Re: [RFC PATCH 2/2] HISI LPC: Add PNP device support

[John Garry]

Hi Mika,

> >  /*
> > @@ -469,8 +472,11 @@ static int hisi_lpc_acpi_probe(struct device *hostdev)
> >  	struct acpi_device *child;
> >  	int size, ret, count = 0, cell_num = 0;
> >
> > -	list_for_each_entry(child, &adev->children, node)
> > +	list_for_each_entry(child, &adev->children, node) {
> > +		if (acpi_is_pnp_device(child))
> > +			continue;
> >  		cell_num++;
> > +	}
> >
> >  	/* allocate the mfd cell and companion ACPI info, one per child */
> >  	size = sizeof(*mfd_cells) + sizeof(*hisi_lpc_mfd_cells);
> > @@ -492,6 +498,9 @@ static int hisi_lpc_acpi_probe(struct device *hostdev)
> >  			.pnpid = pnpid,
> >  		};
> >
> > +		if (acpi_is_pnp_device(child))
> > +			continue;
> > +
> >  		/*
> >  		 * For any instances of this host controller (Hip06 and Hip07
> >  		 * are the only chipsets), we would not have multiple slaves
> > @@ -523,6 +532,33 @@ static int hisi_lpc_acpi_probe(struct device *hostdev)
> >  		return ret;
> >  	}
> >
> > +	list_for_each_entry(child, &adev->children, node) {
> > +		struct pnp_resource *pnp_res;
> > +		struct pnp_dev *pnp_dev;
> > +		int rc;
> > +
> > +		if (!acpi_is_pnp_device(child))
> > +			continue;
> > +
> > +		pnp_dev = child->driver_data;
>
> ...or better yet a PNP helper function that makes this more
> understandable.

Sure, but I would not say the helper function would do the same, due to 
to (ab)use of driver_data element. As I mentioned in patch 1/2, I 
couldn't see a current method for the acpi_device to reference the PNP 
device.

> > +
> > +		/*
> > +		 * Prior to adding the device, we need to translate the
> > +		 * resources to logical PIO addresses.
> > +		 */
> > +		list_for_each_entry(pnp_res, &pnp_dev->resources, list) {
> > +			struct resource *res = &pnp_res->res;
> > +
> > +			if (res->flags | IORESOURCE_IO)
>
> I think you should use
>
> 	if (resource_type(res) == IORESOURCE_IO)
>
> instead.

Yes, since I don't know the difference between logical OR and logical AND :)

> > +				hisi_lpc_acpi_xlat_io_res(child, adev, res);
> > +		}
> > +		rc = pnp_add_device(pnp_dev);
> > +		if (rc) {
> > +			put_device(&pnp_dev->dev);
> > +			return rc;
> > +		}
> > +	}
> > +

Cheers,
John

> >  	return 0;
> >  }
> >
> > --
> > 1.9.1
>
> .