How to handle named resources with DT?
From: paul@pwsan.com (Paul Walmsley)
Date: 2011-08-27 19:31:05
Also in:
linux-devicetree, linux-omap
Possibly related (same subject, not in this thread)
- 2011-08-31 · Re: How to handle named resources with DT? · David Gibson <hidden>
- 2011-08-30 · Re: How to handle named resources with DT? · Felipe Balbi <hidden>
- 2011-08-30 · Re: How to handle named resources with DT? · David Gibson <hidden>
- 2011-08-29 · Re: How to handle named resources with DT? · Mark Brown <hidden>
- 2011-08-28 · Re: How to handle named resources with DT? · Russell King - ARM Linux <hidden>
On Sat, 27 Aug 2011, Arnd Bergmann wrote:
Right, and I guess we can simply ignore DMA and ioport resources because they are extremely rare, right?
DMA resources are quite widely used. For example, looking at the SoCs with some publicly-available documentation, the Motorola i.MX51 reference manual lists 47 SDMA request lines across about 17 different IP block types[1], and to pick a representative OMAP, the OMAP3430 technical reference manual lists 77 SDMA request lines, used by at least 9 different IP block types[2]. Also, many IP blocks have multiple DMA resources. For example, the above references list UART, MCSPI, PATA, I2C, FIRI, MCBSP, SSI, CTI, CSPI, eCSPI, EMI, eSDHC, SPI, and DSS. - Paul 1. Table 3-3, "SDMA Event Mapping". _MCIMX51 Multimedia Applications Processor Reference Manual (MCIMX51RM) Rev. 1 2/2010_. Available from http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=i.MX515&fpsp=1&tab=Documentation_Tab 2. This is simply one example from the OMAP3430 TRM, but similar tables are available for OMAP2420, 2430, 3430, 3630, 4430, 4460, 4470, etc. Table 9-3, "SDMA Request Mapping". _OMAP34xx Multimedia Device Silicon Revision 3.1.x Version J (SWPU223J)_ (public version). Available from http://focus.ti.com/general/docs/wtbu/wtbudocumentcenter.tsp?templateId=6123&navigationId=12667