linux-kernel - [PATCH RFC 0/2] Introduce ddr[3-4]-channel binding

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Message-ID: <20250626-ddr-bindings-v1-0-cae30933c54c@foss.st.com>
Date: Thu, 26 Jun 2025 21:48:33 +0200
From: Clément Le Goffic <clement.legoffic@...s.st.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Will Deacon <will@...nel.org>,
        Mark
 Rutland <mark.rutland@....com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-perf-users@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Clément Le Goffic <clement.legoffic@...s.st.com>
Subject: [PATCH RFC 0/2] Introduce ddr[3-4]-channel binding

This series aims to request comments for the ddr-channel binding as I'll
need them for the stm32-ddr-pmu driver.
The V1 of the driver and a start of discussion can be found here:
https://lore.kernel.org/r/20250623-ddrperfm-upstream-v1-0-7dffff168090@foss.st.com

The first patch contains a base of binding, which I find sufficient for
my needs but perhaps you'll have suggestion for addition or rework as this is
mainly inspirate from lpddrX-channel binding.
As we can find the same property in the two channel binding maybe this can be
shared properties.

The second patch, that contains stm32-ddr-pmu binding, aims to provide an
example of usage of this ddr-channel bindings.
Note the "memory-channel" property which I mainly want to discuss about
and gather some feedbacks.

For your knowledge, the stm32-ddr-pmu driver (DDRPERFM peripheral) needs
the dram type information for its internal working with ddr events.

Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
---
Clément Le Goffic (2):
      dt-bindings: memory: add jedec,ddr[3-4]-channel binding
      dt-bindings: perf: stm32: introduce DDRPERFM dt-bindings

 .../memory-controllers/ddr/jedec,ddr-channel.yaml  | 53 +++++++++++++
 .../devicetree/bindings/perf/st,stm32-ddr-pmu.yaml | 90 ++++++++++++++++++++++
 2 files changed, 143 insertions(+)
---
base-commit: e34a79b96ab9d49ed8b605fee11099cf3efbb428
change-id: 20250626-ddr-bindings-dbe23bcfe299

Best regards,
-- 
Clément Le Goffic <clement.legoffic@...s.st.com>