From: Arnd Bergmann <arnd@arndb.de>
To: Moritz Fischer <moritz.fischer@ettus.com>
Cc: linus.walleij@linaro.org, linux-kernel@vger.kernel.org,
        linux-gpio@vger.kernel.org, robh+dt@kernel.org, pawel.moll@arm.com,
        mark.rutland@arm.com, ijc+devicetree@hellion.org.uk,
        galak@codeaurora.org, devicetree@vger.kernel.org
Subject: Re: [RFC 3/3] ARM: e3xx: Add header file for pinctrl constants
Date: Fri, 06 Nov 2015 09:54:46 +0100
Message-ID: <3715539.QztuvljIIp@wuerfel>
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On Thursday 05 November 2015 15:41:23 Moritz Fischer wrote:
> +/* Pin names for the E31x usecase */
> +#define E31X_TX_BANDSEL_2      "DB_1"
> +#define E31X_RX1B_BANDSEL_0    "DB_3"
> +#define E31X_RX1B_BANDSEL_1    "DB_5"
> +#define E31X_VCTXRX2_V2                "DB_7"
> +#define E31X_TX_ENABLE1A       "DB_9"
> +#define E31X_TX_ENABLE2A       "DB_11"
> +#define E31X_TX_BANDSEL_0      "DB_12"

Why not put the strings directly into the .dts files and change the
lookup table in the driver accordingly:

+static const struct pinctrl_pin_desc e3xx_pins[] = {
+       /* pin0 doesn't exist */
+       PINCTRL_PIN(1, "TX_BANDSEL_2"),
+       PINCTRL_PIN(3, "RX1B_BANDSEL_0"),
+       PINCTRL_PIN(5, "RX1B_BANDSEL_1"),
+       PINCTRL_PIN(7, "VCTXRX2_V2"),

That would save you the hassle of the three-way dependency between the
dts file, the driver and the header when you want to change something
going through three different maintainer trees.

	arnd
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