linux-kernel - Re: [PATCH v6 resend 2/5] phy: Add LVDS configuration options

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Message-ID: <YlZpnrKt9NbHZv26@matsya>
Date:   Wed, 13 Apr 2022 11:41:42 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Liu Ying <victor.liu@....com>
Cc:     linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, kishon@...com,
        robh+dt@...nel.org, andrzej.hajda@...el.com,
        narmstrong@...libre.com, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, airlied@...ux.ie,
        daniel@...ll.ch, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        agx@...xcpu.org, robert.chiras@....com, martin.kepplinger@...i.sm,
        robert.foss@...aro.org
Subject: Re: [PATCH v6 resend 2/5] phy: Add LVDS configuration options

On 02-04-22, 13:24, Liu Ying wrote:
> This patch allows LVDS PHYs to be configured through
> the generic functions and through a custom structure
> added to the generic union.
> 
> The parameters added here are based on common LVDS PHY
> implementation practices.  The set of parameters
> should cover all potential users.
> 
> Cc: Kishon Vijay Abraham I <kishon@...com>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: NXP Linux Team <linux-imx@....com>
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
> v5->v6:
> * Rebase upon v5.17-rc1.
> 
> v4->v5:
> * Align kernel-doc style to include/linux/phy/phy.h. (Vinod)
> * Trivial tweaks.
> * Drop Robert's R-b tag.
> 
> v3->v4:
> * Add Robert's R-b tag.
> 
> v2->v3:
> * No change.
> 
> v1->v2:
> * No change.
> 
>  include/linux/phy/phy-lvds.h | 32 ++++++++++++++++++++++++++++++++
>  include/linux/phy/phy.h      |  4 ++++
>  2 files changed, 36 insertions(+)
>  create mode 100644 include/linux/phy/phy-lvds.h
> 
> diff --git a/include/linux/phy/phy-lvds.h b/include/linux/phy/phy-lvds.h
> new file mode 100644
> index 000000000000..7a2f4747f624
> --- /dev/null
> +++ b/include/linux/phy/phy-lvds.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2020 NXP

2022 now

> + */
> +
> +#ifndef __PHY_LVDS_H_
> +#define __PHY_LVDS_H_
> +
> +/**
> + * struct phy_configure_opts_lvds - LVDS configuration set
> + * @bits_per_lane_and_dclk_cycle:	Number of bits per data lane and
> + *					differential clock cycle.

What does it mean by bits per data lane and differential clock cycle?

> + * @differential_clk_rate:		Clock rate, in Hertz, of the LVDS
> + *					differential clock.
> + * @lanes:				Number of active, consecutive,
> + *					data lanes, starting from lane 0,
> + *					used for the transmissions.
> + * @is_slave:				Boolean, true if the phy is a slave
> + *					which works together with a master
> + *					phy to support dual link transmission,
> + *					otherwise a regular phy or a master phy.
> + *
> + * This structure is used to represent the configuration state of a LVDS phy.
> + */
> +struct phy_configure_opts_lvds {
> +	unsigned int	bits_per_lane_and_dclk_cycle;
> +	unsigned long	differential_clk_rate;
> +	unsigned int	lanes;
> +	bool		is_slave;
> +};

Where is the user of this new configuration? Can you post that patch for
reference as well please

-- 
~Vinod