Add interconnect driver for SDX55

From:		Manivannan Sadhasivam <manivannan.sadhasivam-AT-linaro.org>
To:		georgi.djakov-AT-linaro.org, robh+dt-AT-kernel.org
Subject:		[PATCH v2 0/2] Add interconnect driver for SDX55
Date:		Thu, 21 Jan 2021 11:02:52 +0530
Message-ID:		<20210121053254.8355-1-manivannan.sadhasivam@linaro.org>
Cc:		agross-AT-kernel.org, bjorn.andersson-AT-linaro.org, linux-arm-msm-AT-vger.kernel.org, linux-pm-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, devicetree-AT-vger.kernel.org, okukatla-AT-codeaurora.org, Manivannan Sadhasivam <manivannan.sadhasivam-AT-linaro.org>
Archive-link:		Article

Hello Georgi,

This small series adds interconnect driver support for SDX55 platform for
scaling the bandwidth requirements over RPMh. The driver has been tested
on SDX55-MTP and gives below DDR metrics using mbw [1] tool:

Src port: SDX55_MASTER_AMPSS_M0
Dest port: SDX55_SLAVE_EBI_CH0

Command: mbw 100

With bandwidth 500000:
AVG     Method: MEMCPY  Elapsed: 0.59058        MiB: 100.00000  Copy: 169.324 MiB/s
With bandwidth 700000:
AVG     Method: MEMCPY  Elapsed: 0.29267        MiB: 100.00000  Copy: 341.678 MiB/s
With bandwidth 900000:
AVG     Method: MEMCPY  Elapsed: 0.19608        MiB: 100.00000  Copy: 510.005 MiB/s

The copy speed seems to be the same for all bandwidth less than 500000 and
greater than 900000.

Note: The CPUFreq governer needs to be set to something other than schedutil to
see the difference. Otherwise the speed seems to be the same for all bandwidth.

Thanks,
Mani

[1] https://github.com/raas/mbw

Changes in v2:

* Changed the copyright year to 2021, fixed Kconfig dependency and constified
  provider struct definitions.

Manivannan Sadhasivam (2):
  dt-bindings: interconnect: Add Qualcomm SDX55 DT bindings
  interconnect: qcom: Add SDX55 interconnect provider driver

 .../bindings/interconnect/qcom,rpmh.yaml      |   4 +
 drivers/interconnect/qcom/Kconfig             |   9 +
 drivers/interconnect/qcom/Makefile            |   2 +
 drivers/interconnect/qcom/sdx55.c             | 356 ++++++++++++++++++
 drivers/interconnect/qcom/sdx55.h             |  70 ++++
 include/dt-bindings/interconnect/qcom,sdx55.h |  76 ++++
 6 files changed, 517 insertions(+)
 create mode 100644 drivers/interconnect/qcom/sdx55.c
 create mode 100644 drivers/interconnect/qcom/sdx55.h
 create mode 100644 include/dt-bindings/interconnect/qcom,sdx55.h

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2.25.1