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* [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
@ 2007-08-02 14:26 Anton Vorontsov
       [not found] ` <20070802142641.GA6309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
  0 siblings, 1 reply; 6+ messages in thread
From: Anton Vorontsov @ 2007-08-02 14:26 UTC (permalink / raw)
  To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f
  Cc: linuxppc-dev-mnsaURCQ41sdnm+yROfE0A

For MPC8349E input to SPIBRG is SYSCLK, but it's SYSCLK/2 for
MPC8323E (running in so-called "QE mode").

This fixes clocking issues I've noticed recently.

Probably someday mpc83xx_spi->sysclk should be renamed to
mpc83xx_spi->spiclk to be less confusing.

Signed-off-by: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
---
 drivers/spi/spi_mpc83xx.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 0c16a2b..55230f7 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -429,13 +429,17 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
 	mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
 	mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
 	mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
-	mpc83xx_spi->sysclk = pdata->sysclk;
 	mpc83xx_spi->activate_cs = pdata->activate_cs;
 	mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
 	mpc83xx_spi->qe_mode = pdata->qe_mode;
 	mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
 	mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
 
+	if (mpc83xx_spi->qe_mode)
+		mpc83xx_spi->sysclk = pdata->sysclk / 2;
+	else
+		mpc83xx_spi->sysclk = pdata->sysclk;
+
 	mpc83xx_spi->rx_shift = 0;
 	mpc83xx_spi->tx_shift = 0;
 	if (mpc83xx_spi->qe_mode) {
-- 
1.5.0.6

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^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2007-08-06 12:04 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-08-02 14:26 [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2 Anton Vorontsov
     [not found] ` <20070802142641.GA6309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-08-02 15:19   ` Kumar Gala
     [not found]     ` <59836CD3-C46E-4B51-8FFE-5F40107CAA85-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2007-08-02 15:27       ` Anton Vorontsov
2007-08-02 21:47   ` David Brownell
     [not found]     ` <200708021447.22028.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2007-08-03  9:29       ` Kumar Gala
     [not found]         ` <595EE3AF-CDD6-4260-83D9-A3FA3EA1DF95-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2007-08-06 12:04           ` Anton Vorontsov

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