linux-kernel - Re: [PATCH V2 2/3] clk: vc5: Enable addition output configurations of the Versaclock

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Date:   Tue, 12 May 2020 17:05:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-clk@...r.kernel.org, aford@...conembedded.com,
        charles.stevens@...icpd.com,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/3] clk: vc5: Enable addition output configurations
 of the Versaclock

On Sat, May 02, 2020 at 07:21:25AM -0500, Adam Ford wrote:
> The existing driver is expecting the Versaclock to be pre-programmed,
> and only sets the output frequency.  Unfortunately, not all devices
> are pre-programmed, and the Versaclock chip has more options beyond
> just the frequency.
> 
> This patch enables the following additional features:
> 
>    - Programmable voltage: 1.8V, 2.5V, or 3.3V
>    - Slew Percentage of normal: 85%, 90%, or 100%
>    - Output Type: LVPECL, CMOS, HCSL, or LVDS
> 
> Signed-off-by: Adam Ford <aford173@...il.com>


> diff --git a/include/dt-bindings/clk/versaclock.h b/include/dt-bindings/clk/versaclock.h
> new file mode 100644
> index 000000000000..c6a6a0946564
> --- /dev/null
> +++ b/include/dt-bindings/clk/versaclock.h

Belongs in binding patch.

> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/* This file defines field values used by the versaclock 6 family
> + * for defining output type
> + */
> +
> +#define VC5_LVPECL	0
> +#define VC5_CMOS	1
> +#define VC5_HCSL33	2
> +#define VC5_LVDS	3
> +#define VC5_CMOS2	4
> +#define VC5_CMOSD	5
> +#define VC5_HCSL25	6
> -- 
> 2.25.1
>