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gpio: mxc: add check to return defer probe if clock tree NOT ready

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commit a329bbe707 upstream.

On i.MX8MQ platform, clock driver uses platform driver
model and it is probed after GPIO driver, so when GPIO
driver fails to get clock, it should check the error type
to decide whether to return defer probe or just ignore
the clock operation.

Fixes: 2808801aab ("gpio: mxc: add clock operation")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anson Huang 2019-02-23 03:18:25 +00:00 committed by Greg Kroah-Hartman
parent a10c88bf36
commit 53ffa56456
1 changed files with 4 additions and 1 deletions
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5
drivers/gpio/gpio-mxc.c
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@ -438,8 +438,11 @@ static int mxc_gpio_probe(struct platform_device *pdev)
/* the controller clock is optional */
port->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(port->clk))
if (IS_ERR(port->clk)) {
if (PTR_ERR(port->clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
port->clk = NULL;
}
err = clk_prepare_enable(port->clk);
if (err) {