[PATCH v2 4/7] net: phy: add helper for mapping RGMII link speed to clock rate

[Andrew Lunn]

On Sun, Aug 18, 2024 at 09:50:46PM +0000, Jan Petrous (OSS) wrote:
> The helper rgmii_clock() implemented Russel's hint during stmmac
> glue driver review:
> 
> ---
> We seem to have multiple cases of very similar logic in lots of stmmac
> platform drivers, and I think it's about time we said no more to this.
> So, what I think we should do is as follows:
> 
> add the following helper - either in stmmac, or more generically
> (phylib? - in which case its name will need changing.)
> 
> static long stmmac_get_rgmii_clock(int speed)
> {
> 	switch (speed) {
> 	case SPEED_10:
> 		return 2500000;
> 
> 	case SPEED_100:
> 		return 25000000;
> 
> 	case SPEED_1000:
> 		return 125000000;
> 
> 	default:
> 		return -ENVAL;
> 	}
> }
> 
> Then, this can become:
> 
> 	long tx_clk_rate;
> 
> 	...
> 
> 	tx_clk_rate = stmmac_get_rgmii_clock(speed);
> 	if (tx_clk_rate < 0) {
> 		dev_err(gmac->dev, "Unsupported/Invalid speed: %d\n", speed);
> 		return;
> 	}
> 
> 	ret = clk_set_rate(gmac->tx_clk, tx_clk_rate);
> ---
> 
> Signed-off-by: Jan Petrous (OSS) <jan.petrous at oss.nxp.com>

This Signed-off-by: needs to be above the first ---, otherwise it gets
discard.

When you repost, please do try to get threading correct.

    Andrew

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