linux-kernel - Re: [PATCH v5 09/26] mtd: nand: omap: Clean up device tree support

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Message-ID: <20160305021035.GM55664@google.com>
Date:	Fri, 4 Mar 2016 18:10:35 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	tony@...mide.com, dwmw2@...radead.org,
	ezequiel@...guardiasur.com.ar, javier@...hile0.org, fcooper@...com,
	nsekhar@...com, linux-mtd@...ts.infradead.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 09/26] mtd: nand: omap: Clean up device tree support

A couple of sparse warnings.

On Fri, Feb 19, 2016 at 11:15:31PM +0200, Roger Quadros wrote:
> Move NAND specific device tree parsing to NAND driver.
> 
> The NAND controller node must have a compatible id, register space
> resource and interrupt resource.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  arch/arm/mach-omap2/gpmc-nand.c              |   5 +-
>  drivers/memory/omap-gpmc.c                   | 143 +++++++--------------------
>  drivers/mtd/nand/omap2.c                     | 133 +++++++++++++++++++++----
>  include/linux/platform_data/mtd-nand-omap2.h |   3 +-
>  4 files changed, 152 insertions(+), 132 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
> index 04e6998..f6ac027 100644
> --- a/arch/arm/mach-omap2/gpmc-nand.c
> +++ b/arch/arm/mach-omap2/gpmc-nand.c

[...]

> @@ -2039,9 +1939,42 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>  		goto err;
>  	}
>  
> -	ret = of_property_read_u32(child, "bank-width", &gpmc_s.device_width);
> -	if (ret < 0)
> -		goto err;
> +	if (of_node_cmp(child->name, "nand") == 0) {
> +		/* NAND specific setup */
> +		u32 val;

drivers/memory/omap-gpmc.c:1952:13: originally declared here [sparse]
drivers/memory/omap-gpmc.c:2029:21: warning: symbol 'val' shadows an earlier one [sparse]

> +
> +		/* Warn about older DT blobs with no compatible property */
> +		if (!of_property_read_bool(child, "compatible")) {
> +			dev_warn(&pdev->dev,
> +				 "Incompatible NAND node: missing compatible");
> +			ret = -EINVAL;
> +			goto err;
> +		}
> +

[...]

> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 9e99199..0a637c4 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c

[...]

> +static int omap_get_dt_info(struct device *dev, struct omap_nand_info *info)
> +{
> +	struct device_node *child = dev->of_node;
> +	int i;
> +	const char *s;
> +
> +	/* In old bindings, CS num is embedded in reg property */
> +	if (of_property_read_u32(child, "reg", &info->gpmc_cs) < 0) {

Sparse doesn't like this one:

drivers/mtd/nand/omap2.c:1660:49: warning: incorrect type in argument 3 (different signedness) [sparse]
drivers/mtd/nand/omap2.c:1660:49:    expected unsigned int [usertype] *out_value [sparse]
drivers/mtd/nand/omap2.c:1660:49:    got int *<noident> [sparse]

> +		dev_err(dev, "reg not found in DT\n");
> +		return -EINVAL;
> +	}
> +

[...]

Brian