linux-kernel - [PATCH v2 1/2] dt-bindings: ufs: Add UFS platform driver for Cadence UFS

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Date:   Thu, 12 Jul 2018 11:58:04 +0000
From:   Janek Kotas <jank@...ence.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "vinholikatti@...il.com" <vinholikatti@...il.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: [PATCH v2 1/2] dt-bindings: ufs: Add UFS platform driver for Cadence
 UFS

This patch adds a device tree platform
driver description for Cadence UFS Controller.

Signed-off-by: Jan Kotas <jank@...ence.com>
---
 .../devicetree/bindings/ufs/cdns,ufshc.txt         | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ufs/cdns,ufshc.txt

diff --git a/Documentation/devicetree/bindings/ufs/cdns,ufshc.txt b/Documentation/devicetree/bindings/ufs/cdns,ufshc.txt
new file mode 100644
index 0000000..cb6d62a
--- /dev/null
+++ b/Documentation/devicetree/bindings/ufs/cdns,ufshc.txt
@@ -0,0 +1,31 @@
+* Cadence Universal Flash Storage (UFS) Controller
+
+UFS nodes are defined to describe on-chip UFS host controllers.
+Each UFS controller instance should have its own node.
+
+Required properties:
+- compatible	: compatible list, contains the following controller:
+			"cdns,ufshc"
+		  complemented with the JEDEC version:
+			"jedec,ufs-2.0"
+
+- reg		: address and length of the UFS register set
+- interrupts	: one interrupt mapping
+- clocks	: List of phandle and clock specifier pairs.
+- clock-names	: List of clock input name strings sorted in the same
+		  order as the clocks property. "core" is mandatory.
+- freq-table-hz	: Array of <min max> operating frequencies stored in the same
+		  order as the clocks property. If this property is not
+		  defined or a value in the array is "0" then it is assumed
+		  that the frequency is set by the parent clock or a
+		  fixed rate clock source.
+
+Example:
+	ufs@...30000 {
+		compatible = "cdns,ufshc", "jedec,ufs-2.0";
+		reg = <0xfd030000 0x10000>;
+		interrupts = <0 1 IRQ_TYPE_LEVEL_HIGH>;
+		freq-table-hz = <0 0>, <0 0>;
+		clocks = <&ufs_core_clk>, <&ufs_phy_clk>;
+		clock-names = "core_clk", "phy_clk";
+	};
-- 
1.9.0