linux-kernel - [RFC PATCH 1/2] dt-bindings: soc: ti: Add TI PAT bindings

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Date:   Fri, 7 Jun 2019 15:35:22 -0400
From:   "Andrew F. Davis" <afd@...com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Tero Kristo <t-kristo@...com>,
        William Mills <wmills@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        John Stultz <john.stultz@...aro.org>
CC:     <devicetree@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-media@...r.kernel.org>, <linaro-mm-sig@...ts.linaro.org>,
        <linux-kernel@...r.kernel.org>, "Andrew F . Davis" <afd@...com>
Subject: [RFC PATCH 1/2] dt-bindings: soc: ti: Add TI PAT bindings

This patch adds the bindings for the Page-based Address Translator (PAT)
present on various TI SoCs. A Page-based Address Translator (PAT) device
performs address translation using tables stored in an internal SRAM.
Each PAT supports a set number of pages, each occupying a programmable
4KB, 16KB, 64KB, or 1MB of addresses in a window for which an incoming
transaction will be translated.

Signed-off-by: Andrew F. Davis <afd@...com>
---
 .../devicetree/bindings/misc/ti,pat.txt       | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/ti,pat.txt

diff --git a/Documentation/devicetree/bindings/misc/ti,pat.txt b/Documentation/devicetree/bindings/misc/ti,pat.txt
new file mode 100644
index 000000000000..fac20d45ad4c
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/ti,pat.txt
@@ -0,0 +1,34 @@
+Texas Instruments Page-based Address Translator (PAT) driver binding
+--------------------------------------------------------------------
+
+A Page-based Address Translator (PAT) device performs address translation
+using tables stored in an internal SRAM. Each PAT supports a set number of
+pages, each occupying a programmable 4KB, 16KB, 64KB, or 1MB of addresses
+in a window for which an incoming transaction will be translated.
+
+TI-PAT controller Device Node
+=============================
+
+The TI-PAT node describes the Texas Instrument's Page-based Address
+Translator (PAT).
+
+Required properties:
+-------------------
+- compatible: should be "ti,j721e-pat"
+- reg-names:
+	mmrs - Memory mapped registers region
+	table - Location of the table of translation pages
+	window - Window of memory addresses translated by this PAT
+- reg: register addresses corresponding to the above
+
+Example:
+
+navss_pat0: pat@...10000 {
+	compatible = "ti,j721e-pat";
+	reg = <0x00 0x31010000 0x00 0x00000100>,
+	      <0x00 0x36400000 0x00 0x00040000>,
+	      <0x48 0x00000000 0x00 0x40000000>;
+	reg-names = "mmrs",
+	            "table",
+	            "window";
+};
-- 
2.17.1