Re: [PATCH v7 5/5] leds: mt6360: Add LED driver for MT6360

From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Gene Chen <gene.chen.richtek@gmail.com>,
	pavel@ucw.cz, robh+dt@kernel.org, matthias.bgg@gmail.com
Cc: dmurphy@ti.com, linux-leds@vger.kernel.org,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	gene_chen@richtek.com, Wilma.Wu@mediatek.com,
	shufan_lee@richtek.com, cy_huang@richtek.com,
	benjamin.chao@mediatek.com
Subject: Re: [PATCH v7 5/5] leds: mt6360: Add LED driver for MT6360
Date: Thu, 19 Nov 2020 23:55:59 +0100	[thread overview]
Message-ID: <f36fbe3a-1857-081a-a9c8-9ddf9769298c@gmail.com> (raw)
In-Reply-To: <1605696462-391-6-git-send-email-gene.chen.richtek@gmail.com>

Hi Gene,

On 11/18/20 11:47 AM, Gene Chen wrote:
> From: Gene Chen <gene_chen@richtek.com>
> 
> Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> 3-channel RGB LED support Register/Flash/Breath Mode, and 1-channel for
> moonlight LED.
> 
> Signed-off-by: Gene Chen <gene_chen@richtek.com>
> ---
>   drivers/leds/Kconfig       |  13 +
>   drivers/leds/Makefile      |   1 +
>   drivers/leds/leds-mt6360.c | 808 +++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 822 insertions(+)
>   create mode 100644 drivers/leds/leds-mt6360.c
> 
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 1c181df..4f533bc 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -271,6 +271,19 @@ config LEDS_MT6323
>   	  This option enables support for on-chip LED drivers found on
>   	  Mediatek MT6323 PMIC.
>   
> +config LEDS_MT6360
> +	tristate "LED Support for Mediatek MT6360 PMIC"
> +	depends on LEDS_CLASS && OF
> +	depends on LEDS_CLASS_FLASH || !LEDS_CLASS_FLASH
> +	depends on LEDS_CLASS_MULTICOLOR || !LEDS_CLASS_MULTICOLOR
> +	depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
> +	depends on MFD_MT6360
> +	help
> +	  This option enables support for dual Flash LED drivers found on
> +	  Mediatek MT6360 PMIC.
> +	  Independent current sources supply for each flash LED support torch
> +	  and strobe mode.
> +
>   config LEDS_S3C24XX
>   	tristate "LED Support for Samsung S3C24XX GPIO LEDs"
>   	depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index c2c7d7a..5596427 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -66,6 +66,7 @@ obj-$(CONFIG_LEDS_MIKROTIK_RB532)	+= leds-rb532.o
>   obj-$(CONFIG_LEDS_MLXCPLD)		+= leds-mlxcpld.o
>   obj-$(CONFIG_LEDS_MLXREG)		+= leds-mlxreg.o
>   obj-$(CONFIG_LEDS_MT6323)		+= leds-mt6323.o
> +obj-$(CONFIG_LEDS_MT6360)		+= leds-mt6360.o
>   obj-$(CONFIG_LEDS_NET48XX)		+= leds-net48xx.o
>   obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
>   obj-$(CONFIG_LEDS_NIC78BX)		+= leds-nic78bx.o
> diff --git a/drivers/leds/leds-mt6360.c b/drivers/leds/leds-mt6360.c
> new file mode 100644
> index 0000000..8432901
> --- /dev/null
> +++ b/drivers/leds/leds-mt6360.c
> @@ -0,0 +1,808 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
[...]
> +static int mt6360_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +	u16 fled_stat;
> +	unsigned int chg_stat, strobe_timeout_mask, fled_short_mask;
> +	u32 rfault = 0;
> +	int ret;

You need mutex here as well because you're making two readouts and
you have to assure atomicity of this operation.

> +	ret = regmap_read(priv->regmap, MT6360_REG_CHGSTAT2, &chg_stat);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_raw_read(priv->regmap, MT6360_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
> +	if (ret)
> +		return ret;
> +
> +	if (led->led_no == MT6360_LED_FLASH1) {
> +		strobe_timeout_mask = MT6360_FLED1STRBTO_MASK;
> +		fled_short_mask = MT6360_FLED1SHORT_MASK;
> +	} else {
> +		strobe_timeout_mask = MT6360_FLED2STRBTO_MASK;
> +		fled_short_mask = MT6360_FLED2SHORT_MASK;
> +	}
> +
> +	if (chg_stat & MT6360_FLEDCHGVINOVP_MASK)
> +		rfault |= LED_FAULT_INPUT_VOLTAGE;
> +
> +	if (fled_stat & strobe_timeout_mask)
> +		rfault |= LED_FAULT_TIMEOUT;
> +
> +	if (fled_stat & fled_short_mask)
> +		rfault |= LED_FAULT_SHORT_CIRCUIT;
> +
> +	if (fled_stat & MT6360_FLEDLVF_MASK)
> +		rfault |= LED_FAULT_UNDER_VOLTAGE;
> +
> +	*fault = rfault;
> +	return 0;
> +}
> +
[...]

-- 
Best regards,
Jacek Anaszewski