[U-Boot] [PATCH 18/30] i2c: add i2c deblock sequence before and after every mux config

Valentin Longchamp
2011-04-08T14:24:08Z

From: Stefan Bigler <stefan.bigler@keymile.com>

To make sure that the mux can be configured a deblocking sequence
is done before the mux configuration. After the mux switch the new leaf
of, the i2c tree must be again deblocked.

Signed-off-by: Stefan Bigler <stefan.bigler@keymile.com>
Acked-by: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
cc: Detlev Zundel <dzu@denx.de>
cc: Prafulla Wadaskar <prafulla@marvell.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
---
common/cmd_i2c.c | 12 ++++++++++++
include/i2c.h | 2 --
2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index c272b0d..d913e13 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -132,6 +132,14 @@ DECLARE_GLOBAL_DATA_PTR;

#define DISP_LINE_LEN 16

+/* implement possible board specific board init */
+void __def_i2c_init_board(void)
+{
+ return;
+}
+void i2c_init_board(void)
+ __attribute__((weak, alias("__def_i2c_init_board")));
+
/* TODO: Implement architecture-specific get/set functions */
unsigned int __def_i2c_get_bus_speed(void)
{
@@ -1541,6 +1549,8 @@ int i2x_mux_select_mux(int bus)

mux = dev->mux;
while (mux != NULL) {
+ /* do deblocking on each level of mux, before mux config */
+ i2c_init_board();
if (i2c_write(mux->chip, 0, 0, &mux->channel, 1) != 0) {
printf ("Error setting Mux: chip:%x channel: \
%x\n", mux->chip, mux->channel);
@@ -1548,6 +1558,8 @@ int i2x_mux_select_mux(int bus)
}
mux = mux->next;
}
+ /* do deblocking on each level of mux and after mux config */
+ i2c_init_board();
return 0;
}
#endif /* CONFIG_I2C_MUX */
diff --git a/include/i2c.h b/include/i2c.h
index cd23c8a..8ceb4c8 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -108,9 +108,7 @@
* repeatedly to change the speed and slave addresses.
*/
void i2c_init(int speed, int slaveaddr);
-#ifdef CONFIG_SYS_I2C_INIT_BOARD
void i2c_init_board(void);
-#endif
#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
void i2c_board_late_init(void);
#endif
--
1.7.0.5