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Date:   Mon, 10 Jul 2023 10:44:18 +0300
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Subject: Re: [EXT] Re: [PATCH v6 4/8] phy: Add HDMI configuration options
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To:     Sandor Yu <sandor.yu@nxp.com>,
        "andrzej.hajda@intel.com" <andrzej.hajda@intel.com>,
        "neil.armstrong@linaro.org" <neil.armstrong@linaro.org>,
        "robert.foss@linaro.org" <robert.foss@linaro.org>,
        "Laurent.pinchart@ideasonboard.com" 
        <Laurent.pinchart@ideasonboard.com>,
        "jonas@kwiboo.se" <jonas@kwiboo.se>,
        "jernej.skrabec@gmail.com" <jernej.skrabec@gmail.com>,
        "airlied@gmail.com" <airlied@gmail.com>,
        "daniel@ffwll.ch" <daniel@ffwll.ch>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "krzysztof.kozlowski+dt@linaro.org" 
        <krzysztof.kozlowski+dt@linaro.org>,
        "shawnguo@kernel.org" <shawnguo@kernel.org>,
        "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
        "festevam@gmail.com" <festevam@gmail.com>,
        "vkoul@kernel.org" <vkoul@kernel.org>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-phy@lists.infradead.org" <linux-phy@lists.infradead.org>
Cc:     "kernel@pengutronix.de" <kernel@pengutronix.de>,
        dl-linux-imx <linux-imx@nxp.com>,
        Oliver Brown <oliver.brown@nxp.com>
References: <cover.1686729444.git.Sandor.yu@nxp.com>
 <cec469206a166c4b070fd7d7bbf89a8df656ccc6.1686729444.git.Sandor.yu@nxp.com>
 <6f590bb6-7d17-3ae8-684d-2d4403d6ff55@linaro.org>
 <PAXPR04MB9448598256524162A74F0311F430A@PAXPR04MB9448.eurprd04.prod.outlook.com>
From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
In-Reply-To: <PAXPR04MB9448598256524162A74F0311F430A@PAXPR04MB9448.eurprd04.prod.outlook.com>
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On 10/07/2023 10:28, Sandor Yu wrote:
> Hi Dmitry,
> 
> Thanks for your comments,
> 
>> From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> On 15/06/2023 04:38, Sandor Yu wrote:
>>> Allow HDMI PHYs to be configured through the generic functions through
>>> a custom structure added to the generic union.
>>>
>>> The parameters added here are based on HDMI PHY implementation
>>> practices.  The current set of parameters should cover the potential
>>> users.
>>>
>>> Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
>>> ---
>>>    include/linux/phy/phy-hdmi.h | 38
>> ++++++++++++++++++++++++++++++++++++
>>>    include/linux/phy/phy.h      |  7 ++++++-
>>>    2 files changed, 44 insertions(+), 1 deletion(-)
>>>    create mode 100644 include/linux/phy/phy-hdmi.h
>>>
>>> diff --git a/include/linux/phy/phy-hdmi.h
>>> b/include/linux/phy/phy-hdmi.h new file mode 100644 index
>>> 000000000000..5765aa5bc175
>>> --- /dev/null
>>> +++ b/include/linux/phy/phy-hdmi.h
>>> @@ -0,0 +1,38 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +/*
>>> + * Copyright 2022 NXP
>>> + */
>>> +
>>> +#ifndef __PHY_HDMI_H_
>>> +#define __PHY_HDMI_H_
>>> +
>>> +/**
>>> + * Pixel Encoding as HDMI Specification
>>> + * RGB, YUV422, YUV444:HDMI Specification 1.4a Section 6.5
>>> + * YUV420: HDMI Specification 2.a Section 7.1  */ enum
>>> +hdmi_phy_colorspace {
>>> +     HDMI_PHY_COLORSPACE_RGB,        /* RGB 4:4:4 */
>>> +     HDMI_PHY_COLORSPACE_YUV422,     /* YCbCr 4:2:2 */
>>> +     HDMI_PHY_COLORSPACE_YUV444,     /* YCbCr 4:4:4 */
>>> +     HDMI_PHY_COLORSPACE_YUV420,     /* YCbCr 4:2:0 */
>>> +     HDMI_PHY_COLORSPACE_RESERVED4,
>>> +     HDMI_PHY_COLORSPACE_RESERVED5,
>>> +     HDMI_PHY_COLORSPACE_RESERVED6,
>>> +};
>>
>> This enum duplicates enum hdmi_colorspace from <linux/hdmi.h> HDMI 2.0
>> defines '7' to be IDO-defined.
>>
>> Would it be better to use that enum instead?
> Accept. I will create head file hdmi_colorspace.h to reuse enum hdmi_colorspace in <linux/hdmi.h>.

Excuse me, it was supposed to be a question.

Do you need another header file to reuse this enum?

> 
> B.R
> Sandor
>>
>>> +
>>> +/**
>>> + * struct phy_configure_opts_hdmi - HDMI configuration set
>>> + * @pixel_clk_rate:  Pixel clock of video modes in KHz.
>>> + * @bpc: Maximum bits per color channel.
>>> + * @color_space: Colorspace in enum hdmi_phy_colorspace.
>>> + *
>>> + * This structure is used to represent the configuration state of a HDMI phy.
>>> + */
>>> +struct phy_configure_opts_hdmi {
>>> +     unsigned int pixel_clk_rate;
>>> +     unsigned int bpc;
>>> +     enum hdmi_phy_colorspace color_space; };
>>> +
>>> +#endif /* __PHY_HDMI_H_ */
>>
>> [skipped the rest]
>>
>> --
>> With best wishes
>> Dmitry
> 

-- 
With best wishes
Dmitry