linux-kernel - Re: [PATCH v2 2/4] usb: ucsi: glink: use the connector orientation GPIO to provide switch events

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Date:   Mon, 2 Oct 2023 12:27:15 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.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
Subject: Re: [PATCH v2 2/4] usb: ucsi: glink: use the connector orientation
 GPIO to provide switch events



On 10/2/23 12:20, Neil Armstrong wrote:
> On SM8550, the non-altmode orientation is not given anymore within
> altmode events, even with USB SVIDs events.
> 
> On the other side, the Type-C connector orientation is correctly
> reported by a signal from the PMIC.
> 
> Take this gpio signal when we detect some Type-C port activity
> to notify any Type-C switches tied to the Type-C port connectors.
> 
> Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
[...]

> +	device_for_each_child_node(dev, fwnode) {
> +		struct gpio_desc *desc;
> +		u32 port;
> +
> +		ret = fwnode_property_read_u32(fwnode, "reg", &port);
> +		if (ret < 0) {
> +			dev_err(dev, "missing reg property of %pOFn\n", fwnode);
> +			return ret;
> +		}
> +
> +		if (port >= PMIC_GLINK_MAX_PORTS) {
> +			dev_warn(dev, "invalid connector number, ignoring\n");
> +			continue;
> +		}
> +
> +		desc = devm_gpiod_get_index_optional(&adev->dev, "orientation", port, GPIOD_IN);
Personally, I'd add a comment about this being a lookup on the 
pmic-glink node, as dev is reused throughout this function

Acked-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad