[PATCH v2 5/5] drivers: firmware: psci: add PSCI v1.0 DT bindings

[Lorenzo Pieralisi]

PSCI 1.0 is designed to be fully compliant to the PSCI 0.2
specification, with minor differences that are described in the
PSCI specification.

In particular, PSCI v1.0 augments the specification with a new
power_state format (extended stateid - probeable through the
PSCI_FEATURES call), changes some function return codes and
functions usage requirements wrt PSCI 0.2. These changes mean
that 1.0 vs 0.2 compliancy should be enforced through a DT
compatible string that allows firmware to specify 1.0 only
compliancy so that older kernels are prevented from using
PSCI 1.0 FW implementations in a non-compatible way (eg by
calling a 1.0 FW implementation and expecting 0.2 behaviour).

This patch adds PSCI 1.0 DT bindings and related compatible
string.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
Acked-by: Sudeep Holla <sudeep.holla at arm.com>
Cc: Mark Rutland <mark.rutland at arm.com>
---
 Documentation/devicetree/bindings/arm/psci.txt | 6 ++++++
 drivers/firmware/psci.c                        | 1 +
 2 files changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt
index 5aa40ed..a9adab8 100644
--- a/Documentation/devicetree/bindings/arm/psci.txt
+++ b/Documentation/devicetree/bindings/arm/psci.txt
@@ -31,6 +31,10 @@ Main node required properties:
 					support, but are permitted to be present for compatibility with
 					existing software when "arm,psci" is later in the compatible list.
 
+				* "arm,psci-1.0" : for implementations complying to PSCI 1.0. PSCI 1.0 is
+					backward compatible with PSCI 0.2 with minor specification updates,
+					as defined in the PSCI specification[2].
+
  - method        : The method of calling the PSCI firmware. Permitted
                    values are:
 
@@ -100,3 +104,5 @@ Case 3: PSCI v0.2 and PSCI v0.1.
 
 [1] Kernel documentation - ARM idle states bindings
     Documentation/devicetree/bindings/arm/idle-states.txt
+[2] Power State Coordination Interface (PSCI) specification
+    http://infocenter.arm.com/help/topic/com.arm.doc.den0022c/DEN0022C_Power_State_Coordination_Interface.pdf
diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index bd2ba5b..5b544d7 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -392,6 +392,7 @@ out_put_node:
 static const struct of_device_id psci_of_match[] __initconst = {
 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
+	{ .compatible = "arm,psci-1.0",	.data = psci_0_2_init},
 	{},
 };
 
-- 
2.2.1