linux-kernel - Re: [PATCH 2/6] dt-bindings: gpio: Add Delta TN48M CPLD GPIO bindings

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Date:   Thu, 6 May 2021 08:57:04 -0500
From:   Rob Herring <robh@...nel.org>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     lee.jones@...aro.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, jdelvare@...e.com, linux@...ck-us.net,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-hwmon@...r.kernel.org,
        luka.perkov@...tura.hr, jmp@...phyte.org, pmenzel@...gen.mpg.de,
        buczek@...gen.mpg.de
Subject: Re: [PATCH 2/6] dt-bindings: gpio: Add Delta TN48M CPLD GPIO bindings

On Fri, Apr 30, 2021 at 02:35:07PM +0200, Robert Marko wrote:
> CPLD inside of the Delta TN48M does not number GPIOs
> at all, so in order to ensure numbering lets use bindigs.

Looking at the code, I'd make the gpio number something like '(offset << 
8) | bit' rather than just making up an index.

We don't normally have defines for GPIO numbers either.

> 
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
>  include/dt-bindings/gpio/tn48m-gpio.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>  create mode 100644 include/dt-bindings/gpio/tn48m-gpio.h
> 
> diff --git a/include/dt-bindings/gpio/tn48m-gpio.h b/include/dt-bindings/gpio/tn48m-gpio.h
> new file mode 100644
> index 000000000000..4ece4826d746
> --- /dev/null
> +++ b/include/dt-bindings/gpio/tn48m-gpio.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * GPIO definitions for Delta TN48M CPLD GPIO driver
> + *
> + * Copyright 2020 Sartura Ltd
> + *
> + * Author: Robert Marko <robert.marko@...tura.hr>
> + */
> +
> +#ifndef _DT_BINDINGS_TN48M_GPIO_H
> +#define _DT_BINDINGS_TN48M_GPIO_H
> +
> +#define SFP_TX_DISABLE_52	0
> +#define SFP_TX_DISABLE_51	1
> +#define SFP_TX_DISABLE_50	2
> +#define SFP_TX_DISABLE_49	3
> +#define SFP_PRESENT_52		4
> +#define SFP_PRESENT_51		5
> +#define SFP_PRESENT_50		6
> +#define SFP_PRESENT_49		7
> +#define SFP_LOS_52		8
> +#define SFP_LOS_51		9
> +#define SFP_LOS_50		10
> +#define SFP_LOS_49		11
> +
> +#endif /* _DT_BINDINGS_TN48M_GPIO_H */
> -- 
> 2.31.1
>