linux-kernel - Re: [PATCH] usb: typec: mux: fsa4480: add regulator support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z_g-Hl-G9IwRZmqF@pengutronix.de>
Date: Thu, 10 Apr 2025 23:54:38 +0200
From: Michael Grzeschik <mgr@...gutronix.de>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH] usb: typec: mux: fsa4480: add regulator support

On Tue, Apr 08, 2025 at 03:18:14PM +0300, Dmitry Baryshkov wrote:
>On Fri, Apr 04, 2025 at 01:02:20AM +0200, Michael Grzeschik wrote:
>> The fsa4480 vcc lane could be driven by some external regulator.
>> This patch is adding support to enable the regulator before probing.
>>
>> Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
>> ---
>>  drivers/usb/typec/mux/fsa4480.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/usb/typec/mux/fsa4480.c b/drivers/usb/typec/mux/fsa4480.c
>> index f71dba8bf07c9..c54e42c7e6a16 100644
>> --- a/drivers/usb/typec/mux/fsa4480.c
>> +++ b/drivers/usb/typec/mux/fsa4480.c
>> @@ -12,6 +12,7 @@
>>  #include <linux/regmap.h>
>>  #include <linux/usb/typec_dp.h>
>>  #include <linux/usb/typec_mux.h>
>> +#include <linux/regulator/consumer.h>
>>
>>  #define FSA4480_DEVICE_ID	0x00
>>   #define FSA4480_DEVICE_ID_VENDOR_ID	GENMASK(7, 6)
>> @@ -273,6 +274,10 @@ static int fsa4480_probe(struct i2c_client *client)
>>  	if (IS_ERR(fsa->regmap))
>>  		return dev_err_probe(dev, PTR_ERR(fsa->regmap), "failed to initialize regmap\n");
>>
>> +	ret = devm_regulator_get_enable_optional(dev, "vcc");
>
>Missing DT bindings update that describes this supply.

Looking into "Documentation/devicetree/bindings/usb/fcs,fsa4480.yaml" it
seems vcc-supply is alread documented. Is more needed?

>> +	if (ret && ret != -ENODEV)
>> +		return dev_err_probe(dev, ret, "Failed to get regulator\n");
>> +
>>  	ret = regmap_read(fsa->regmap, FSA4480_DEVICE_ID, &val);
>>  	if (ret)
>>  		return dev_err_probe(dev, -ENODEV, "FSA4480 not found\n");
>>
>> ---
>> base-commit: a1b5bd45d4ee58af4f56e49497b8c3db96d8f8a3
>> change-id: 20250404-ml-topic-typec-mux-fs4480-392407f94f84
>>
>> Best regards,
>> --
>> Michael Grzeschik <m.grzeschik@...gutronix.de>
>>
>
>-- 
>With best wishes
>Dmitry
>

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)