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ARM OMAP2+ GPMC: calculate GPMCFCLKDIVIDER based on WAITMONITORINGTIME

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The WAITMONITORINGTIME is expressed as a number of GPMC_CLK clock cycles,
even though the access is defined as asynchronous, and no GPMC_CLK clock
is provided to the external device. Still, GPMCFCLKDIVIDER is used as a divider
for the GPMC clock, so it must be programmed to define the
correct WAITMONITORINGTIME delay.

Calculate GPMCFCLKDIVIDER independent of gpmc,sync-clk-ps in DT for
pure asynchronous accesses, i.e. both read and write asynchronous.

Signed-off-by: Robert ABEL <rabel@cit-ec.uni-bielefeld.de>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
This commit is contained in:
Robert ABEL
2015-02-27 16:56:53 +01:00
committed by Roger Quadros
parent f585070b91
commit 2e67690137
5 changed files with 95 additions and 20 deletions
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4
arch/arm/mach-omap2/usb-tusb6010.c
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@@ -71,7 +71,7 @@ static int tusb_set_async_mode(unsigned sysclk_ps)
gpmc_calc_timings(&t, &tusb_async, &dev_t);
return gpmc_cs_set_timings(async_cs, &t);
return gpmc_cs_set_timings(async_cs, &t, &tusb_async);
}
static int tusb_set_sync_mode(unsigned sysclk_ps)
@@ -98,7 +98,7 @@ static int tusb_set_sync_mode(unsigned sysclk_ps)
gpmc_calc_timings(&t, &tusb_sync, &dev_t);
return gpmc_cs_set_timings(sync_cs, &t);
return gpmc_cs_set_timings(sync_cs, &t, &tusb_sync);
}
/* tusb driver calls this when it changes the chip's clocking */