[PATCH 04/24] spi: amlogic-spifc-a1: Support per spi-mem operation frequency switches

[Tudor Ambarus]

On 10/25/24 5:14 PM, Miquel Raynal wrote:
> Every ->exec_op() call correctly configures the spi bus speed to the
> maximum allowed frequency for the memory using the constant spi default
> parameter. Since we can now have per-operation constraints, let's use
> the value that comes from the spi-mem operation structure instead. In
> case there is no specific limitation for this operation, the default spi
> device value will be given anyway.
> 
> The per-operation frequency capability is thus advertised to the spi-mem
> core.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> ---
>  drivers/spi/spi-amlogic-spifc-a1.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-amlogic-spifc-a1.c b/drivers/spi/spi-amlogic-spifc-a1.c
> index fadf6667cd51..18c9aa2cbc29 100644
> --- a/drivers/spi/spi-amlogic-spifc-a1.c
> +++ b/drivers/spi/spi-amlogic-spifc-a1.c
> @@ -259,7 +259,7 @@ static int amlogic_spifc_a1_exec_op(struct spi_mem *mem,
>  	size_t data_size = op->data.nbytes;
>  	int ret;
>  
> -	ret = amlogic_spifc_a1_set_freq(spifc, mem->spi->max_speed_hz);
> +	ret = amlogic_spifc_a1_set_freq(spifc, op->max_freq);
>  	if (ret)
>  		return ret;
>  
> @@ -320,6 +320,10 @@ static const struct spi_controller_mem_ops amlogic_spifc_a1_mem_ops = {
>  	.adjust_op_size = amlogic_spifc_a1_adjust_op_size,
>  };

I see the driver sets ctrl->min_speed_hz = SPIFC_A1_MIN_HZ;

Do you want to introduce a struct spi_controller_mem_ops.supports_op and
check that the spimem op freq is not below the controller's minimum freq?