gpio: zynq: Do PM initialization earlier to support gpio hogs
GPIO hogs registration is call at the end of gpiochip_add() function.
Calling sequence is:
gpiochip_add -> of_gpiochip_add -> of_gpiochip_scan_hogs ->
gpiod_hog -> gpiochip_request_own_desc -> __gpiod_request ->
chip->request -> zynq_gpio_request which calls pm_runtime_get_sync()
which returns -13 because PM is not initialized yet.
Initialize PM before gpiochip_add is called to fix this issue.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 8a04e00..ba11507 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -708,23 +708,23 @@
chip->base = -1;
chip->ngpio = gpio->p_data->ngpio;
- /* Enable GPIO clock */
+ /* Retrieve GPIO clock */
gpio->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(gpio->clk)) {
dev_err(&pdev->dev, "input clock not found.\n");
return PTR_ERR(gpio->clk);
}
- ret = clk_prepare_enable(gpio->clk);
- if (ret) {
- dev_err(&pdev->dev, "Unable to enable clock.\n");
+
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0)
return ret;
- }
/* report a bug if gpio chip registration fails */
ret = gpiochip_add(chip);
if (ret) {
dev_err(&pdev->dev, "Failed to add gpio chip\n");
- goto err_disable_clk;
+ goto err_pm_put;
}
/* disable interrupts for all banks */
@@ -742,15 +742,14 @@
gpiochip_set_chained_irqchip(chip, &zynq_gpio_edge_irqchip, gpio->irq,
zynq_gpio_irqhandler);
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
+ pm_runtime_put(&pdev->dev);
return 0;
err_rm_gpiochip:
gpiochip_remove(chip);
-err_disable_clk:
- clk_disable_unprepare(gpio->clk);
+err_pm_put:
+ pm_runtime_put(&pdev->dev);
return ret;
}