linux-kernel - Re: [PATCH v3 2/2] soc: Add driver for Freescale Vybrid Platform

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Message-ID: <20150522115529.GA11118@Sanchayan-Arch.toradex.int>
Date:	Fri, 22 May 2015 17:25:29 +0530
From:	maitysanchayan@...il.com
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, stefan@...er.ch,
	shawn.guo@...aro.org, kernel@...gutronix.de,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] soc: Add driver for Freescale Vybrid Platform

Hello Arnd,

On 15-05-22 13:11:46, Arnd Bergmann wrote:
> On Friday 22 May 2015 16:21:54 Sanchayan Maity wrote:
> > +#define OCOTP_CFG0_OFFSET      0x00000410
> > +#define OCOTP_CFG1_OFFSET      0x00000420
> > +#define MSCM_CPxCOUNT_OFFSET   0x0000002C
> > +#define MSCM_CPxCFG1_OFFSET    0x00000014
> > +#define ROM_REVISION_OFFSET    0x00000080
> > +
> > +static const struct of_device_id vf610_soc_bus_match[] = {
> > +	{ .compatible = "fsl,vf610-mscm-cpucfg", },
> > +	{ /* sentinel */ }
> > +};
> > +
> > +static int __init vf610_soc_init(void)
> > +{
> > +	struct regmap *ocotp_regmap, *mscm_regmap, *rom_regmap;
> > +	struct soc_device_attribute *soc_dev_attr;
> > +	struct soc_device *soc_dev;
> > +	struct device_node *np;
> > +	char soc_type[] = "xx0";
> > +	u32 cpxcount, cpxcfg1;
> > +	u32 soc_id1, soc_id2, rom_rev;
> > +	u64 soc_id;
> > +	int ret;
> > +
> > +	np = of_find_matching_node(NULL, vf610_soc_bus_match);
> > +	if (!np)
> > +		return -ENODEV;
> > +
> 
> Why not use module_platform_driver() and make this a probe function instead?

Had done that but after having a look at the existing integrator and versatile
platform implementation, I changed it. Will switch to using that.

> 
> > +	ocotp_regmap = syscon_regmap_lookup_by_compatible("fsl,vf610-ocotp");
> > +	if (IS_ERR(ocotp_regmap)) {
> > +		pr_err("regmap lookup for octop failed\n");
> > +		return PTR_ERR(ocotp_regmap);
> > +	}
> > +
> > +	mscm_regmap = syscon_regmap_lookup_by_compatible("fsl,vf610-mscm-cpucfg");
> > +	if (IS_ERR(mscm_regmap)) {
> > +		pr_err("regmap lookup for mscm failed");
> > +		return PTR_ERR(mscm_regmap);
> > +	}
> > +
> > +	rom_regmap = syscon_regmap_lookup_by_compatible("fsl,vf610-ocrom");
> > +	if (IS_ERR(rom_regmap)) {
> > +		pr_err("regmap lookup for ocrom failed");
> > +		return PTR_ERR(rom_regmap);
> > +	}
> 
> Can you use syscon_regmap_lookup_by_phandle instead, and put the
> phandles in the fsl,vf610-mscm-cpucfg node?

Ok. Will do so.

- Sanchayan.

> 
> Also, I'd argue that the mscm should not be a syscon device at all,
> but instead I'd use platform_get_resource()/devm_ioremap_resource()
> to get an __iomem pointer.
> 
> 	Arnd
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