linux-kernel - [PATCH v2 0/2] firmware: arm_scmi: create scmi devices for protocols that not have of

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Date: Wed, 26 Jun 2024 16:32:09 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: arm-scmi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: [PATCH v2 0/2] firmware: arm_scmi: create scmi devices for
 protocols that not have of_node

Per
https://lore.kernel.org/all/20230125141113.kkbowopusikuogx6@bogus/
"
In short we shouldn't have to add a node if there are no consumers. It
was one of the topic of discussion initially when SCMI binding was added
and they exist only for the consumers otherwise we don't need it as
everything is discoverable from the interface.
"
https://lore.kernel.org/all/Y9JLUIioxFPn4BS0@e120937-lin/
If a node has its own channel, the of_node is still needed.

i.MX95 SCMI firmware not have dedicated channel for 0x12, and no need
of_node. This patchset is to support protocol 0x12 without the procotol
node in device tree.

Without of_node, still need to create the scmi devices. As of now,
it is based on an array 'protocols[]' in 'scmi_probe'. 

And no of_node, means no per protocol channel, so reuse the base
protocol channel. Need patch chan_available to support.

Signed-off-by: Peng Fan <peng.fan@....com>
---
Changes in v2:
- Fix a build error that missing ";" 
- Print hex value of protocol id when error
- Link to v1: https://lore.kernel.org/r/20240626-scmi-driver-v1-0-f16d777e004a@nxp.com

---
Peng Fan (2):
      firmware: arm_scmi: channel unavailable if no of_node
      firmware: arm_scmi: create scmi_devices that not have of_node

 drivers/firmware/arm_scmi/driver.c  | 33 ++++++++++++++++++++++++++++++++-
 drivers/firmware/arm_scmi/mailbox.c |  2 ++
 drivers/firmware/arm_scmi/optee.c   |  3 +++
 drivers/firmware/arm_scmi/smc.c     |  7 ++++++-
 drivers/firmware/arm_scmi/virtio.c  |  3 +++
 5 files changed, 46 insertions(+), 2 deletions(-)
---
base-commit: d8003eb2eb0200352b5d63af77ec0912a52e79ad
change-id: 20240626-scmi-driver-96dc61b036a2

Best regards,
-- 
Peng Fan <peng.fan@....com>