From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: ChiaEn Wu <peterwu.pub@gmail.com>
Cc: "open list:FRAMEBUFFER LAYER" <linux-fbdev@vger.kernel.org>,
"Krogerus, Heikki" <heikki.krogerus@linux.intel.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Alice Chen <alice_chen@richtek.com>,
linux-iio <linux-iio@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Liam Girdwood <lgirdwood@gmail.com>,
cy_huang <cy_huang@richtek.com>, Pavel Machek <pavel@ucw.cz>,
Lee Jones <lee.jones@linaro.org>,
Linux LED Subsystem <linux-leds@vger.kernel.org>,
Daniel Thompson <daniel.thompson@linaro.org>,
Helge Deller <deller@gmx.de>, Rob Herring <robh+dt@kernel.org>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
Guenter Roeck <linux@roeck-us.net>,
devicetree <devicetree@vger.kernel.org>,
Linux PM <linux-pm@vger.kernel.org>,
szuni chen <szunichen@gmail.com>, Mark Brown <broonie@kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
Jingoo Han <jingoohan1@gmail.com>,
USB <linux-usb@vger.kernel.org>,
Sebastian Reichel <sre@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
ChiaEn Wu <chiaen_wu@richtek.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jonathan Cameron <jic23@kernel.org>
Subject: Re: [PATCH v6 13/13] video: backlight: mt6370: Add MediaTek MT6370 support
Date: Mon, 25 Jul 2022 11:07:35 +0200 [thread overview]
Message-ID: <CAHp75VfxeRR7BzOWwfNSo+x3JZcH37ogR+ZbapTAWrCYkr+FUg@mail.gmail.com> (raw)
In-Reply-To: <20220722102407.2205-14-peterwu.pub@gmail.com>
On Fri, Jul 22, 2022 at 12:25 PM ChiaEn Wu <peterwu.pub@gmail.com> wrote:
>
> From: ChiaEn Wu <chiaen_wu@richtek.com>
>
> MediaTek MT6370 is a SubPMIC consisting of a single cell battery charger
> with ADC monitoring, RGB LEDs, dual channel flashlight, WLED backlight
> driver, display bias voltage supply, one general purpose LDO, and the
> USB Type-C & PD controller complies with the latest USB Type-C and PD
> standards.
>
> This adds support for MediaTek MT6370 Backlight driver. It's commonly used
Read Submitting Patches, please!
(In this case, find "This patch" in the above mentioned document, read
and act accordingly)
> to drive the display WLED. There are 4 channels inside, and each channel
> supports up to 30mA of current capability with 2048 current steps in
> exponential or linear mapping curves.
...
> + brightness_val[1] = (brightness - 1) >> fls(MT6370_BL_DIM2_MASK);
(see below)
...
> + /*
> + * To make MT6372 using 14 bits to control the brightness
> + * backward compatible with 11 bits brightness control
> + * (like MT6370 and MT6371 do), we left shift the value
> + * and pad with 1 to remaining bits. Hence, the MT6372's
to the remaining
> + * backlight brightness will be almost the same as MT6370's
> + * and MT6371's.
> + */
> + if (priv->vid_type == MT6370_VID_6372) {
> + brightness_val[0] <<= MT6370_BL_DIM2_6372_SHIFT;
> + brightness_val[0] |= MT6370_BL_DUMMY_6372_MASK;
> + }
Nice! Why not...
...
> + gpiod_set_value(priv->enable_gpio, brightness ? 1 : 0);
!!brightness will do as well.
...
> + brightness = brightness_val[1] << fls(MT6370_BL_DIM2_MASK);
> + val |= prop_val << (ffs(MT6370_BL_PWM_HYS_SEL_MASK) - 1);
> + val |= ovp_uV << (ffs(MT6370_BL_OVP_SEL_MASK) - 1);
> + val |= ocp_uA << (ffs(MT6370_BL_OC_SEL_MASK) - 1);
> + val = prop_val << (ffs(MT6370_BL_CH_MASK) - 1);
...to use respective _SHIFTs in all these?
...
> + priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(priv->enable_gpio))
> + dev_err(dev, "Failed to get 'enable' gpio\n");
What does this mean? Shouldn't be
return dev_err_probe()?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-07-25 9:08 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-22 10:23 [PATCH v6 00/13] Add MediaTek MT6370 PMIC support ChiaEn Wu
2022-07-22 10:23 ` [PATCH v6 01/13] dt-bindings: usb: Add MediaTek MT6370 TCPC ChiaEn Wu
2022-07-22 10:23 ` [PATCH v6 02/13] dt-bindings: power: supply: Add MediaTek MT6370 Charger ChiaEn Wu
2022-07-22 10:23 ` [PATCH v6 03/13] dt-bindings: leds: mt6370: Add MediaTek MT6370 current sink type LED indicator ChiaEn Wu
2022-07-22 10:23 ` [PATCH v6 04/13] dt-bindings: leds: Add MediaTek MT6370 flashlight ChiaEn Wu
2022-07-30 21:30 ` Pavel Machek
2022-07-22 10:23 ` [PATCH v6 05/13] dt-bindings: backlight: Add MediaTek MT6370 backlight ChiaEn Wu
2022-07-22 10:24 ` [PATCH v6 06/13] dt-bindings: mfd: Add MediaTek MT6370 ChiaEn Wu
2022-07-22 10:24 ` [PATCH v6 07/13] mfd: mt6370: Add MediaTek MT6370 support ChiaEn Wu
2022-07-25 7:59 ` Andy Shevchenko
2022-07-25 8:29 ` ChiaEn Wu
2022-07-25 8:43 ` Andy Shevchenko
2022-07-25 9:06 ` ChiaEn Wu
2022-07-25 9:09 ` Andy Shevchenko
2022-07-22 10:24 ` [PATCH v6 08/13] usb: typec: tcpci_mt6370: Add MediaTek MT6370 tcpci driver ChiaEn Wu
2022-07-22 14:19 ` Guenter Roeck
2022-07-25 7:06 ` Chunfeng Yun
2022-07-25 7:17 ` ChiaEn Wu
2022-07-25 8:03 ` Andy Shevchenko
2022-07-22 10:24 ` [PATCH v6 09/13] iio: adc: mt6370: Add MediaTek MT6370 support ChiaEn Wu
2022-07-25 8:10 ` Andy Shevchenko
2022-07-22 10:24 ` [PATCH v6 10/13] power: supply: mt6370: Add MediaTek MT6370 charger driver ChiaEn Wu
2022-07-25 8:25 ` Andy Shevchenko
2022-07-22 10:24 ` [PATCH v6 11/13] leds: rgb: mt6370: Add MediaTek MT6370 current sink type LED Indicator support ChiaEn Wu
2022-07-22 10:52 ` AngeloGioacchino Del Regno
2022-07-25 8:40 ` Andy Shevchenko
2022-07-26 11:45 ` ChiaEn Wu
2022-07-26 12:17 ` Andy Shevchenko
2022-07-27 7:36 ` ChiaEn Wu
2022-07-27 10:03 ` Andy Shevchenko
2022-07-30 21:39 ` Pavel Machek
2022-07-22 10:24 ` [PATCH v6 12/13] leds: flash: mt6370: Add MediaTek MT6370 flashlight support ChiaEn Wu
2022-07-22 10:48 ` AngeloGioacchino Del Regno
2022-07-25 8:51 ` Andy Shevchenko
2022-07-29 6:17 ` szuni chen
2022-07-29 10:34 ` Andy Shevchenko
2022-07-25 8:55 ` Andy Shevchenko
2022-07-26 4:15 ` szuni chen
2022-07-26 6:10 ` Andy Shevchenko
2022-07-30 21:42 ` Pavel Machek
2022-08-04 9:53 ` Alice Chen
2022-07-22 10:24 ` [PATCH v6 13/13] video: backlight: mt6370: Add MediaTek MT6370 support ChiaEn Wu
2022-07-25 9:07 ` Andy Shevchenko [this message]
2022-07-25 10:31 ` Daniel Thompson
2022-07-26 2:20 ` ChiaEn Wu
2022-07-26 9:30 ` Daniel Thompson
2022-07-26 11:28 ` ChiaEn Wu
2022-07-26 11:59 ` Daniel Thompson
2022-07-27 6:24 ` ChiaEn Wu
2022-07-28 11:31 ` Daniel Thompson
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