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SubjectRe: [PATCH v2 6/7] drm/bridge: anx7625: Register Type-C mode switches
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Il 14/06/22 18:57, Prashant Malani ha scritto:
> On Tue, Jun 14, 2022 at 1:18 AM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@collabora.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@chromium.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).
>

I know that you're not missing any return paths.

That's only because the proposed one is a common pattern in the kernel
and it's only for consistency.

Regards,
Angelo

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