linux-kernel - Re: [PATCH] mtd: nand: mpc5121: use 'of_machine_is

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Message-ID: <20160111135558.6ebd1165@bbrezillon>
Date:	Mon, 11 Jan 2016 13:55:58 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:	dwmw2@...radead.org, computersforpeace@...il.com,
	kernel-janitors@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: nand: mpc5121: use 'of_machine_is_compatible' to
 simplify code

Hi Christophe,

On Sun, 10 Jan 2016 07:46:39 +0100
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:

> The current code is the same as 'of_machine_is_compatible'.
> So use it in order to remove a few lines of code and to be more
> consistent with other parts of the kernel.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Your patch looks good from a functional POV, but what is this board
detection hack doing in the NAND driver code in the first place?

Let's say I didn't see that :-).

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

> ---
>  drivers/mtd/nand/mpc5121_nfc.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
> index 6b93e89..5d7843f 100644
> --- a/drivers/mtd/nand/mpc5121_nfc.c
> +++ b/drivers/mtd/nand/mpc5121_nfc.c
> @@ -626,7 +626,7 @@ static void mpc5121_nfc_free(struct device *dev, struct mtd_info *mtd)
>  
>  static int mpc5121_nfc_probe(struct platform_device *op)
>  {
> -	struct device_node *rootnode, *dn = op->dev.of_node;
> +	struct device_node *dn = op->dev.of_node;
>  	struct clk *clk;
>  	struct device *dev = &op->dev;
>  	struct mpc5121_nfc_prv *prv;
> @@ -712,18 +712,15 @@ static int mpc5121_nfc_probe(struct platform_device *op)
>  	chip->ecc.mode = NAND_ECC_SOFT;
>  
>  	/* Support external chip-select logic on ADS5121 board */
> -	rootnode = of_find_node_by_path("/");
> -	if (of_device_is_compatible(rootnode, "fsl,mpc5121ads")) {
> +	if (of_machine_is_compatible("fsl,mpc5121ads")) {
>  		retval = ads5121_chipselect_init(mtd);
>  		if (retval) {
>  			dev_err(dev, "Chipselect init error!\n");
> -			of_node_put(rootnode);
>  			return retval;
>  		}
>  
>  		chip->select_chip = ads5121_select_chip;
>  	}
> -	of_node_put(rootnode);
>  
>  	/* Enable NFC clock */
>  	clk = devm_clk_get(dev, "ipg");



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com