linux-kernel - [PATCH v2 0/4] arm64: qcom: sm8550: retrieve USB-C port orientation from gpio

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Date:   Mon, 02 Oct 2023 12:20:20 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v2 0/4] arm64: qcom: sm8550: retrieve USB-C port
 orientation from gpio

This patchset is derived from [1], with only the GPIO orientation.

On the SM8550 platform, the PMIC Glink firmware doesn't emit
ALTMODE events for all USB-C port changes like it was done
for older platforms (like SM8450).
This means we only have a valid orientation when an Altmode
compliant device is inserted, but not for all the other devices,
including USB cables, dongles and non-altmode Hubs.

But the actual orientation is shared by the PM8550B by
a signal called CC_OUT which can be read on a gpio of the SM8550
SoC.

Let's add support for this feature by using the UCSI PMIC
Glink driver events to read and dispatch the orientation
to the USB-C connector devices on the DT graph.

While everybody would prefer having a proper PMIC Glink event
for an orientation change, this is not implemented and not
planned for future platforms either.

[1] https://lore.kernel.org/all/20230601-topic-sm8550-upstream-type-c-v3-0-22c9973012b6@linaro.org/

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
Changes in v2:
- Update bindings property description to describe how multi-port is handled
- Link to v1: https://lore.kernel.org/r/20230804-topic-sm8550-upstream-type-c-orientation-v1-0-36dd3edec7bf@linaro.org

---
Neil Armstrong (4):
      dt-bindings: soc: qcom: qcom,pmic-glink: add a gpio used to determine the Type-C port plug orientation
      usb: ucsi: glink: use the connector orientation GPIO to provide switch events
      arm64: dts: qcom: sm8550-mtp: add orientation gpio
      arm64: dts: qcom: sm8550-qrd: add orientation gpio

 .../bindings/soc/qcom/qcom,pmic-glink.yaml         | 19 ++++++++
 arch/arm64/boot/dts/qcom/sm8550-mtp.dts            |  1 +
 arch/arm64/boot/dts/qcom/sm8550-qrd.dts            |  1 +
 drivers/usb/typec/ucsi/ucsi_glink.c                | 54 +++++++++++++++++++++-
 4 files changed, 74 insertions(+), 1 deletion(-)
---
base-commit: df964ce9ef9fea10cf131bf6bad8658fde7956f6
change-id: 20230804-topic-sm8550-upstream-type-c-orientation-0bbbb360d3f7

Best regards,
-- 
Neil Armstrong <neil.armstrong@...aro.org>