gpio-mcp23s08: i2c: auto-select base if no DT match or platform data

The call to gpiochip_add made by this driver is capable of auto-selecting a
base if one is not provided. However, it was not called unless there was
already a DT entry or platform data. This patch calls it even if the base is
not already known so that gpiochip_add can attempt to find a usable base.

Signed-off-by: Daniel M. Weeks <dan@danweeks.net>
Acked-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 6a4470b84488..87ed6bf6528b 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -520,14 +520,13 @@ static int mcp230xx_probe(struct i2c_client *client,
 
         match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
                                         &client->dev);
-        if (match) {
+        pdata = client->dev.platform_data;
+        if (match || !pdata) {
                 base = -1;
                 pullups = 0;
         } else {
-                pdata = client->dev.platform_data;
-                if (!pdata || !gpio_is_valid(pdata->base)) {
-                        dev_dbg(&client->dev,
-                                        "invalid or missing platform data\n");
+                if (!gpio_is_valid(pdata->base)) {
+                        dev_dbg(&client->dev, "invalid platform data\n");
                         return -EINVAL;
                 }
                 base = pdata->base;