[PATCH] cmd: spi: Permit setting bus frequency

[Lukasz Majewski]

On Fri, 20 Dec 2019 12:44:57 +0100
Marek Vasut <marex at denx.de> wrote:

> 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 at denx.de>
> Cc: Tom Rini <trini at konsulko.com>
> ---
>  cmd/spi.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/cmd/spi.c b/cmd/spi.c
> index 75226fd368..bfa185b6ae 100644
> --- a/cmd/spi.c
> +++ b/cmd/spi.c
> @@ -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>   Lukasz Majewski <lukma at denx.de> - 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"
>  );

Reviewed-by: Lukasz Majewski <lukma at denx.de>


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
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