All Qualcomm platforms implements a shared heap among the processors in the SoC, used for sharing data with other parts of the system. One consumer of items from this heap is the "Shared Memory Driver", a ring buffer based point-to-point communication mechanism used to send either stream or packet based data to remote processors. Starting with 8x74 this system is used to talk to the Resource Power Manager (RPM), a power efficient "coprocessor" with responsibility of aggregate votes from the various systems in the SoC related to regulators, clocks and bus frequencies. The PMIC regulators and root clocks in these platforms are only accessible via the RPM, so to get access to these we need the full chain of smem, smd, rpm and a regulator driver implemented. And that is exactly what this series provides. A key outstanding question is where in the tree we should put the implementation, for now I dropped them in drivers/soc/qcom but that's only because I don't know where to put it otherwise. I have not found any equivalent of the SMEM driver, SMD resembles mailbox and rpmsg - but comments in that patch on why it's neither. RPM is a mfd and regulator is a regulator :) Part from the rpm regulators I've tested this by hacking up a firmware loader and making some adoptions to the wcn36xx WiFi driver and I can indeed communicate with this system as well. Missing for that part is the coupling with remoteproc to reset smd channels when a remote system goes down. But that is indeed a separate set of patches. Bjorn Andersson (7): soc: qcom: Add device tree binding for SMEM soc: qcom: Add device tree binding for SMD mfd: devicetree: bindings: Add Qualcomm SMD based RPM DT binding soc: qcom: Add Shared Memory Manager driver soc: qcom: Add Shared Memory Driver mfd: qcom-smd-rpm: Driver for the Qualcomm RPM over SMD regulator: qcom-smd-rpm: Regulator driver for the Qualcomm RPM .../devicetree/bindings/mfd/qcom-rpm-smd.txt | 122 +++ .../devicetree/bindings/soc/qcom/qcom,smd.txt | 82 ++ .../devicetree/bindings/soc/qcom/qcom,smem.txt | 34 + drivers/mfd/Kconfig | 14 + drivers/mfd/Makefile | 1 + drivers/mfd/qcom-smd-rpm.c | 299 ++++++ drivers/regulator/Kconfig | 12 + drivers/regulator/Makefile | 1 + drivers/regulator/qcom_smd-regulator.c | 229 +++++ drivers/soc/qcom/Kconfig | 16 + drivers/soc/qcom/Makefile | 2 + drivers/soc/qcom/qcom_smd.c | 1043 ++++++++++++++++++++ drivers/soc/qcom/qcom_smem.c | 328 ++++++ include/dt-bindings/mfd/qcom-rpm.h | 36 + include/linux/mfd/qcom-smd-rpm.h | 9 + include/linux/soc/qcom/qcom_smd.h | 47 + include/linux/soc/qcom/qcom_smem.h | 14 + 17 files changed, 2289 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/qcom-rpm-smd.txt create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt create mode 100644 drivers/mfd/qcom-smd-rpm.c create mode 100644 drivers/regulator/qcom_smd-regulator.c create mode 100644 drivers/soc/qcom/qcom_smd.c create mode 100644 drivers/soc/qcom/qcom_smem.c create mode 100644 include/linux/mfd/qcom-smd-rpm.h create mode 100644 include/linux/soc/qcom/qcom_smd.h create mode 100644 include/linux/soc/qcom/qcom_smem.h -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
