[U-Boot] [PATCH] I2C: Add support for multiple I2C busses for SNTP (effect to RTC)

[Stephan Linz]

This patch switches to the desired I2C bus when the SNTP
network service is called. This can be configured using the
CONFIG_SYS_RTC_BUS_NUM define.

In my eyes this is a bad and quick hack, but the same as
was making for the date and dtt commands (commit: 0dc018e).
The right way would be to move all the hardware specific i2c
code down to the rtc driver layer.

Signed-off-by: Stephan Linz <linz at li-pro.net>
---
 net/sntp.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/net/sntp.c b/net/sntp.c
index 76c10ec..5544570 100644
--- a/net/sntp.c
+++ b/net/sntp.c
@@ -10,6 +10,14 @@
 #include <net.h>
 #include <rtc.h>
 
+/*
+ * FIXME: The i2c dependency should move into the RTC drivers itself.
+ * This higher network layer must not know about hardware specifics!
+ */
+#if defined(CONFIG_CMD_DATE)
+#include <i2c.h>
+#endif
+
 #include "sntp.h"
 
 #define SNTP_TIMEOUT 10000UL
@@ -53,6 +61,9 @@ SntpHandler (uchar *pkt, unsigned dest, unsigned src, unsigned len)
 	struct sntp_pkt_t *rpktp = (struct sntp_pkt_t *)pkt;
 	struct rtc_time tm;
 	ulong seconds;
+#if defined(CONFIG_CMD_DATE)
+	int old_bus;
+#endif
 
 	debug("%s\n", __func__);
 
@@ -66,7 +77,14 @@ SntpHandler (uchar *pkt, unsigned dest, unsigned src, unsigned len)
 
 	to_tm(ntohl(seconds) - 2208988800UL + NetTimeOffset, &tm);
 #if defined(CONFIG_CMD_DATE)
+	/* switch to correct I2C bus */
+	old_bus = I2C_GET_BUS();
+	I2C_SET_BUS(CONFIG_SYS_RTC_BUS_NUM);
+
 	rtc_set (&tm);
+
+	/* switch back to original I2C bus */
+	I2C_SET_BUS(old_bus);
 #endif
 	printf ("Date: %4d-%02d-%02d Time: %2d:%02d:%02d\n",
 		tm.tm_year, tm.tm_mon, tm.tm_mday,
-- 
1.6.0.4