[PATCH v2] powerpc: i2c-mpc: make I2C bus speed configurable
Wolfgang Grandegger
wg at grandegger.com
Thu Apr 2 00:13:41 EST 2009
This patch makes the I2C bus speed configurable by using the I2C node
property "clock-frequency". If the property is not defined, the old
fixed clock settings will be used for backward compatibility.
The generic I2C clock properties, especially the CPU-specific source
clock pre-scaler are defined via the OF match table:
static const struct of_device_id mpc_i2c_of_match[] = {
...
{.compatible = "fsl,mpc8543-i2c",
.data = &(struct fsl_i2c_match_data) {
.setclock = mpc_i2c_setclock_8xxx,
.prescaler = 2,
},
},
The "data" field defines the relevant I2C setclock function and the
relevant prescaler for the I2C source clock frequency.
It uses arch-specific tables and functions to determine resonable
Freqency Divider Register (fdr) values for MPC83xx, MPC85xx, MPC86xx,
MPC5200 and MPC5200B.
The i2c->flags field and the corresponding FSL_I2C_DEV_* definitions
have been removed as they are obsolete.
Furthermore dev_dbg() and dev_info() are now used to profit from a more
comprehensive output.
Signed-off-by: Wolfgang Grandegger <wg at grandegger.com>
---
Documentation/powerpc/dts-bindings/fsl/i2c.txt | 43 +++++--
arch/powerpc/include/asm/mpc52xx.h | 11 +
arch/powerpc/platforms/52xx/mpc52xx_common.c | 57 ++++++++++
arch/powerpc/sysdev/fsl_soc.c | 90 ++++++++++++++++
arch/powerpc/sysdev/fsl_soc.h | 12 ++
drivers/i2c/busses/i2c-mpc.c | 138 ++++++++++++++++++-------
include/linux/fsl_devices.h | 9 -
7 files changed, 302 insertions(+), 58 deletions(-)
Index: linux-2.6/drivers/i2c/busses/i2c-mpc.c
===================================================================
--- linux-2.6.orig/drivers/i2c/busses/i2c-mpc.c 2009-03-31 21:29:21.000000000 +0200
+++ linux-2.6/drivers/i2c/busses/i2c-mpc.c 2009-04-01 14:56:43.824970544 +0200
@@ -20,12 +20,15 @@
#include <linux/of_platform.h>
#include <linux/of_i2c.h>
-#include <asm/io.h>
+#include <linux/io.h>
#include <linux/fsl_devices.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <asm/mpc52xx.h>
+#include <sysdev/fsl_soc.h>
+
#define DRV_NAME "mpc-i2c"
#define MPC_I2C_FDR 0x04
@@ -50,12 +53,19 @@
#define CSR_RXAK 0x01
struct mpc_i2c {
+ struct device *dev;
void __iomem *base;
u32 interrupt;
wait_queue_head_t queue;
struct i2c_adapter adap;
int irq;
- u32 flags;
+};
+
+struct fsl_i2c_match_data {
+ void (*setclock)(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler);
+ u32 prescaler;
};
static __inline__ void writeccr(struct mpc_i2c *i2c, u32 x)
@@ -105,7 +115,7 @@
while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {
schedule();
if (time_after(jiffies, orig_jiffies + timeout)) {
- pr_debug("I2C: timeout\n");
+ dev_dbg(i2c->dev, "timeout\n");
writeccr(i2c, 0);
result = -EIO;
break;
