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Date:   Tue, 7 Aug 2018 18:59:58 +0200
From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Janusz Krzysztofik <jmkrzyszt@gmail.com>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Tony Lindgren <tony@atomide.com>,
        Aaro Koskinen <aaro.koskinen@iki.fi>,
        linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
        linux-mtd@lists.infradead.org, linux-doc@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 03/12] ARM: OMAP1: ams-delta: Provide GPIO lookup
 table for NAND data port
Message-ID: <20180807185958.2fc6e22b@bbrezillon>
In-Reply-To: <20180806222918.12644-4-jmkrzyszt@gmail.com>
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        <20180806222918.12644-1-jmkrzyszt@gmail.com>
        <20180806222918.12644-4-jmkrzyszt@gmail.com>
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On Tue,  7 Aug 2018 00:29:09 +0200
Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:

> Data port used by Amstrad Delta NAND driver is actually an OMAP MPUIO
> device, already under control of gpio-omap driver.  The NAND driver
> gets access to the port by ioremapping it and performs read/write
> operations.  That is done without any proteciton from other users
> legally manipulating the port pins over GPIO API.
> 
> The plan is to convert the driver to access the port over GPIO consumer
> API.  Before that is implemented, the driver can already obtain
> exclusive access to the port by requesting an array of its GPIO
> descriptors.
> 
> Add respective entries to the NAND GPIO lookup table.
> 
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>

Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>

> ---
>  arch/arm/mach-omap1/board-ams-delta.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
> index eedacdfe9725..16f7bbe47607 100644
> --- a/arch/arm/mach-omap1/board-ams-delta.c
> +++ b/arch/arm/mach-omap1/board-ams-delta.c
> @@ -337,7 +337,8 @@ static struct platform_device ams_delta_nand_device = {
>  	.resource	= ams_delta_nand_resources,
>  };
>  
> -#define OMAP_GPIO_LABEL	"gpio-0-15"
> +#define OMAP_GPIO_LABEL		"gpio-0-15"
> +#define OMAP_MPUIO_LABEL	"mpuio"
>  
>  static struct gpiod_lookup_table ams_delta_nand_gpio_table = {
>  	.table = {
> @@ -349,6 +350,14 @@ static struct gpiod_lookup_table ams_delta_nand_gpio_table = {
>  		GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_NWE, "nwe", 0),
>  		GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_ALE, "ale", 0),
>  		GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_NAND_CLE, "cle", 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 0, "data", 0, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 1, "data", 1, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 2, "data", 2, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 3, "data", 3, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 4, "data", 4, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 5, "data", 5, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 6, "data", 6, 0),
> +		GPIO_LOOKUP_IDX(OMAP_MPUIO_LABEL, 7, "data", 7, 0),
>  		{ },
>  	},
>  };