linux-kernel - [PATCH v4 07/20] dt-bindings: memory: factorise LPDDR channel binding into SDRAM channel

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Message-ID: <20250723-ddrperfm-upstream-v4-7-1aa53ca319f4@foss.st.com>
Date: Wed, 23 Jul 2025 15:05:51 +0200
From: Clément Le Goffic <clement.legoffic@...s.st.com>
To: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Rob
 Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor
 Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel
	<p.zabel@...gutronix.de>,
        Jonathan Corbet <corbet@....net>,
        Gatien Chevallier
	<gatien.chevallier@...s.st.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Gabriel Fernandez
	<gabriel.fernandez@...s.st.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Le
 Goffic <legoffic.clement@...il.com>,
        Julius Werner <jwerner@...omium.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-perf-users@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-clk@...r.kernel.org>,
        Clément Le Goffic <clement.legoffic@...s.st.com>
Subject: [PATCH v4 07/20] dt-bindings: memory: factorise LPDDR channel
 binding into SDRAM channel

LPDDR, DDR and so SDRAM channels exist and share the same properties, they
have a compatible, ranks, and an io-width.

Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
---
 ...lpddr-channel.yaml => jedec,sdram-channel.yaml} | 23 +++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-channel.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,sdram-channel.yaml
similarity index 83%
rename from Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-channel.yaml
rename to Documentation/devicetree/bindings/memory-controllers/ddr/jedec,sdram-channel.yaml
index 34b5bd153f63..9892da520fe4 100644
--- a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,lpddr-channel.yaml
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,sdram-channel.yaml
@@ -1,16 +1,17 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr-channel.yaml#
+$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,sdram-channel.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: LPDDR channel with chip/rank topology description
+title: SDRAM channel with chip/rank topology description
 
 description:
-  An LPDDR channel is a completely independent set of LPDDR pins (DQ, CA, CS,
-  CK, etc.) that connect one or more LPDDR chips to a host system. The main
-  purpose of this node is to overall LPDDR topology of the system, including the
-  amount of individual LPDDR chips and the ranks per chip.
+  A memory channel of SDRAM memory like DDR SDRAM or LPDDR SDRAM is a completely
+  independent set of pins (DQ, CA, CS, CK, etc.) that connect one or more memory
+  chips to a host system. The main purpose of this node is to overall memory
+  topology of the system, including the amount of individual memory chips and
+  the ranks per chip.
 
 maintainers:
   - Julius Werner <jwerner@...omium.org>
@@ -26,14 +27,14 @@ properties:
   io-width:
     description:
       The number of DQ pins in the channel. If this number is different
-      from (a multiple of) the io-width of the LPDDR chip, that means that
+      from (a multiple of) the io-width of the SDRAM chip, that means that
       multiple instances of that type of chip are wired in parallel on this
       channel (with the channel's DQ pins split up between the different
       chips, and the CA, CS, etc. pins of the different chips all shorted
       together).  This means that the total physical memory controlled by a
       channel is equal to the sum of the densities of each rank on the
-      connected LPDDR chip, times the io-width of the channel divided by
-      the io-width of the LPDDR chip.
+      connected SDRAM chip, times the io-width of the channel divided by
+      the io-width of the SDRAM chip.
     enum:
       - 8
       - 16
@@ -51,8 +52,8 @@ patternProperties:
   "^rank@[0-9]+$":
     type: object
     description:
-      Each physical LPDDR chip may have one or more ranks. Ranks are
-      internal but fully independent sub-units of the chip. Each LPDDR bus
+      Each physical SDRAM chip may have one or more ranks. Ranks are
+      internal but fully independent sub-units of the chip. Each SDRAM bus
       transaction on the channel targets exactly one rank, based on the
       state of the CS pins. Different ranks may have different densities and
       timing requirements.

-- 
2.43.0