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cmd: spi: Permit setting bus frequency

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The 'sspi' command hard-coded 1 MHz bus frequency for all transmissions.
Allow changing that at runtime by specifying '@freq' bus frequency in Hz.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Marek Vasut 2019-12-20 12:44:57 +01:00 committed by Jagan Teki
parent bfcd9298b2
commit 6954756a15
1 changed files with 10 additions and 4 deletions
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14
cmd/spi.c
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@ -28,6 +28,7 @@
static unsigned int bus;
static unsigned int cs;
static unsigned int mode;
static unsigned int freq;
static int bitlen;
static uchar dout[MAX_SPI_BYTES];
static uchar din[MAX_SPI_BYTES];
@ -45,12 +46,12 @@ static int do_spi_xfer(int bus, int cs)
str = strdup(name);
if (!str)
return -ENOMEM;
ret = spi_get_bus_and_cs(bus, cs, 1000000, mode, "spi_generic_drv",
ret = spi_get_bus_and_cs(bus, cs, freq, mode, "spi_generic_drv",
str, &dev, &slave);
if (ret)
return ret;
#else
slave = spi_setup_slave(bus, cs, 1000000, mode);
slave = spi_setup_slave(bus, cs, freq, mode);
if (!slave) {
printf("Invalid device %d:%d\n", bus, cs);
return -EINVAL;
@ -106,6 +107,8 @@ int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
* We use the last specified parameters, unless new ones are
* entered.
*/
if (freq == 0)
freq = 1000000;
if ((flag & CMD_FLAG_REPEAT) == 0)
{
@ -119,7 +122,9 @@ int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
bus = CONFIG_DEFAULT_SPI_BUS;
}
if (*cp == '.')
mode = simple_strtoul(cp+1, NULL, 10);
mode = simple_strtoul(cp+1, &cp, 10);
if (*cp == '@')
freq = simple_strtoul(cp+1, &cp, 10);
}
if (argc >= 3)
bitlen = simple_strtoul(argv[2], NULL, 10);
@ -159,10 +164,11 @@ int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
U_BOOT_CMD(
sspi, 5, 1, do_spi,
"SPI utility command",
"[<bus>:]<cs>[.<mode>] <bit_len> <dout> - Send and receive bits\n"
"[<bus>:]<cs>[.<mode>][@<freq>] <bit_len> <dout> - Send and receive bits\n"
"<bus> - Identifies the SPI bus\n"
"<cs> - Identifies the chip select\n"
"<mode> - Identifies the SPI mode to use\n"
"<freq> - Identifies the SPI bus frequency in Hz\n"
"<bit_len> - Number of bits to send (base 10)\n"
"<dout> - Hexadecimal string that gets sent"
);