[PATCH] gpio: mcp23s08: create default gpio base if neither device node nor platform data is defined

[Sonic Zhang]

From: Sonic Zhang <sonic.zh...@analog.com>

Signed-off-by: Sonic Zhang <sonic.zh...@analog.com>
---
 drivers/gpio/gpio-mcp23s08.c |   17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index da9c316..eea5d7e 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -801,9 +801,11 @@ static int mcp230xx_probe(struct i2c_client *client,
                client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
        } else {
                pdata = dev_get_platdata(&client->dev);
-               if (!pdata || !gpio_is_valid(pdata->base)) {
-                       dev_dbg(&client->dev, "invalid platform data\n");
-                       return -EINVAL;
+               if (!pdata) {
+                       pdata = devm_kzalloc(&client->dev,
+                                       sizeof(struct mcp23s08_platform_data),
+                                       GFP_KERNEL);
+                       pdata->base = -1;
                }
        }
 
@@ -924,10 +926,11 @@ static int mcp23s08_probe(struct spi_device *spi)
        } else {
                type = spi_get_device_id(spi)->driver_data;
                pdata = dev_get_platdata(&spi->dev);
-               if (!pdata || !gpio_is_valid(pdata->base)) {
-                       dev_dbg(&spi->dev,
-                                       "invalid or missing platform data\n");
-                       return -EINVAL;
+               if (!pdata) {
+                       pdata = devm_kzalloc(&spi->dev,
+                                       sizeof(struct mcp23s08_platform_data),
+                                       GFP_KERNEL);
+                       pdata->base = -1;
                }
 
                for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
-- 
1.7.9.5

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