drivers: scmi-msg: support performance domains for DVFS

Implement some of the SCMI performance domain management messages
in scmi-msg drivers to support basic DVFS scenario.

Co-developed-by: Etienn

drivers: scmi-msg: support performance domains for DVFS

Implement some of the SCMI performance domain management messages
in scmi-msg drivers to support basic DVFS scenario.

Co-developed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Pascal Paillet <p.paillet@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: scmi-msg: fix clock min/max/step triplet description support

The return value of plat_scmi_clock_rates_array() is one of "SCMI_DENIED",
"SCMI_GENERIC_ERROR" and "SCMI_SUCCESS".
The code in

drivers: scmi-msg: fix clock min/max/step triplet description support

The return value of plat_scmi_clock_rates_array() is one of "SCMI_DENIED",
"SCMI_GENERIC_ERROR" and "SCMI_SUCCESS".
The code in scmi_clock_describe_rates() for clock min/max/step triplet
description support would never be executed due to the return value of
plat_scmi_clock_rates_array() could never be "SCMI_NOT_SUPPORTED".
Fix by modifying the return value of plat_scmi_clock_rates_array().

Signed-off-by: Tony Han <tony.han@microchip.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: scmi-msg: fix clock rates description remaining count

Fix value of remaining clocks to describe on SCMI clock protocol
message CLOCK_DESCRIBE_RATES that does not take into account the
numbe

drivers: scmi-msg: fix clock rates description remaining count

Fix value of remaining clocks to describe on SCMI clock protocol
message CLOCK_DESCRIBE_RATES that does not take into account the
number of returned clock in the response.

Fixes: 90252e2a52c7 ("drivers: scmi-msg: clock adapts to output buffer size")
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: scmi-msg: correct voltage domain protocol version

Fix the version ID of the implemented SCMI voltage domain protocol that
is v2.0 (ID 0x20000), not v3.0 (ID 0x30000).

Fixes: 006d89b8f49f (

drivers: scmi-msg: correct voltage domain protocol version

Fix the version ID of the implemented SCMI voltage domain protocol that
is v2.0 (ID 0x20000), not v3.0 (ID 0x30000).

Fixes: 006d89b8f49f ("drivers: scmi-msg: add SCMI Voltage Domain protocol")
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

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drivers: scmi_msg: fix size_t trace format

Fix format specifier for size_t type argument.

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@f

drivers: scmi_msg: fix size_t trace format

Fix format specifier for size_t type argument.

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: scmi-msg: add support for clock using generic clock framework

Integrating the clock framework with SCMI allows to avoid boilerplate
code to do so in platform specific files. This patch adds

drivers: scmi-msg: add support for clock using generic clock framework

Integrating the clock framework with SCMI allows to avoid boilerplate
code to do so in platform specific files. This patch adds a generic
layer that uses the generic clock framework to access and expose clocks.
SCMI clocks can be added from platform code using scmi_clk_add().
A new CFG_SCMI_MSG_USE_CLK configuration option is added to enable
this generic clock support.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Thomas Perrot <thomas.perrot@bootlin.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: Propagate errors from platform voltd_get_level

plat_scmi_voltd_get_level is refactored to return an SCMI error code and
retrieve the voltage via an out parameter. This allows erro

drivers: scmi-msg: Propagate errors from platform voltd_get_level

plat_scmi_voltd_get_level is refactored to return an SCMI error code and
retrieve the voltage via an out parameter. This allows errors from the
platform SCMI server implementation to be propagated to the REE.

The implementation for stm32mp1 is updated to handle at least some
possible errors.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Anton Eliasson <anton.eliasson@axis.com>

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drivers: scmi-msg: Fix parameter type

In order to make clock.c and voltage_domain.c compile on
64 bit architecture, we cannot use unsigned int in the
function prototype and size_t in the function de

drivers: scmi-msg: Fix parameter type

In order to make clock.c and voltage_domain.c compile on
64 bit architecture, we cannot use unsigned int in the
function prototype and size_t in the function definition.

