On 08/25/2015 01:30 AM, shh.xie@gmail.com wrote:

From: Shaohui Xie Shaohui.Xie@freescale.com

A U-boot CMD vdd_read is implemented to read Core voltage.

Signed-off-by: Shaohui Xie Shaohui.Xie@freescale.com

board/freescale/t4qds/t4240qds.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)

diff --git a/board/freescale/t4qds/t4240qds.c b/board/freescale/t4qds/t4240qds.c index 4f2cccd..56273e4 100644 --- a/board/freescale/t4qds/t4240qds.c +++ b/board/freescale/t4qds/t4240qds.c @@ -887,8 +887,38 @@ static int do_vdd_adjust(cmd_tbl_t *cmdtp, return 0; }

+static int do_vdd_read(cmd_tbl_t *cmdtp,

•        int flag, int argc,
  

•        char * const argv[])
  

+{

• int vdd, ret;
• if (argc < 1)

• return CMD_RET_USAGE;
  

• ret = select_i2c_ch_pca9547(I2C_MUX_CH_VOL_MONITOR);
• if (ret) {

• printf("VID: I2c failed to switch channel\n");
  

• return 0;
  

• }
• vdd = read_voltage();
• if (vdd < 0)

• printf("VID: Could not read voltage\n");
  

• else

• printf("VID: Core voltage is at %d mV\n", vdd);
  

• return 0;

+}

U_BOOT_CMD( vdd_override, 2, 0, do_vdd_adjust, "Override VDD", "- override with the voltage specified in mV, eg. 1050" );

+U_BOOT_CMD(

• vdd_read, 1, 0, do_vdd_read,
• "read VDD",
• " - Read the voltage specified in mV"

+)

Can you explain why you need this command? You already get the voltage if you run bdinfo. If you override vdd, you also get a print.

York