linux-kernel - Re: [PATCH 1/2] [v4] net: emac: emac gigabit ethernet controller driver

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Date:	Fri, 15 Apr 2016 09:44:33 -0700
From:	Bjorn Andersson <bjorn.andersson@...aro.org>
To:	Timur Tabi <timur@...eaurora.org>
Cc:	Vikram Sethi <vikrams@...eaurora.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	sdharia@...eaurora.org,
	Shanker Donthineni <shankerd@...eaurora.org>,
	Greg Kroah-Hartman <greg@...ah.com>, cov@...eaurora.org,
	gavidov@...eaurora.org, Rob Herring <robh+dt@...nel.org>,
	andrew@...n.ch, Mark Langsdorf <mlangsdo@...hat.com>,
	Jon Masters <jcm@...hat.com>,
	Andy Gross <agross@...eaurora.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/2] [v4] net: emac: emac gigabit ethernet controller
 driver

On Thu 14 Apr 16:34 PDT 2016, Timur Tabi wrote:

[..]
> So I think the solution is to create a device tree (and ACPI) property that
> holds the mask.
> 
> 	dma-mask = <0 0xffffffff>;
> 
> or
> 
> 	dma-mask = <0xffffffff 0xffffffff>;
> 
> The driver will then do this:
> 
> 	u64 dma_mask;
> 	device_property_read_u64(&pdev->dev, "dma-mask", &dma_mask);
> 	dma_coerce_mask_and_coherent(&pdev->dev, dma_mask);
> 
> What I'm not sure yet is whether I should call
> dma_coerce_mask_and_coherent() or dma_set_coherent_mask().
> 

For platform devices being populated via from DT you will pass:
of_platform_bus_create()
  of_platform_device_create_pdata()
    of_dma_configure()

Which calls of_dma_get_range() to acquire this information from the
dma-ranges property and set up the dma ops and properties.

Regards,
Bjorn