Signed-off-by: Ludvig Pärsson <ludvig.parsson@axis.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: add SCMI MSG message protocol

Implements MSG header protocol to handle SCMI messages. MSG header
protocol was introduced in Linux kernel v5.15 [1]. It relies on normal
cached shar

drivers: scmi-msg: add SCMI MSG message protocol

Implements MSG header protocol to handle SCMI messages. MSG header
protocol was introduced in Linux kernel v5.15 [1]. It relies on normal
cached shared memory buffer using a 32bit header followed by the SCMI
message payload.

To support this message interface, the SCMI PTA defines a new capability
and a new command. Capability PTA_SCMI_CAPS_MSG_HEADER allows client and
service to negotiate the desired transport configuration. Command
PTA_SCMI_CMD_PROCESS_MSG_CHANNEL allows client to request processing
of a message sent based on that message exchange protocol.

Platforms shall enable configuration switch CFG_SCMI_MSG_SHM_MSG to have
their SCMI service supporting that communication protocol.

Link: [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f301bba0ca7392d16a6ea4f1d264a91f1fadea1a
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: fix protocol list querying

Corrects the function reporting the SCMI protocols supported by the
platform to not assume 8 protocol IDs at most can be returned. Indeed
the number of

drivers: scmi-msg: fix protocol list querying

Corrects the function reporting the SCMI protocols supported by the
platform to not assume 8 protocol IDs at most can be returned. Indeed
the number of protocol IDs returned depends on the SCMI output buffer
size.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: fix protocol list response size

Corrects the size of the SCMI response payload when querying the list
of the supported protocol. This response payload size depends on the
number o

drivers: scmi-msg: fix protocol list response size

Corrects the size of the SCMI response payload when querying the list
of the supported protocol. This response payload size depends on the
number of protocols enumerated by the response.

Reported-by: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
Link: https://lore.kernel.org/lkml/1698297.NAKyZzlH2u@archbook
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: move entry functions to generic entry

Moves SCMI channel management entry helper functions from smt.c to
generic source file entry.c. This change will ease integration of
other SC

drivers: scmi-msg: move entry functions to generic entry

Moves SCMI channel management entry helper functions from smt.c to
generic source file entry.c. This change will ease integration of
other SCMI shared memory message passing protocol.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: rename chan to channel

Renames local variables chan to channel in smt.c.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@li

drivers: scmi-msg: rename chan to channel

Renames local variables chan to channel in smt.c.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: handle invalid channels

Changes implementation channel_to_smt_hdr() of SMT message management
in scmi-msg driver to support being called with invalid channel ID
to relax implement

drivers: scmi-msg: handle invalid channels

Changes implementation channel_to_smt_hdr() of SMT message management
in scmi-msg driver to support being called with invalid channel ID
to relax implementation. On contrary, scmi_smt_init_agent_channel()
is expected to be called only for valid SMT channels.

By the way, with this change, scmi_entry_smt() read SMT header status
from shared memory after channel in successfully claimed, not before.
The change does not affect the communication and makes the implementation
more consistent. For consistency, I also rename local variables chan to
channel to be more explicit.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: clock adapts to output buffer size

Changes SCMI clocks implementation to not assume the SCMI output
message buffer is of a given size. Implementation still expects the
output shar

drivers: scmi-msg: clock adapts to output buffer size

Changes SCMI clocks implementation to not assume the SCMI output
message buffer is of a given size. Implementation still expects the
output shared memory is at least large enough to hold the SCMI status
information that is 32bit wide.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: voltage domain adapts to output buffer size

Changes SCMI voltage domain implementation to not assume the SCMI output
message buffer is of a given size. Implementation still expect

drivers: scmi-msg: voltage domain adapts to output buffer size

Changes SCMI voltage domain implementation to not assume the SCMI output
message buffer is of a given size. Implementation still expects the
output shared memory is at least large enough to hold the SCMI status
information that is 32bit wide.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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drivers: scmi-msg: relax constraint on output buffer size

Changes scmi_write_response() implementation to not assert the output
buffer size against target payload but return a protocol error instead