linux-kernel - Re: [PATCH v3 3/3] arm64: dts: qcom: sdm845-mtp: Add nodes for USB

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Date:   Fri, 24 Aug 2018 09:13:37 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <andy.gross@...aro.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>, tfiga@...omium.org,
        Manu Gautam <mgautam@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Mark Rutland <mark.rutland@....com>, linux-soc@...r.kernel.org
Subject: Re: [PATCH v3 3/3] arm64: dts: qcom: sdm845-mtp: Add nodes for USB

Quoting Douglas Anderson (2018-08-22 10:36:29)
> Set the various nodes to "okay" and hook up the regulators.
> 
> NOTE: For now the main USB port (the one that goes out the Type C
> connector) is forced to host.  Eventually someone will need to get the
> Type C detection hooked up and get this all integrated with the
> PMI8998 PMIC.  The reason for forcing to "host" in the meantime is
> that this will leave us with one "host" and one "peripheral" port.
> 
> In order for host mode this to work, we assume that the bootloader
> left things configured enough for us.  Apparently the magic for that
> is is to do these writes on pmi8998:
> - pm_comm_write_byte(2, 0x1153, 0x2C, 0);
> - pm_comm_write_byte(2, 0x1152, 0x07, 0);
> - pm_comm_write_byte(2, 0x1140, 0x00, 0);
> - pm_comm_write_byte(2, 0x1140, 0x01, 0);
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>