@@ -119,10 +129,10 @@
(i2c->interrupt & CSR_MIF), timeout * HZ);
if (unlikely(result < 0)) {
- pr_debug("I2C: wait interrupted\n");
+ dev_dbg(i2c->dev, "wait interrupted\n");
writeccr(i2c, 0);
} else if (unlikely(!(i2c->interrupt & CSR_MIF))) {
- pr_debug("I2C: wait timeout\n");
+ dev_dbg(i2c->dev, "wait timeout\n");
writeccr(i2c, 0);
result = -ETIMEDOUT;
}
@@ -135,17 +145,17 @@
return result;
if (!(x & CSR_MCF)) {
- pr_debug("I2C: unfinished\n");
+ dev_dbg(i2c->dev, "unfinished\n");
return -EIO;
}
if (x & CSR_MAL) {
- pr_debug("I2C: MAL\n");
+ dev_dbg(i2c->dev, "MAL\n");
return -EIO;
}
if (writing && (x & CSR_RXAK)) {
- pr_debug("I2C: No RXAK\n");
+ dev_dbg(i2c->dev, "No RXAK\n");
/* generate stop */
writeccr(i2c, CCR_MEN);
return -EIO;
@@ -153,16 +163,30 @@
return 0;
}
-static void mpc_i2c_setclock(struct mpc_i2c *i2c)
-{
- /* Set clock and filters */
- if (i2c->flags & FSL_I2C_DEV_SEPARATE_DFSRR) {
- writeb(0x31, i2c->base + MPC_I2C_FDR);
- writeb(0x10, i2c->base + MPC_I2C_DFSRR);
- } else if (i2c->flags & FSL_I2C_DEV_CLOCK_5200)
- writeb(0x3f, i2c->base + MPC_I2C_FDR);
- else
- writel(0x1031, i2c->base + MPC_I2C_FDR);
+static void mpc_i2c_setclock_52xx(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler)
+{
+ int fdr = mpc52xx_i2c_get_fdr(node, clock, prescaler);
+
+ if (fdr < 0)
+ fdr = 0x3f; /* backward compatibility */
+ writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
+ dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
+}
+
+static void mpc_i2c_setclock_8xxx(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler)
+{
+ int fdr = fsl_i2c_get_fdr(node, clock, prescaler);
+
+ if (fdr < 0)
+ fdr = 0x1031; /* backward compatibility */
+ writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
+ writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
+ dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
+ clock, fdr >> 8, fdr & 0xff);
}
static void mpc_i2c_start(struct mpc_i2c *i2c)
@@ -267,12 +291,12 @@
/* Allow bus up to 1s to become not busy */
while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
if (signal_pending(current)) {
- pr_debug("I2C: Interrupted\n");
+ dev_dbg(i2c->dev, "interrupted\n");
writeccr(i2c, 0);
return -EINTR;
}
if (time_after(jiffies, orig_jiffies + HZ)) {
- pr_debug("I2C: timeout\n");
+ dev_dbg(i2c->dev, "timeout\n");
if (readb(i2c->base + MPC_I2C_SR) ==
(CSR_MCF | CSR_MBB | CSR_RXAK))
mpc_i2c_fixup(i2c);
@@ -283,9 +307,10 @@
for (i = 0; ret >= 0 && i < num; i++) {
pmsg = &msgs[i];
- pr_debug("Doing %s %d bytes to 0x%02x - %d of %d messages\n",
- pmsg->flags & I2C_M_RD ? "read" : "write",
- pmsg->len, pmsg->addr, i + 1, num);
+ dev_dbg(i2c->dev,
+ "doing %s %d bytes to 0x%02x - %d of %d messages\n",
+ pmsg->flags & I2C_M_RD ? "read" : "write",
+ pmsg->len, pmsg->addr, i + 1, num);
