linux-kernel - Re: [PATCH v8 1/2] leds: flash: add driver to support flash LED module in QCOM PMICs

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Message-ID: <ZB8wbv93+Vmx3trt@duo.ucw.cz>
Date:   Sat, 25 Mar 2023 18:33:34 +0100
From:   Pavel Machek <pavel@....cz>
To:     Fenglin Wu <quic_fenglinw@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        lee@...nel.org, krzysztof.kozlowski@...aro.org,
        linux-leds@...r.kernel.org, quic_collinsd@...cinc.com,
        quic_subbaram@...cinc.com, Luca Weiss <luca.weiss@...rphone.com>
Subject: Re: [PATCH v8 1/2] leds: flash: add driver to support flash LED
 module in QCOM PMICs

Hi!

> 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.


> +static int qcom_flash_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
> +{
> +	struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev);
> +	int rc;
> +
> +	rc = set_flash_current(led, led->flash_current_ma, FLASH_MODE);
> +	if (rc)
> +		return rc;
> +
> +	rc = set_flash_timeout(led, led->flash_timeout_ms);
> +	if (rc)
> +		return rc;
> +
> +	rc = set_flash_module_en(led, state);
> +	if (rc)
> +		return rc;
> +
> +	return set_flash_strobe(led, SW_STROBE, state);
> +}

Should we disable the module before setting the current? It might be
already active due to torch mode...


> +		return -EINVAL;
> +	}
> +
> +	flash_data->v4l2_flash = devm_kcalloc(dev, count,
> +			sizeof(*flash_data->v4l2_flash), GFP_KERNEL);
> +	if (!flash_data->v4l2_flash)
> +		return -ENOMEM;
> +
> +	device_for_each_child_node(dev, child) {
> +		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
> +		if (!led) {
> +			rc = -ENOMEM;
> +			goto release;
> +		}
> +
> +		led->flash_data = flash_data;
> +		rc = qcom_flash_register_led_device(dev, child, led);
> +		if (rc < 0)
> +			goto release;
> +
> +		flash_data->leds_count++;
> +	}

Do you need to do of_node_put in error paths?

BR,
							Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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