linux-kernel - [PATCH v2 0/2] Add support for Qualcomm QCA639x chips family

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Date:   Wed, 13 Jan 2021 19:00:51 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] Add support for Qualcomm QCA639x chips family

Qualcomm QCA639x is a family of WiFi + Bluetooth chips, with BT part
being controlled through the UART and WiFi being present on PCIe
bus. Both blocks share common power sources wich should be turned on
before either of devices can be probed. Declare common 'qca639x' driver
providing a power domain to be used by both BT and WiFi parts.

While it would be easy to just add power supplies to BT device tree
node, for WiFi it is not that easy. The chip has to be powered on before
the PCIe bus is probed (otherwise it will be left undetected). Adding
power supplies to the PCIe device nodes would require changes to the
host controller driver. Thus it is supposed to be simpler to provide
power domain via separate driver.

Changes since v1:
 - Moved the driver from drivers/mfd to drivers/misc
 - Fixed compatibility string in device binding
 - Removed debug messages