linux-kernel - Re: [PATCH v15 2/8] phy: Add HDMI configuration options

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Date: Fri, 5 Apr 2024 19:54:46 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: Alexander Stein <alexander.stein@...tq-group.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Sandor Yu <Sandor.yu@....com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux@...tq-group.com,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v15 2/8] phy: Add HDMI configuration options

On 06-03-24, 15:48, Maxime Ripard wrote:
> Hi Alexander,
> 
> On Wed, Mar 06, 2024 at 11:16:19AM +0100, Alexander Stein wrote:
> > From: Sandor Yu <Sandor.yu@....com>
> > 
> > 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@....com>
> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > Acked-by: Vinod Koul <vkoul@...nel.org>
> > ---
> >  include/linux/phy/phy-hdmi.h | 24 ++++++++++++++++++++++++
> >  include/linux/phy/phy.h      |  7 ++++++-
> >  2 files changed, 30 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 0000000000000..b7de88e9090f0
> > --- /dev/null
> > +++ b/include/linux/phy/phy-hdmi.h
> > @@ -0,0 +1,24 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright 2022 NXP
> > + */
> > +
> > +#ifndef __PHY_HDMI_H_
> > +#define __PHY_HDMI_H_
> > +
> > +#include <linux/hdmi.h>
> > +/**
> > + * 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_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_colorspace color_space;
> > +};
> 
> Does the PHY actually care about the pixel clock rate, color space and
> formats, or does it only care about the character rate?

Nope it should not

-- 
~Vinod