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Tue, 13 Aug 2024 11:07:46 -0700 (PDT) From: Florian Fainelli To: linux-kernel@vger.kernel.org Cc: Florian Fainelli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sudeep Holla , Cristian Marussi , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), arm-scmi@vger.kernel.org (open list:SYSTEM CONTROL & POWER/MANAGEMENT INTERFACE), linux-arm-kernel@lists.infradead.org (moderated list:SYSTEM CONTROL & POWER/MANAGEMENT INTERFACE), justin.chen@broadcom.com, opendmb@gmail.com, kapil.hali@broadcom.com, bcm-kernel-feedback-list@broadcom.com Subject: [PATCH v2 0/2] Support for I/O width within ARM SCMI SHMEM Date: Tue, 13 Aug 2024 11:07:45 -0700 Message-Id: <20240813180747.1439034-1-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We just got our hands on hardware that only supports 32-bit access width to the SRAM being used. This patch series adds support for the 'reg-io-width' property and allows us to specify the exact access width that the SRAM supports. Changes in v2: - fixed typo in the binding and added reviewed-by tag from Krzysztof - determine the correct I/O operation at the time we parse the 'reg-io-width' property rather than for each tx_prepare/fetch_response/fetch_notification call - dropped support for 1 and 2 bytes 'reg-io-width' as they do not quite make sense, if we can support such smaller access size, then we can support the larger 4 byte access width, too, and there are many places within the SCMI code where ioread32/iowrite32 are used Florian Fainelli (2): dt-bindings: sram: Document reg-io-width property firmware: arm_scmi: Support 'reg-io-width' property for shared memory .../devicetree/bindings/sram/sram.yaml | 6 ++ drivers/firmware/arm_scmi/common.h | 32 +++++++- .../arm_scmi/scmi_transport_mailbox.c | 13 ++- .../firmware/arm_scmi/scmi_transport_optee.c | 10 ++- .../firmware/arm_scmi/scmi_transport_smc.c | 11 ++- drivers/firmware/arm_scmi/shmem.c | 81 +++++++++++++++++-- 6 files changed, 132 insertions(+), 21 deletions(-)