Re: [V8, 1/2] media: dt-bindings: media: i2c: Document OV02A10 bindings

From: Tomasz Figa <tfiga@chromium.org>
To: Rob Herring <robh@kernel.org>
Cc: Dongchun Zhu <dongchun.zhu@mediatek.com>,
	linus.walleij@linaro.org, bgolaszewski@baylibre.com,
	mchehab@kernel.org, andriy.shevchenko@linux.intel.com,
	mark.rutland@arm.com, sakari.ailus@linux.intel.com,
	drinkcat@chromium.org, matthias.bgg@gmail.com,
	bingbu.cao@intel.com, srv_heupstream@mediatek.com,
	linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, sj.huang@mediatek.com,
	linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	louis.kuo@mediatek.com, shengnan.wang@mediatek.com
Subject: Re: [V8, 1/2] media: dt-bindings: media: i2c: Document OV02A10 bindings
Date: Thu, 21 May 2020 19:35:25 +0000	[thread overview]
Message-ID: <20200521193525.GB14214@chromium.org> (raw)
In-Reply-To: <20200511160207.GA32476@bogus>

Hi Rob,

On Mon, May 11, 2020 at 11:02:07AM -0500, Rob Herring wrote:
> On Sat, May 09, 2020 at 04:06:26PM +0800, Dongchun Zhu wrote:
> > Add DT bindings documentation for Omnivision OV02A10 image sensor.
> > 
> > Signed-off-by: Dongchun Zhu <dongchun.zhu@mediatek.com>
> > ---
> >  .../bindings/media/i2c/ovti,ov02a10.yaml           | 184 +++++++++++++++++++++
> >  MAINTAINERS                                        |   7 +
> >  2 files changed, 191 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov02a10.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ovti,ov02a10.yaml b/Documentation/devicetree/bindings/media/i2c/ovti,ov02a10.yaml
> > new file mode 100644
> > index 0000000..5468d1b
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/ovti,ov02a10.yaml
> > @@ -0,0 +1,184 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +# Copyright (c) 2020 MediaTek Inc.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/ovti,ov02a10.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Omnivision OV02A10 CMOS Sensor Device Tree Bindings
> > +
> > +maintainers:
> > +  - Dongchun Zhu <dongchun.zhu@mediatek.com>
> > +
> > +description: |-
> > +  The Omnivision OV02A10 is a low-cost, high performance, 1/5-inch, 2 megapixel
> > +  image sensor, which is the latest production derived from Omnivision's CMOS
> > +  image sensor technology. Ihis chip supports high frame rate speeds up to 30fps
> > +  @ 1600x1200 (UXGA) resolution transferred over a 1-lane MIPI interface. The
> > +  sensor output is available via CSI-2 serial data output.
> > +
> > +properties:
> > +  compatible:
> > +    const: ovti,ov02a10
> > +
> > +  reg:
> > +    description: I2C device address
> 
> Drop this. Nothing specific to this device.
> 
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: top mux camtg clock
> > +      - description: devider clock
> 
> typo
> 
> > +
> > +  clock-names:
> > +    items:
> > +      - const: eclk
> > +      - const: freq_mux
> > +
> > +  clock-frequency:
> > +    description:
> > +      Frequency of the eclk clock in Hertz.
> > +
> > +  dovdd-supply:
> > +    description:
> > +      Definition of the regulator used as interface power supply.
> > +
> > +  avdd-supply:
> > +    description:
> > +      Definition of the regulator used as analog power supply.
> > +
> > +  dvdd-supply:
> > +    description:
> > +      Definition of the regulator used as digital power supply.
> > +
> > +  powerdown-gpios:
> > +    maxItems: 1
> > +
> > +  reset-gpios:
> > +    maxItems: 1

I asked a question about defining GPIO polarities some time ago, but I
guess it slipped through.

The chip documentation calls the reset pin as "RST_PAD (low level
reset)". Where should the inversion be handled, in the driver or here,
by having the DT include a necessary flag in the specifier?

Best regards,
Tomasz