Re: [PATCH 2/4] spi: sg2044-nor: Honor SPI clock limits

[Mark Brown]

On Thu, Sep 17, 2026 at 10:29:20PM +0800, Han Gao wrote:
> The fixed divider ignores device and operation clock limits. Calculate
> the divider before each transfer so SCK does not exceed either limit.

> +static int sg2044_spifmc_set_speed(struct sg2044_spifmc *spifmc,
> +				   unsigned int speed_hz)
> +{
> +	unsigned long rate = clk_get_rate(spifmc->clk);
> +	u64 div;
> +	u32 reg;
> +
> +	if (!rate || !speed_hz)
> +		return -EINVAL;

Specifying a maximum speed is optional so we might have a currently
working setup with one omitted.  The driver should just go with the
maximum speed it supports in that case.

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