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

[Heiko Schocher]

Hello Stephan,

added Ben Warren to cc: because this is a change in net,
which also falls in his area of responsibility ...

Stephan Linz wrote:
> 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.

Yes, thats would the best way, but why you don;t go this
way? Beside of that, this patch look good to me ...

> 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,

bye
Heiko
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