Hi,
On Wednesday, September 17, 2014, Dong Aisheng Wrote,
> >
> > +static struct syscon *of_syscon_register(struct device_node *np) {
> > + struct syscon *syscon;
> > + struct regmap *regmap;
> > + void __iomem *base;
> > +
> > + if (!of_device_is_compatible(np, "syscon"))
> > + return ERR_PTR(-EINVAL);
> > +
> > + syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);
> > + if (!syscon)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + base = of_iomap(np, 0);
> > + if (!base)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + regmap = regmap_init_mmio(NULL, base, &syscon_regmap_config);
>
> Does a NULL device pointer work?
Yes, it is safe, at least we are able to test on Exynos based SoC.
I have tested it with kgene/for-next kernel on Exynos3250.
Also it has been tested on Exynos5250 based Snow board with 3.17-rc5 based
kernel
by Vivek Gautam.
Patch V2 also has been tested by "Borris Brezillon" on AT91 platform.
> I just tested on MX6SX SDB board and it seemed crashed at here in
regmap_init
> function.
>
Can you please provide crash log which can give more information about the
crash?
Thanks,
Pankaj Dubey
> Regards
> Dong Aisheng
>
> > + if (IS_ERR(regmap)) {
> > + pr_err("regmap init failed\n");
> > + return ERR_CAST(regmap);
> > + }
> > +
> > + syscon->regmap = regmap;
> > + syscon->np = np;
> > +
> > + spin_lock(&syscon_list_slock);
> > + list_add_tail(&syscon->list, &syscon_list);
> > + spin_unlock(&syscon_list_slock);
> > +
> > + return syscon;
> > +}
> > +
> > static int syscon_probe(struct platform_device *pdev) {
> > struct device *dev = &pdev->dev;
> > @@ -167,7 +204,6 @@ static struct platform_driver syscon_driver = {
> > .driver = {
> > .name = "syscon",
> > .owner = THIS_MODULE,
> > - .of_match_table = of_syscon_match,
> > },
> > .probe = syscon_probe,
> > .id_table = syscon_ids,
> > --
> > 1.7.9.5
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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