PM / AVS: rockchip-io: make io-domains a child of the GRF

IO-domain handling is part of the general register files, so should live
under the grf directly. This change allows the grf to be a simple-mfd and
the io-domains fetching the syscon regmap from that parent-node.

The old binding is of course preserved, though deprecated.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 12 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/power/rockchip-io-domain.txt b/Documentation/devicetree/bindings/power/rockchip-io-domain.txt
index c84fb47265eb..d23dc002a87e 100644
--- a/Documentation/devicetree/bindings/power/rockchip-io-domain.txt
+++ b/Documentation/devicetree/bindings/power/rockchip-io-domain.txt
@@ -37,8 +37,10 @@ Required properties:
   - "rockchip,rk3368-pmu-io-voltage-domain" for rk3368 pmu-domains
   - "rockchip,rk3399-io-voltage-domain" for rk3399
   - "rockchip,rk3399-pmu-io-voltage-domain" for rk3399 pmu-domains
-- rockchip,grf: phandle to the syscon managing the "general register files"
 
+Deprecated properties:
+- rockchip,grf: phandle to the syscon managing the "general register files"
+    Systems should move the io-domains to a sub-node of the grf simple-mfd.
 
 You specify supplies using the standard regulator bindings by including
 a phandle the relevant regulator.  All specified supplies must be able
diff --git a/drivers/power/avs/rockchip-io-domain.c b/drivers/power/avs/rockchip-io-domain.c
index 8986382718dd..01b6d3f9b8fb 100644
--- a/drivers/power/avs/rockchip-io-domain.c
+++ b/drivers/power/avs/rockchip-io-domain.c
@@ -336,6 +336,7 @@ static int rockchip_iodomain_probe(struct platform_device *pdev)
         struct device_node *np = pdev->dev.of_node;
         const struct of_device_id *match;
         struct rockchip_iodomain *iod;
+        struct device *parent;
         int i, ret = 0;
 
         if (!np)
@@ -351,7 +352,14 @@ static int rockchip_iodomain_probe(struct platform_device *pdev)
         match = of_match_node(rockchip_iodomain_match, np);
         iod->soc_data = (struct rockchip_iodomain_soc_data *)match->data;
 
-        iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+        parent = pdev->dev.parent;
+        if (parent && parent->of_node) {
+                iod->grf = syscon_node_to_regmap(parent->of_node);
+        } else {
+                dev_dbg(&pdev->dev, "falling back to old binding\n");
+                iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+        }
+
         if (IS_ERR(iod->grf)) {
                 dev_err(&pdev->dev, "couldn't find grf regmap\n");
                 return PTR_ERR(iod->grf);