linux-kernel - Re: [PATCH v3 6/7] OF: spi: Add overlay bus handler

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Date:	Thu, 20 Mar 2014 11:51:10 +0100
From:	Michael Stickel <ms@...able.de>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Guenter Roeck <linux@...ck-us.net>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pete Popov <pete.popov@...sulko.com>,
	Dan Malek <dan.malek@...sulko.com>,
	Georgi Vlaev <georgi.vlaev@...sulko.com>
Subject: Re: [PATCH v3 6/7] OF: spi: Add overlay bus handler

Am 18.03.2014 22:56, schrieb Pantelis Antoniou:
> Add the bus handler registration needed for performing overlays
> containing spi devices.
> 
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> ---
>  drivers/spi/spi.c | 345 ++++++++++++++++++++++++++++++++++++++----------------
>  1 file changed, 242 insertions(+), 103 deletions(-)
> 

nc is not set in of_register_spi_device and causes an Oops.
Using nc = node works.
What is the purpose of nc?

> +of_register_spi_device(struct spi_master *master, struct device_node *node)
> +{
> +	struct spi_device *spi;
> +	struct device_node *nc;
> +	int err;
> +	u32 value;
> +
> +	/* Alloc an spi_device */
> +	spi = spi_alloc_device(master);
> +	if (!spi) {
> +		dev_err(&master->dev, "spi_device alloc error for %s\n",
> +			nc->full_name);
> +		err = -ENOMEM;
> +		goto err_out;
> +	}
> +
> +	/* Select device driver */
> +	err = of_modalias_node(nc, spi->modalias,
> +				sizeof(spi->modalias));
> +	if (err) {
> +		dev_err(&master->dev, "cannot find modalias for %s\n",
> +			nc->full_name);
> +		goto err_out;
> +	}



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