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Date: Tue, 14 Jun 2022 10:18:31 +0200
From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
To: Prashant Malani <pmalani@...omium.org>,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc: heikki.krogerus@...ux.intel.com,
Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <narmstrong@...libre.com>,
David Airlie <airlied@...ux.ie>,
"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Sam Ravnborg <sam@...nborg.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Nícolas F. R. A. Prado
<nfraprado@...labora.com>, Jonas Karlman <jonas@...boo.se>,
swboyd@...omium.org, Pin-Yen Lin <treapking@...omium.org>,
Rob Herring <robh+dt@...nel.org>,
Maxime Ripard <maxime@...no.tech>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Xin Ji <xji@...logixsemi.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Robert Foss <robert.foss@...aro.org>,
José Expósito <jose.exposito89@...il.com>
Subject: Re: [PATCH v2 6/7] drm/bridge: anx7625: Register Type-C mode switches
Il 09/06/22 20:09, Prashant Malani ha scritto:
> When the DT node has "switches" available, register a Type-C mode-switch
> for each listed "switch". This allows the driver to receive state
> information about what operating mode a Type-C port and its connected
> peripherals are in, as well as status information (like VDOs) related to
> that state.
>
> The callback function is currently a stub, but subsequent patches will
> implement the required functionality.
>
> Signed-off-by: Prashant Malani <pmalani@...omium.org>
> ---
>
> Changes since v2:
> - No changes.
>
> drivers/gpu/drm/bridge/analogix/anx7625.c | 73 +++++++++++++++++++++++
> drivers/gpu/drm/bridge/analogix/anx7625.h | 6 ++
> 2 files changed, 79 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> index 07ed44c6b839..d41a21103bd3 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> @@ -15,6 +15,7 @@
> #include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> #include <linux/types.h>
> +#include <linux/usb/typec_mux.h>
> #include <linux/workqueue.h>
>
> #include <linux/of_gpio.h>
> @@ -2581,9 +2582,59 @@ static void anx7625_runtime_disable(void *data)
> pm_runtime_disable(data);
> }
>
> +static int anx7625_typec_mux_set(struct typec_mux_dev *mux,
> + struct typec_mux_state *state)
> +{
> + return 0;
> +}
> +
> +static int anx7625_register_mode_switch(struct device *dev, struct device_node *node,
> + struct anx7625_data *ctx)
> +{
> + struct anx7625_port_data *port_data;
> + struct typec_mux_desc mux_desc = {};
> + char name[32];
> + u32 port_num;
> + int ret;
> +
> + ret = of_property_read_u32(node, "reg", &port_num);
> + if (ret)
> + return ret;
> +
> + if (port_num >= ctx->num_typec_switches) {
> + dev_err(dev, "Invalid port number specified: %d\n", port_num);
> + return -EINVAL;
> + }
> +
> + port_data = &ctx->typec_ports[port_num];
> + port_data->ctx = ctx;
> + mux_desc.fwnode = &node->fwnode;
> + mux_desc.drvdata = port_data;
> + snprintf(name, sizeof(name), "%s-%u", node->name, port_num);
> + mux_desc.name = name;
> + mux_desc.set = anx7625_typec_mux_set;
> +
> + port_data->typec_mux = typec_mux_register(dev, &mux_desc);
> + if (IS_ERR(port_data->typec_mux)) {
> + ret = PTR_ERR(port_data->typec_mux);
> + dev_err(dev, "Mode switch register for port %d failed: %d", port_num, ret);
> + }
Please return 0 at the end of this function.
if (IS_ERR(....)) {
......code......
return ret;
}
return 0;
}
> +
> + return ret;
> +}
> +
> +static void anx7625_unregister_typec_switches(struct anx7625_data *ctx)
> +{
> + int i;
> +
> + for (i = 0; i < ctx->num_typec_switches; i++)
> + typec_mux_unregister(ctx->typec_ports[i].typec_mux);
> +}
> +
> static int anx7625_register_typec_switches(struct device *device, struct anx7625_data *ctx)
> {
> struct device_node *of = NULL;
> + struct device_node *sw;
> int ret = 0;
>
> of = of_get_child_by_name(device->of_node, "switches");
> @@ -2594,6 +2645,26 @@ static int anx7625_register_typec_switches(struct device *device, struct anx7625
> if (ctx->num_typec_switches <= 0)
> return -ENODEV;
>
> + ctx->typec_ports = devm_kzalloc(device,
> + ctx->num_typec_switches * sizeof(struct anx7625_port_data),
> + GFP_KERNEL);
> + if (!ctx->typec_ports)
> + return -ENOMEM;
> +
> + /* Register switches for each connector. */
> + for_each_available_child_of_node(of, sw) {
> + if (!of_property_read_bool(sw, "mode-switch"))
> + continue;
> + ret = anx7625_register_mode_switch(device, sw, ctx);
> + if (ret) {
> + dev_err(device, "Failed to register mode switch: %d\n", ret);
> + break;
> + }
> + }
> +
> + if (ret)
> + anx7625_unregister_typec_switches(ctx);
> +
> return ret;
> }
>
> @@ -2759,6 +2830,8 @@ static int anx7625_i2c_remove(struct i2c_client *client)
>
> drm_bridge_remove(&platform->bridge);
>
> + anx7625_unregister_typec_switches(platform);
> +
> if (platform->pdata.intp_irq)
> destroy_workqueue(platform->workqueue);
>
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
> index d5cbca708842..76cfc64f7574 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.h
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
> @@ -443,6 +443,11 @@ struct anx7625_i2c_client {
> struct i2c_client *tcpc_client;
> };
>
> +struct anx7625_port_data {
> + struct typec_mux_dev *typec_mux;
> + struct anx7625_data *ctx;
> +};
> +
> struct anx7625_data {
> struct anx7625_platform_data pdata;
> struct platform_device *audio_pdev;
> @@ -474,6 +479,7 @@ struct anx7625_data {
> struct mipi_dsi_device *dsi;
> struct drm_dp_aux aux;
> int num_typec_switches;
> + struct anx7625_port_data *typec_ports;
> };
>
> #endif /* __ANX7625_H__ */
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