[U-Boot] [PATCH] rtc: imxdi: Initial support

[Stefano Babic]

On 20/07/2012 16:24, Benoît Thébaudeau wrote:
> Add support for Freescale's i.MX DryIce RTC, present on i.MX25.
> 
> Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>
> Cc: Wolfgang Denk <wd at denx.de>
> Cc: Stefano Babic <sbabic at denx.de>
> ---

Hi Benoit,


just a few comments.

> +
> +/*
> + * Date & Time support for Freescale i.MX DryIce RTC
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <rtc.h>
> +
> +#if defined(CONFIG_CMD_DATE)
> +
> +#include <asm/io.h>
> +#include <asm/arch/imx-regs.h>
> +
> +/* DryIce Register Definitions */
> +
> +#define DTCMR     0x00           /* Time Counter MSB Reg */
> +#define DTCLR     0x04           /* Time Counter LSB Reg */
> +
> +#define DCAMR     0x08           /* Clock Alarm MSB Reg */
> +#define DCALR     0x0c           /* Clock Alarm LSB Reg */

U-Boot as rule does not allow usage of start address + offset to access
internal registers. Instead of that, please define a proper C structure
with the register's layout. This should be fixed globally for all read /
write accesses.

> +/*
> + * This function attempts to clear the dryice write-error flag.
> + *
> + * A dryice write error is similar to a bus fault and should not occur in
> + * normal operation.  Clearing the flag requires another write, so the root
> + * cause of the problem may need to be fixed before the flag can be cleared.
> + */
> +static void clear_write_error(void)
> +{
> +	int cnt;
> +
> +	puts("### Warning: RTC - Register write error!\n");
> +
> +	/* clear the write error flag */
> +	__raw_writel(DSR_WEF, IMX_DRYICE_BASE + DSR);

Ditto

> +int rtc_get(struct rtc_time *tmp)
> +{
> +	unsigned long now;
> +	int rc;
> +
> +	rc = di_init();

Why is di_init always called ? Should be not checked if it is was
already initialized and the function should be called only once ?

Best regards,
Stefano Babic

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