This commit adds the boolean "brcm,enable-l1ss" property:
The Broadcom STB/CM PCIe HW -- a core that is also used by RPi SOCs --
requires the driver probe() to deliberately place the HW one of three
CLKREQ# modes:
(a) CLKREQ# driven by the RC unconditionally
(b) CLKREQ# driven by the EP for ASPM L0s, L1
(c) Bidirectional CLKREQ#, as used for L1 Substates (L1SS).
The HW+driver can tell the difference between downstream devices that
need (a) and (b), but does not know when to configure (c). All devices
should work fine when the driver chooses (a) or (b), but (c) may be
desired to realize the extra power savings that L1SS offers. So we
introduce the boolean "brcm,enable-l1ss" property to inform the driver
that (c) is desired. Setting this property only makes sense when the
downstream device is L1SS-capable and the OS is configured to activate
this mode (e.g. policy==powersupersave).
This property is already present in the Raspian version of Linux, but the
upstream driver implementation that follows adds more details and
discerns between (a) and (b).
Signed-off-by: Jim Quinlan <james.quinlan@xxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
index 7e15aae7d69e..8b61c2179608 100644
--- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml
@@ -64,6 +64,15 @@ properties:
aspm-no-l0s: true
+ brcm,enable-l1ss:
+ description: Indicates that PCIe L1SS power savings
+ are desired, the downstream device is L1SS-capable, and the
+ OS has been configured to enable this mode. For boards
+ using a mini-card connector, this mode may not meet the
+ TCRLon maximum time of 400ns, as specified in 3.2.5.2.2
+ of the PCI Express Mini CEM 2.0 specification.
+ type: boolean
+
brcm,scb-sizes:
description: u64 giving the 64bit PCIe memory
viewport size of a memory controller. There may be up to
--
2.17.1
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