if (pmsg->flags & I2C_M_RD)
ret =
mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
@@ -316,13 +341,18 @@
static int __devinit fsl_i2c_probe(struct of_device *op, const struct of_device_id *match)
{
- int result = 0;
struct mpc_i2c *i2c;
+ const u32 *prop;
+ u32 clock = 0;
+ int result = 0;
+ int plen;
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
+ i2c->dev = &op->dev; /* for device printouts */
+
init_waitqueue_head(&i2c->queue);
i2c->base = of_iomap(op->node, 0);
@@ -343,14 +373,20 @@
}
if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
- if (of_get_property(op->node, "dfsrr", NULL))
- i2c->flags |= FSL_I2C_DEV_SEPARATE_DFSRR;
-
- if (of_device_is_compatible(op->node, "fsl,mpc5200-i2c") ||
- of_device_is_compatible(op->node, "mpc5200-i2c"))
- i2c->flags |= FSL_I2C_DEV_CLOCK_5200;
-
- mpc_i2c_setclock(i2c);
+ prop = of_get_property(op->node, "clock-frequency", &plen);
+ if (prop && plen == sizeof(u32))
+ clock = *prop;
+
+ if (match->data) {
+ struct fsl_i2c_match_data *data =
+ (struct fsl_i2c_match_data *)match->data;
+ data->setclock(op->node, i2c, clock, data->prescaler);
+ } else {
+ /* Backwards compatibility */
+ if (of_get_property(op->node, "dfsrr", NULL))
+ mpc_i2c_setclock_8xxx(op->node, i2c,
+ clock, 0);
+ }
}
dev_set_drvdata(&op->dev, i2c);
@@ -396,9 +432,43 @@
};
static const struct of_device_id mpc_i2c_of_match[] = {
- {.compatible = "fsl-i2c",},
+ {.compatible = "mpc5200-i2c",
+ .data = &(struct fsl_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_52xx,
+ },
+ },
+ {.compatible = "fsl,mpc5200b-i2c",
+ .data = &(struct fsl_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_52xx,
+ },
+ },
+ {.compatible = "fsl,mpc5200-i2c",
+ .data = &(struct fsl_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_52xx,
+ },
+ },
+ {.compatible = "fsl,mpc8313-i2c",
+ .data = &(struct fsl_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_8xxx,
+ },
+ },
+ {.compatible = "fsl,mpc8543-i2c",
+ .data = &(struct fsl_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_8xxx,
+ .prescaler = 2,
+ },
+ },
+ {.compatible = "fsl,mpc8544-i2c",
+ .data = &(struct fsl_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_8xxx,
+ .prescaler = 3,
+ },
+ /* Backward compatibility */
+ },
+ {.compatible = "fsl-i2c", },
{},
};
+
MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
@@ -419,7 +489,7 @@
rv = of_register_platform_driver(&mpc_i2c_driver);
if (rv)
- printk(KERN_ERR DRV_NAME
+ printk(KERN_ERR DRV_NAME
" of_register_platform_driver failed (%i)\n", rv);
return rv;
}
Index: linux-2.6/arch/powerpc/sysdev/fsl_soc.c
===================================================================
--- linux-2.6.orig/arch/powerpc/sysdev/fsl_soc.c 2009-03-31 21:27:52.000000000 +0200
+++ linux-2.6/arch/powerpc/sysdev/fsl_soc.c 2009-04-01 12:09:18.796719327 +0200
