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 <[email protected]>
Acked-by: Rob Herring <[email protected]>
Cc: "Horia Geantă" <[email protected]>
Cc: Aymen Sghaier <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Pengutronix Kernel Team <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: NXP Linux Team <[email protected]>
Cc: Dmitry Torokhov <[email protected]>
Cc: Anson Huang <[email protected]>
Cc: Robin Gong <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
v2:
* split documentation and i.MX7 dts update into two patches
* remove stray RTC references from documentation (copy/paste error)
---
.../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 2fe245ca816a..a73722c58fab 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";
};
};
--
2.23.0.rc1