On Mon, Apr 19, 2010 at 10:54:27AM +0200, Uwe Kleine-König wrote: > Hello, > > On Mon, Apr 19, 2010 at 10:28:13AM +0200, Wolfram Sang wrote: > > From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> > > > > Newer i.MX-variants can route the content of the Sample Status Register to the > > Data Register, but older ones can't. So, use the Sample Register to be generic. > > As a drawback, the ability to read back the values of output GPIOs is lost. > AFAIK the last sentence (that was authored by Wolfram, though the patch > is mine) is wrong. I checked mx27 and mx35 specs and both the overview > and the actual description suggest that reading output values works > (using PSR aka SSR) when the iomuxer is configured for GPIO. Might be that I misinterpreted something. Sascha, can you second Uwe? -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ |
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