[PATCH v3 3/3] spi: mxic: patch for octal DTR mode support

[Mark Brown]

On Tue, Apr 20, 2021 at 02:29:39PM +0800, Zhengxun Li wrote:

> -	return spi_mem_default_supports_op(mem, op);
> +	all_false = !op->cmd.dtr && !op->addr.dtr && !op->dummy.dtr &&
> +		    !op->data.dtr;
> +
> +	if (all_false)

This feels like we might want a spi_mem_op_is_dtr() helper?  I can see
other controllers wanting a similar check.
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