[PATCH v4 3/3] soc: imx: gpcv2: fix suspend/resume by setting GENPD_FLAG_IRQ_ON

[Martin Kepplinger]

For boards that use power-domains' power-supplies that need interrupts
to work (like regulator over i2c), set GENPD_FLAG_IRQ_ON.
This will tell genpd to adjust accordingly. Currently it "only" sets the
correct suspend/resume callbacks.

This fixes suspend/resume on imx8mq-librem5 boards (tested) and
imx8mq-evk (by looking at dts) and possibly more.

Signed-off-by: Martin Kepplinger <martin.kepplinger at puri.sm>
---
 drivers/soc/imx/gpcv2.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index 85aa86e1338a..46d2ead2352b 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c
@@ -1303,6 +1303,7 @@ static const struct imx_pgc_domain_data imx8mn_pgc_domain_data = {
 static int imx_pgc_domain_probe(struct platform_device *pdev)
 {
 	struct imx_pgc_domain *domain = pdev->dev.platform_data;
+	struct device_node *dn;
 	int ret;
 
 	domain->dev = &pdev->dev;
@@ -1333,6 +1334,14 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
 		regmap_update_bits(domain->regmap, domain->regs->map,
 				   domain->bits.map, domain->bits.map);
 
+	dn = of_parse_phandle(domain->dev->of_node, "power-supply", 0);
+	if (dn) {
+		while ((dn = of_get_next_parent(dn))) {
+			if (of_get_property(dn, "interrupts", NULL))
+				domain->genpd.flags |= GENPD_FLAG_IRQ_ON;
+		}
+	}
+
 	ret = pm_genpd_init(&domain->genpd, NULL, true);
 	if (ret) {
 		dev_err(domain->dev, "Failed to init power domain\n");
-- 
2.30.2