linux-kernel - Re: [PATCH v4 1/2] leds: flash: add driver to support flash LED module in QCOM PMICs

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Message-ID: <a189c320-336e-be8e-2b89-dcb2b0664117@quicinc.com>
Date:   Tue, 1 Nov 2022 13:11:00 +0800
From:   Fenglin Wu <quic_fenglinw@...cinc.com>
To:     Luca Weiss <luca.weiss@...rphone.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <krzysztof.kozlowski@...aro.org>, "Pavel Machek" <pavel@....cz>,
        Gene Chen <gene_chen@...htek.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        <linux-leds@...r.kernel.org>
CC:     <quic_collinsd@...cinc.com>, <quic_subbaram@...cinc.com>,
        Dylan Van Assche <me@...anvanassche.be>
Subject: Re: [PATCH v4 1/2] leds: flash: add driver to support flash LED
 module in QCOM PMICs



On 2022/10/31 21:56, Luca Weiss wrote:
> Hi Fenglin,
> 
> On Tue Oct 25, 2022 at 9:38 AM CEST, Fenglin Wu wrote:
>> Add initial driver to support flash LED module found in Qualcomm
>> Technologies, Inc. PMICs. The flash module can have 3 or 4 channels
>> and each channel can be controlled indepedently and support full scale
>> current up to 1.5 A. It also supports connecting two channels together
>> to supply one LED component with full scale current up to 2 A. In that
>> case, the current will be split on each channel symmetrically and the
>> channels will be enabled and disabled at the same time.
>>
>> Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
>> Tested-by: Luca Weiss <luca.weiss@...rphone.com> # sm7225-fairphone-fp4 + pm6150l
>> ---
>>   drivers/leds/flash/Kconfig           |  15 +
>>   drivers/leds/flash/Makefile          |   1 +
>>   drivers/leds/flash/leds-qcom-flash.c | 700 +++++++++++++++++++++++++++
>>   3 files changed, 716 insertions(+)
>>   create mode 100644 drivers/leds/flash/leds-qcom-flash.c
>>
> 
> <snip>
> 
>> +static const struct of_device_id qcom_flash_led_match_table[] = {
>> +	{ .compatible = "qcom,spmi-flash-led" },
>> +	{ }
>> +};
> 
> Dylan has noticed that auto-loading the module based on dt match doesn't
> work currently. It seems that this line is missing here to enable that:
> 
>    MODULE_DEVICE_TABLE(of, qcom_flash_led_match_table);
> 
> Please add it for v5!
> 
> Regards
> Luca
> 
Will add it for v5, thank you!

>> +
>> +static struct platform_driver qcom_flash_led_driver = {
>> +	.driver = {
>> +		.name = "leds-qcom-flash",
>> +		.of_match_table = qcom_flash_led_match_table,
>> +	},
>> +	.probe = qcom_flash_led_probe,
>> +	.remove = qcom_flash_led_remove,
>> +};
>> +
>> +module_platform_driver(qcom_flash_led_driver);
>> +
>> +MODULE_DESCRIPTION("QCOM Flash LED driver");
>> +MODULE_LICENSE("GPL");
>> -- 
>> 2.25.1
>