netdev - Re: [PATCH net-next v3 09/11] dt-bindings: add constants for Microsemi Ocelot SerDes driver

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Date:   Fri, 14 Sep 2018 19:31:31 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Quentin Schulz <quentin.schulz@...tlin.com>,
        alexandre.belloni@...tlin.com, ralf@...ux-mips.org,
        paul.burton@...s.com, jhogan@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, davem@...emloft.net, kishon@...com,
        andrew@...n.ch
Cc:     allan.nielsen@...rochip.com, linux-mips@...ux-mips.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, thomas.petazzoni@...tlin.com
Subject: Re: [PATCH net-next v3 09/11] dt-bindings: add constants for
 Microsemi Ocelot SerDes driver



On 09/14/18 01:16, Quentin Schulz wrote:
> The Microsemi Ocelot has multiple SerDes and requires that the SerDes be
> muxed accordingly to the hardware representation.
> 
> Let's add a constant for each SerDes available in the Microsemi Ocelot.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...tlin.com>
> ---
>  include/dt-bindings/phy/phy-ocelot-serdes.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 include/dt-bindings/phy/phy-ocelot-serdes.h
> 
> diff --git a/include/dt-bindings/phy/phy-ocelot-serdes.h b/include/dt-bindings/phy/phy-ocelot-serdes.h
> new file mode 100644
> index 0000000..cf111ba
> --- /dev/null
> +++ b/include/dt-bindings/phy/phy-ocelot-serdes.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> +/* Copyright (c) 2018 Microsemi Corporation */
> +#ifndef __PHY_OCELOT_SERDES_H__
> +#define __PHY_OCELOT_SERDES_H__
> +
> +#define SERDES1G_0	0
> +#define SERDES1G_1	1
> +#define SERDES1G_2	2
> +#define SERDES1G_3	3
> +#define SERDES1G_4	4
> +#define SERDES1G_5	5
> +#define SERDES1G_MAX	6

Given you use the C preprocessor you could have done something like:

#define SERDES1G(x)	(x)
#define SERDES1G_MAX	5
#define SERDES6G(x)	((x) + SERDES1G_MAX)

etc. but this works for me as well.

> +#define SERDES6G_0	SERDES1G_MAX
> +#define SERDES6G_1	(SERDES1G_MAX + 1)
> +#define SERDES6G_2	(SERDES1G_MAX + 2)
> +#define SERDES6G_MAX	(SERDES1G_MAX + 3)
> +#define SERDES_MAX	(SERDES1G_MAX + SERDES6G_MAX)
> +
> +#endif
> 

-- 
Florian