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Date: Tue, 14 Jun 2022 09:57:29 -0700
From: Prashant Malani <pmalani@...omium.org>
To: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
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
On Tue, Jun 14, 2022 at 1:18 AM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> 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;
> }
May I ask why? We're not missing any return paths. I would rather we
keep it as is (which has the valid return value).
>
> > +
> > + 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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