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>

diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c
index dc3f0395693be97540ac58b12ec58b785ff584da..d7644251e8699c914544889fc3ad6440ab6a543d 100644 (file)
--- 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;