From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Christoph Hellwig <hch@infradead.org>, Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org,
Florian Fainelli <f.fainelli@gmail.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Arnd Bergmann <arnd@arndb.de>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Marek Vasut <marek.vasut@gmail.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Oza Pawandeep <oza.oza@broadcom.com>,
Stefan Wahren <wahrenst@gmx.net>,
Simon Horman <horms+renesas@verge.net.au>,
Frank Rowand <frowand.list@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 05/11] of: Ratify of_dma_configure() interface
Date: Mon, 30 Sep 2019 15:32:55 +0200 [thread overview]
Message-ID: <95f8dabea99f104336491281b88c04b58d462258.camel@suse.de> (raw)
In-Reply-To: <20190930125752.GD12051@infradead.org>
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On Mon, 2019-09-30 at 05:57 -0700, Christoph Hellwig wrote:
> On Thu, Sep 26, 2019 at 07:24:49PM -0500, Rob Herring wrote:
> > -int of_dma_configure(struct device *dev, struct device_node *np, bool
> > force_dma)
> > +int of_dma_configure(struct device *dev, struct device_node *parent, bool
> > force_dma)
>
> This creates a > 80 char line.
>
> > {
> > u64 dma_addr, paddr, size = 0;
> > int ret;
> > bool coherent;
> > unsigned long offset;
> > const struct iommu_ops *iommu;
> > + struct device_node *np;
> > u64 mask;
> >
> > + np = dev->of_node;
> > + if (!np)
> > + np = parent;
> > + if (!np)
> > + return -ENODEV;
>
> I have to say I find the older calling convention simpler to understand.
> If we want to enforce the invariant I'd rather do that explicitly:
>
> if (dev->of_node && np != dev->of_node)
> return -EINVAL;
As is, this would break Freescale Layerscape fsl-mc bus' dma_configure():
static int fsl_mc_dma_configure(struct device *dev)
{
struct device *dma_dev = dev;
while (dev_is_fsl_mc(dma_dev))
dma_dev = dma_dev->parent;
return of_dma_configure(dev, dma_dev->of_node, 0);
}
But I think that with this series, given the fact that we now treat the lack of
dma-ranges as a 1:1 mapping instead of an error, we could rewrite the function
like this:
static int fsl_mc_dma_configure(struct device *dev)
{
return of_dma_configure(dev, false, 0);
}
If needed I can test this.
Regards,
Nicolas
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next prev parent reply other threads:[~2019-09-30 13:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 0:24 [PATCH 00/11] of: dma-ranges fixes and improvements Rob Herring
2019-09-27 0:24 ` [PATCH 01/11] of: Remove unused of_find_matching_node_by_address() Rob Herring
2019-09-27 9:17 ` Geert Uytterhoeven
2019-09-30 12:49 ` Christoph Hellwig
2019-09-27 0:24 ` [PATCH 02/11] of: Make of_dma_get_range() private Rob Herring
2019-09-27 9:18 ` Geert Uytterhoeven
2019-09-30 12:53 ` Christoph Hellwig
2019-09-27 0:24 ` [PATCH 03/11] of: address: Report of_dma_get_range() errors meaningfully Rob Herring
2019-09-27 9:15 ` Geert Uytterhoeven
2019-09-30 12:54 ` Christoph Hellwig
2019-09-27 0:24 ` [PATCH 04/11] of/unittest: Add dma-ranges address translation tests Rob Herring
2019-09-27 0:24 ` [PATCH 05/11] of: Ratify of_dma_configure() interface Rob Herring
2019-09-30 12:57 ` Christoph Hellwig
2019-09-30 13:32 ` Nicolas Saenz Julienne [this message]
2019-09-30 21:24 ` Rob Herring
2019-10-01 15:43 ` Nicolas Saenz Julienne
2019-10-04 1:53 ` Rob Herring
2019-10-07 17:51 ` Nicolas Saenz Julienne
2019-09-27 0:24 ` [PATCH 06/11] of/address: Introduce of_get_next_dma_parent() helper Rob Herring
2019-09-27 9:24 ` Geert Uytterhoeven
2019-09-27 0:24 ` [PATCH 07/11] of: address: Follow DMA parent for "dma-coherent" Rob Herring
2019-09-27 0:24 ` [PATCH 08/11] of: Factor out #{addr,size}-cells parsing Rob Herring
2019-09-27 9:27 ` Geert Uytterhoeven
2019-09-27 0:24 ` [PATCH 09/11] of: Make of_dma_get_range() work on bus nodes Rob Herring
2019-09-27 0:24 ` [PATCH 10/11] of/address: Translate 'dma-ranges' for parent nodes missing 'dma-ranges' Rob Herring
2019-09-27 0:24 ` [PATCH 11/11] of/address: Fix of_pci_range_parser_one translation of DMA addresses Rob Herring
2019-09-29 11:16 ` [PATCH 00/11] of: dma-ranges fixes and improvements Arnd Bergmann
2019-09-30 8:20 ` Christoph Hellwig
2019-09-30 8:56 ` Thierry Reding
2019-09-30 9:55 ` Robin Murphy
2019-09-30 13:35 ` Thierry Reding
2019-09-30 9:20 ` Nicolas Saenz Julienne
2019-09-30 12:40 ` Marek Vasut
2019-09-30 12:52 ` Robin Murphy
2019-09-30 12:54 ` Marek Vasut
2019-09-30 13:05 ` Robin Murphy
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