Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=59a0ea5091d309fa8338954b84cf5307dbd83ec9
Commit:     59a0ea5091d309fa8338954b84cf5307dbd83ec9
Parent:     d0a2f82da949283027a7da6a8b2a70ada46e7b55
Author:     Anton Vorontsov <[EMAIL PROTECTED]>
AuthorDate: Thu Jan 24 18:40:03 2008 +0300
Committer:  Kumar Gala <[EMAIL PROTECTED]>
CommitDate: Mon Jan 28 08:32:57 2008 -0600

    spi_mpc83xx: use brg-frequency for SPI in QE
    
    In case of QE we can use brg-frequency (which is qeclk/2).
    Thus no need to divide sysclk in the spi_mpc83xx.
    
    This patch also adds code to use get_brgfreq() on QE chips.
    
    Signed-off-by: Anton Vorontsov <[EMAIL PROTECTED]>
    Acked-by: David Brownell <[EMAIL PROTECTED]>
    Signed-off-by: Kumar Gala <[EMAIL PROTECTED]>
---
 arch/powerpc/sysdev/fsl_soc.c |   46 +++++++++++++++++++++++++++++-----------
 drivers/spi/spi_mpc83xx.c     |    6 +----
 2 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
index 26f7d83..6f81dd5 100644
--- a/arch/powerpc/sysdev/fsl_soc.c
+++ b/arch/powerpc/sysdev/fsl_soc.c
@@ -75,7 +75,7 @@ phys_addr_t get_immrbase(void)
 
 EXPORT_SYMBOL(get_immrbase);
 
-#if defined(CONFIG_CPM2) || defined(CONFIG_8xx)
+#if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
 
 static u32 brgfreq = -1;
 
@@ -100,11 +100,21 @@ u32 get_brgfreq(void)
 
        /* Legacy device binding -- will go away when no users are left. */
        node = of_find_node_by_type(NULL, "cpm");
+       if (!node)
+               node = of_find_compatible_node(NULL, NULL, "fsl,qe");
+       if (!node)
+               node = of_find_node_by_type(NULL, "qe");
+
        if (node) {
                prop = of_get_property(node, "brg-frequency", &size);
                if (prop && size == 4)
                        brgfreq = *prop;
 
+               if (brgfreq == -1 || brgfreq == 0) {
+                       prop = of_get_property(node, "bus-frequency", &size);
+                       if (prop && size == 4)
+                               brgfreq = *prop / 2;
+               }
                of_node_put(node);
        }
 
@@ -1273,22 +1283,32 @@ int __init fsl_spi_init(struct spi_board_info 
*board_infos,
 {
        struct device_node *np;
        unsigned int i;
-       const u32 *sysclk;
+       u32 sysclk = -1;
 
        /* SPI controller is either clocked from QE or SoC clock */
-       np = of_find_compatible_node(NULL, NULL, "fsl,qe");
-       if (!np)
-               np = of_find_node_by_type(NULL, "qe");
+#ifdef CONFIG_QUICC_ENGINE
+       sysclk = get_brgfreq();
+#endif
+       if (sysclk == -1) {
+               const u32 *freq;
+               int size;
 
-       if (!np)
                np = of_find_node_by_type(NULL, "soc");
+               if (!np)
+                       return -ENODEV;
+
+               freq = of_get_property(np, "clock-frequency", &size);
+               if (!freq || size != sizeof(*freq) || *freq == 0) {
+                       freq = of_get_property(np, "bus-frequency", &size);
+                       if (!freq || size != sizeof(*freq) || *freq == 0) {
+                               of_node_put(np);
+                               return -ENODEV;
+                       }
+               }
 
-       if (!np)
-               return -ENODEV;
-
-       sysclk = of_get_property(np, "bus-frequency", NULL);
-       if (!sysclk)
-               return -ENODEV;
+               sysclk = *freq;
+               of_node_put(np);
+       }
 
        for (np = NULL, i = 1;
             (np = of_find_compatible_node(np, "spi", "fsl_spi")) != NULL;
@@ -1305,7 +1325,7 @@ int __init fsl_spi_init(struct spi_board_info 
*board_infos,
 
                memset(res, 0, sizeof(res));
 
-               pdata.sysclk = *sysclk;
+               pdata.sysclk = sysclk;
 
                prop = of_get_property(np, "reg", NULL);
                if (!prop)
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 4580b9c..04f7cd9 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -436,11 +436,7 @@ static int __init mpc83xx_spi_probe(struct platform_device 
*dev)
        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->spibrg = pdata->sysclk / 2;
-       else
-               mpc83xx_spi->spibrg = pdata->sysclk;
+       mpc83xx_spi->spibrg = pdata->sysclk;
 
        mpc83xx_spi->rx_shift = 0;
        mpc83xx_spi->tx_shift = 0;
-
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