[PATCH v3 1/3] dt-bindings: crypto: fsl-sec4: add snvs clock to pwrkey

["Horia Geantă" <horia.geanta@nxp.com>]

From: André Draszik <git@andred.net>

On i.MX7 and i.MX8M, the SNVS requires a clock. This is similar to the
clock bound to the SNVS RTC node, but if the SNVS RTC driver isn't
enabled, then SNVS doesn't work, and as such the pwrkey driver doesn't
work (i.e. hangs the kernel, as the clock isn't enabled).

Also see commit ec2a844ef7c1
("ARM: dts: imx7s: add snvs rtc clock")
for a similar fix.

Signed-off-by: André Draszik <git@andred.net>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
---
 .../devicetree/bindings/crypto/fsl-sec4.txt     | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
index 8f359f473ada..1800d57edb66 100644
--- a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
+++ b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
@@ -449,6 +449,19 @@ System ON/OFF key driver
       Value type: <phandle>
       Definition: this is phandle to the register map node.
 
+   - clocks
+      Usage: optional, required if SNVS LP requires explicit
+          enablement of clocks
+      Value type: <prop_encoded-array>
+      Definition:  a clock specifier describing the clock required for
+          enabling and disabling SNVS LP.
+
+   - clock-names
+      Usage: optional, required if SNVS LP requires explicit
+          enablement of clocks
+      Value type: <string>
+      Definition: clock name string should be "snvs-pwrkey".
+
 EXAMPLE:
 	snvs-pwrkey@020cc000 {
 		compatible = "fsl,sec-v4.0-pwrkey";
@@ -456,6 +469,8 @@ EXAMPLE:
 		interrupts = <0 4 0x4>
 	        linux,keycode = <116>; /* KEY_POWER */
 		wakeup-source;
+		clocks = <&clks IMX7D_SNVS_CLK>;
+		clock-names = "snvs-pwrkey";
 	};
 
 =====================================================================
@@ -547,6 +562,8 @@ FULL EXAMPLE
 			interrupts = <0 4 0x4>;
 			linux,keycode = <116>; /* KEY_POWER */
 			wakeup-source;
+			clocks = <&clks IMX7D_SNVS_CLK>;
+			clock-names = "snvs-pwrkey";
 		};
 	};
 
-- 
2.17.1