linux-kernel - [PATCH v2 0/6] Add SCMI v3.2 Clock new CONFIGs support

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Date:   Sat, 26 Aug 2023 13:53:02 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        f.fainelli@...il.com, vincent.guittot@...aro.org,
        etienne.carriere@...s.st.com, peng.fan@....nxp.com,
        chuck.cannon@....com, souvik.chakravarty@....com,
        nicola.mazzucato@....com,
        Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH v2 0/6] Add SCMI v3.2 Clock new CONFIGs support

Hi all,

this small series introduces support for the new Clock CONFIG features
added by SCMI v3.2 specification [1].

It does NOT add support, still, for the SCMI v3.2 Clock reparenting
features added in v3.2 too.

After a small refactoring in [1/6], support for the new CONFIG_SET message
format is added in [2/6]: this is just internal rework to support new and
legacy (pre-v3.2) message formats.

Patch [3/6] adds support for the new v3.2 CONFIG_GET command and adds a new
related Clock operation .state_get() to retrieve the enabled state of one
clock when talking to a v3.2 compliant server.

Patch [4/6] extend .state_get() support to legacy SCMI platforms implementing
pre-v3.2 SCMI stacks: in such a scenario we can use the old CLOCK_ATTRIBUTES
command to retrieve the clock state.

Patch [5/6] finally wires up this new .state_get() clock operation to the
Linux Clock framework .is_enabled() callback, AS-LONG-AS the underlying
configured SCMI stack supports atomic operations. (since .is_enabled() is
required not to sleep)
This *should* ease unused clocks management by the Linux Clock framework.

Last but not least, patch [6/6] exposes a couple more SCMI Clock operations
in order to be able to set/get OEM specific clock configuration values as
described in SCMI v3.2 specification.

Tested on JUNO and on an SCMI emulation setup.

Based on v6.5-rc5.

Any feedback welcome,

Thanks,
Cristian

[1]: https://developer.arm.com/documentation/den0056/e

----
v1 --> v2
- more descriptive commit message for 1/6
- add and use more descriptive defines to name boolean arguments in clk-scmi.c
- dropped RFC from 6/6

Cristian Marussi (6):
  firmware: arm_scmi: Simplify enable/disable Clock operations
  firmware: arm_scmi: Add Clock v3.2 CONFIG_SET support
  firmware: arm_scmi: Add v3.2 Clock CONFIG_GET support
  firmware: arm_scmi: Add Clock .state_get support to pre-v3.2
  clk: scmi: Add support for .is_enabled clk_ops
  firmware: arm_scmi: Add Clock OEM config clock operations

 drivers/clk/clk-scmi.c            |  34 ++++-
 drivers/firmware/arm_scmi/clock.c | 220 +++++++++++++++++++++++++++---
 include/linux/scmi_protocol.h     |  19 ++-
 3 files changed, 243 insertions(+), 30 deletions(-)

-- 
2.42.0