@@ -39,7 +39,7 @@
#include <sysdev/fsl_soc.h>
#include <mm/mmu_decl.h>
#include <asm/cpm2.h>
-
+#define DEBUG
extern void init_fcc_ioports(struct fs_platform_info*);
extern void init_fec_ioports(struct fs_platform_info*);
extern void init_smc_ioports(struct fs_uart_platform_info*);
@@ -102,6 +102,94 @@
}
EXPORT_SYMBOL(fsl_get_sys_freq);
+#ifdef CONFIG_I2C_MPC
+static const struct fsl_i2c_8xxx_divider {
+ u16 divider;
+ u16 fdr; /* including dfsrr */
+} fsl_i2c_8xxx_dividers[] = {
+ {160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
+ {288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
+ {416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
+ {544, 0x0b03}, {576, 0x0104}, {608, 0x1603}, {640, 0x0105},
+ {672, 0x2003}, {704, 0x0b05}, {736, 0x2b03}, {768, 0x0106},
+ {800, 0x3603}, {832, 0x0b06}, {896, 0x012a}, {960, 0x0107},
+ {1024, 0x012b}, {1088, 0x1607}, {1152, 0x0108}, {1216, 0x2b07},
+ {1280, 0x0109}, {1408, 0x1609}, {1536, 0x010a}, {1664, 0x160a},
+ {1792, 0x012e}, {1920, 0x010b}, {2048, 0x012f}, {2176, 0x2b0b},
+ {2304, 0x010c}, {2560, 0x010d}, {2816, 0x2b0d}, {3072, 0x010e},
+ {3328, 0x2b0e}, {3584, 0x0132}, {3840, 0x010f}, {4096, 0x0133},
+ {4608, 0x0110}, {5120, 0x0111}, {6144, 0x0112}, {7168, 0x0136},
+ {7680, 0x0113}, {8192, 0x0137}, {9216, 0x0114}, {10240, 0x0115},
+ {12288, 0x0116}, {14336, 0x013a}, {15360, 0x0117}, {16384, 0x013b},
+ {18432, 0x0118}, {20480, 0x0119}, {24576, 0x011a}, {28672, 0x013e},
+ {30720, 0x011b}, {32768, 0x013f}, {36864, 0x011c}, {40960, 0x011d},
+ {49152, 0x011e}, {61440, 0x011f}
+};
+
+u32 fsl_i2c_get_sec_cfg(void)
+{
+ struct device_node *node = NULL;
+ u32 __iomem *reg;
+ u32 val = 0;
+
+ node = of_find_node_by_name(NULL, "global-utilities");
+ if (node) {
+ const u32 *prop = of_get_property(node, "reg", NULL);
+ if (prop) {
+ /*
+ * Map and check POR Device Status Register 2
+ * (PORDEVSR2) at 0xE0014
+ */
+ reg = ioremap(get_immrbase() + *prop + 0x14, 0x4);
+ if (!reg)
+ printk(KERN_ERR
+ "Error: couldn't map PORDEVSR2\n");
+ else
+ val = in_be32(reg) & 0x00000080; /* sec-cfg */
+ iounmap(reg);
+ }
+ }
+ if (node)
+ of_node_put(node);
+
+ return val;
+}
+
+int fsl_i2c_get_fdr(struct device_node *node, u32 clock, u32 prescaler)
+{
+ const struct fsl_i2c_8xxx_divider *div = NULL;
+ u32 divider;
+ int i;
+
+ if (!clock)
+ return -EINVAL;
+
+ /* Determine proper divider value */
+ if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
+ prescaler = fsl_i2c_get_sec_cfg() ? 3 : 2;
+ if (!prescaler)
+ prescaler = 1;
+
+ divider = fsl_get_sys_freq() / clock / prescaler;
+
+ pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",
+ fsl_get_sys_freq(), clock, divider);
+
+ /*
+ * We want to choose an FDR/DFSR that generates an I2C bus speed that
+ * is equal to or lower than the requested speed.
