i2c: stm32f7: fix the get_irq error cases

During probe, return the "get_irq" error value instead of -EINVAL which
allows the driver to be deferred probed if needed.
Fix also the case where of_irq_get() returns a negative value.
Note :
On failure of_irq_get() returns 0 or a negative value while
platform_get_irq() returns a negative value.

Fixes: aeb068c57214 ("i2c: i2c-stm32f7: add driver")
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 48337be..3d90c0b 100644 (file)
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -25,7 +25,6 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
-#include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pinctrl/consumer.h>
@@ -1816,15 +1815,14 @@ static struct i2c_algorithm stm32f7_i2c_algo = {
 
 static int stm32f7_i2c_probe(struct platform_device *pdev)
 {
-       struct device_node *np = pdev->dev.of_node;
        struct stm32f7_i2c_dev *i2c_dev;
        const struct stm32f7_i2c_setup *setup;
        struct resource *res;
-       u32 irq_error, irq_event, clk_rate, rise_time, fall_time;
+       u32 clk_rate, rise_time, fall_time;
        struct i2c_adapter *adap;
        struct reset_control *rst;
        dma_addr_t phy_addr;
-       int ret;
+       int irq_error, irq_event, ret;
 
        i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
        if (!i2c_dev)
@@ -1836,16 +1834,20 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
                return PTR_ERR(i2c_dev->base);
        phy_addr = (dma_addr_t)res->start;
 
-       irq_event = irq_of_parse_and_map(np, 0);
-       if (!irq_event) {
-               dev_err(&pdev->dev, "IRQ event missing or invalid\n");
-               return -EINVAL;
+       irq_event = platform_get_irq(pdev, 0);
+       if (irq_event <= 0) {
+               if (irq_event != -EPROBE_DEFER)
+                       dev_err(&pdev->dev, "Failed to get IRQ event: %d\n",
+                               irq_event);
+               return irq_event ? : -ENOENT;
        }
 
-       irq_error = irq_of_parse_and_map(np, 1);
-       if (!irq_error) {
-               dev_err(&pdev->dev, "IRQ error missing or invalid\n");
-               return -EINVAL;
+       irq_error = platform_get_irq(pdev, 1);
+       if (irq_error <= 0) {
+               if (irq_error != -EPROBE_DEFER)
+                       dev_err(&pdev->dev, "Failed to get IRQ error: %d\n",
+                               irq_error);
+               return irq_error ? : -ENOENT;
        }
 
        i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);