * endian I/O).
+         *
+         * Other architectures (e.g., ARM) either do not support big endian, or
+         * else leave I/O in little endian mode.
+         */
+#if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN)
+        flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
+#endif
+
         of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
                         bank_width) {
                 struct brcmstb_gpio_bank *bank;
@@ -466,7 +479,7 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
                 err = bgpio_init(gc, dev, 4,
                                 reg_base + GIO_DATA(bank->id),
                                 NULL, NULL, NULL,
-                                reg_base + GIO_IODIR(bank->id), 0);
+                                reg_base + GIO_IODIR(bank->id), flags);
                 if (err) {
                         dev_err(dev, "bgpio_init() failed\n");
                         goto fail;