Commit b17c70cd authored May 27, 2015 by Lucas Stach Committed by Shawn Guo May 27, 2015

ARM: imx6: gpc: don't register power domain if DT data is missing

If the devicetree is too old and does not provide the regulator and clocks
for the power domain, we need to avoid registering the power domain.
Otherwise runtime PM will try to control the domain, which will lead to
machine hangs without the proper DT configuration data.

This restores functionality to the kernel 4.0 level if an old DT is
detected, where the power domain is constantly powered on.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

parent 634a6037

arch/arm/mach-imx/gpc.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -449,6 +449,10 @@ static int imx_gpc_probe(struct platform_device *pdev)
		struct regulator *pu_reg;
		int ret;

		/* bail out if DT too old and doesn't provide the necessary info */
		if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
		return 0;

		pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
		if (PTR_ERR(pu_reg) == -ENODEV)
		pu_reg = NULL;