+ */
+ for (i = 0; i < ARRAY_SIZE(fsl_i2c_8xxx_dividers); i++) {
+ div = &fsl_i2c_8xxx_dividers[i];
+ if (div->divider >= divider)
+ break;
+ }
+
+ return div ? (int)div->fdr : -EINVAL;
+}
+EXPORT_SYMBOL(fsl_i2c_get_fdr);
+#endif /* CONFIG_I2C_MPC */
+
#if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
static u32 brgfreq = -1;
Index: linux-2.6/include/linux/fsl_devices.h
===================================================================
--- linux-2.6.orig/include/linux/fsl_devices.h 2009-03-31 21:27:52.000000000 +0200
+++ linux-2.6/include/linux/fsl_devices.h 2009-04-01 11:22:36.677719938 +0200
@@ -60,15 +60,6 @@
#define FSL_GIANFAR_BRD_HAS_PHY_INTR 0x00000001 /* set or use a timer */
#define FSL_GIANFAR_BRD_IS_REDUCED 0x00000002 /* Set if RGMII, RMII */
-struct fsl_i2c_platform_data {
- /* device specific information */
- u32 device_flags;
-};
-
-/* Flags related to I2C device features */
-#define FSL_I2C_DEV_SEPARATE_DFSRR 0x00000001
-#define FSL_I2C_DEV_CLOCK_5200 0x00000002
-
enum fsl_usb2_operating_modes {
FSL_USB2_MPH_HOST,
FSL_USB2_DR_HOST,
Index: linux-2.6/arch/powerpc/platforms/52xx/mpc52xx_common.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/52xx/mpc52xx_common.c 2009-03-31 21:27:52.000000000 +0200
+++ linux-2.6/arch/powerpc/platforms/52xx/mpc52xx_common.c 2009-04-01 12:05:33.945719636 +0200
@@ -225,3 +225,60 @@
while (1);
}
+
+/**
+ * fsl_i2c_get_fdr: get calculate and return I2 frequency divider register
+ */
+static const struct mpc52xx_i2c_divider {
+ u16 divider;
+ u16 fdr; /* including dfsrr */
+} mpc52xx_i2c_dividers[] = {
+ {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
+ {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
+ {36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
+ {52, 0x63}, {56, 0x29}, {60, 0x41}, {64, 0x2a},
+ {68, 0x07}, {72, 0x2b}, {80, 0x2c}, {88, 0x09},
+ {96, 0x2d}, {104, 0x0a}, {112, 0x2e}, {120, 0x81},
+ {128, 0x2f}, {136, 0x47}, {144, 0x0c}, {160, 0x30},
+ {176, 0x49}, {192, 0x31}, {208, 0x4a}, {224, 0x32},
+ {240, 0x0f}, {256, 0x33}, {272, 0x87}, {288, 0x10},
+ {320, 0x34}, {352, 0x89}, {384, 0x35}, {416, 0x8a},
+ {448, 0x36}, {480, 0x13}, {512, 0x37}, {576, 0x14},
+ {640, 0x38}, {768, 0x39}, {896, 0x3a}, {960, 0x17},
+ {1024, 0x3b}, {1152, 0x18}, {1280, 0x3c}, {1536, 0x3d},
+ {1792, 0x3e}, {1920, 0x1b}, {2048, 0x3f}, {2304, 0x1c},
+ {2560, 0x1d}, {3072, 0x1e}, {3584, 0x7e}, {3840, 0x1f},
+ {4096, 0x7f}, {4608, 0x5c}, {5120, 0x5d}, {6144, 0x5e},
+ {7168, 0xbe}, {7680, 0x5f}, {8192, 0xbf}, {9216, 0x9c},
+ {10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
+};
+
+int mpc52xx_i2c_get_fdr(struct device_node *node, u32 clock, int prescaler)
+{
+ const struct mpc52xx_i2c_divider *div = NULL;
+ unsigned int pvr = mfspr(SPRN_PVR);
+ u32 divider;
+ int i;
+
+ if (!clock)
+ return -EINVAL;
+
+ /* Determine divider value */
+ divider = mpc52xx_find_ipb_freq(node) / clock;
+
+ /*
+ * We want to choose an FDR/DFSR that generates an I2C bus speed that
+ * is equal to or lower than the requested speed.
+ */
+ for (i = 0; i < ARRAY_SIZE(mpc52xx_i2c_dividers); i++) {
+ div = &mpc52xx_i2c_dividers[i];
+ /* Old MPC5200 rev A CPUs do not support the high bits */
+ if (div->fdr & 0xc0 && pvr == 0x80822011)
+ continue;
+ if (div->divider >= divider)
+ break;
+ }
+
+ return div ? (int)div->fdr : -EINVAL;
+}
+EXPORT_SYMBOL(mpc52xx_i2c_get_fdr);
Index: linux-2.6/arch/powerpc/include/asm/mpc52xx.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/mpc52xx.h 2009-03-17 10:28:10.000000000 +0100
+++ linux-2.6/arch/powerpc/include/asm/mpc52xx.h 2009-04-01 12:30:00.389718130 +0200
@@ -287,6 +287,17 @@
static inline void mpc52xx_setup_pci(void) { }
#endif
+#ifdef CONFIG_PPC_MPC52xx
+extern int mpc52xx_i2c_get_fdr(struct device_node *node,
+ u32 clock, int prescaler);
+#else
+static inline int mpc52xx_i2c_get_fdr(struct device_node *node,
+ u32 clock, u32 prescaler)
+{
+ return -EINVAL;
+}
+#endif
+
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_PM
Index: linux-2.6/Documentation/powerpc/dts-bindings/fsl/i2c.txt
===================================================================
--- linux-2.6.orig/Documentation/powerpc/dts-bindings/fsl/i2c.txt 2009-03-31 21:35:51.000000000 +0200
+++ linux-2.6/Documentation/powerpc/dts-bindings/fsl/i2c.txt 2009-04-01 12:27:51.962721274 +0200
@@ -7,8 +7,10 @@
Recommended properties :
- - compatible : Should be "fsl-i2c" for parts compatible with
- Freescale I2C specifications.
+ - compatible : compatibility list with 2 entries, the first should
+ be "fsl,CHIP-i2c" where CHIP is the name of a compatible processor,
+ e.g. mpc8313, mpc8443, mpc8444 or mpc5200b. The second should be
+ "fsl-i2c".
- interrupts : <a b> where a is the interrupt number and b is a
field that represents an encoding of the sense and level
information for the interrupt. This should be encoded based on
@@ -16,19 +18,32 @@
controller you have.
- interrupt-parent : the phandle for the interrupt controller that
services interrupts for this device.
- - dfsrr : boolean; if defined, indicates that this I2C device has
- a digital filter sampling rate register
- - fsl5200-clocking : boolean; if defined, indicated that this device
- uses the FSL 5200 clocking mechanism.
- fsl,preserve-clocking : boolean; if defined, the clock settings
from the bootloader are preserved (not touched).
+ - clock-frequency : desired I2C bus clock frequency in Hz.
-Example :
- i2c at 3000 {
- interrupt-parent = <40000>;
- interrupts = <1b 3>;
- reg = <3000 18>;
- device_type = "i2c";
- compatible = "fsl-i2c";
- dfsrr;
+Examples :
+
+ i2c at 3d00 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "fsl,mpc5200b-i2c","fsl,mpc5200-i2c","fsl-i2c";
+ cell-index = <0>;
+ reg = <0x3d00 0x40>;
+ interrupts = <2 15 0>;
+ interrupt-parent = <&mpc5200_pic>;
+ fsl,preserve-clocking;
+ };
+
+ i2c at 3100 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ cell-index = <1>;
+ compatible = "fsl,mpc8544-i2c", "fsl-i2c";
+ reg = <0x3100 0x100>;
+ interrupts = <43 2>;
+ interrupt-parent = <&mpic>;
+ clock-frequency = <400000>;
};
+
+
Index: linux-2.6/arch/powerpc/sysdev/fsl_soc.h
===================================================================
--- linux-2.6.orig/arch/powerpc/sysdev/fsl_soc.h 2009-04-01 14:28:43.000000000 +0200
+++ linux-2.6/arch/powerpc/sysdev/fsl_soc.h 2009-04-01 14:29:10.629721056 +0200
@@ -14,6 +14,18 @@
#endif
extern u32 fsl_get_sys_freq(void);
+
+#ifdef CONFIG_FSL_SOC
+extern int fsl_i2c_get_fdr(struct device_node *node,
+ u32 clock, u32 divider);
+#else
+static inline int fsl_i2c_get_fdr(struct device_node *node,
+ u32 clock, u32 prescaler)
+{
+ return -EINVAL;
+}
+#endif
+
struct spi_board_info;
struct device_node;
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