linux-kernel - Re: [PATCH 2/8] phy: Introduce Qualcomm ethernet uniphy driver

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Date: Tue, 23 Jan 2024 23:58:26 +0800
From: Ziyang Huang <hzyitc@...look.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com,
 richardcochran@...il.com, p.zabel@...gutronix.de, matthias.bgg@...il.com,
 angelogioacchino.delregno@...labora.com, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/8] phy: Introduce Qualcomm ethernet uniphy driver

在 2024/1/21 20:42, Ziyang Huang 写道:
> +#define rmwl(addr, mask, val) \
> +	writel(((readl(addr) & ~(mask)) | ((val) & (mask))), addr)
> +
> +static int cmn_init(struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	void __iomem *cmn_base;
> +	void __iomem *tcsr_base;
> +	u32 val;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cmn");
> +	if (!res)
> +		return 0;
> +
> +	cmn_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR_OR_NULL(cmn_base))
> +		return PTR_ERR(cmn_base);
> +
> +	/* For IPQ50xx, tcsr is necessary to enable cmn block */
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcsr");
> +	if (res) {
> +		tcsr_base = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR_OR_NULL(tcsr_base))
> +			return PTR_ERR(tcsr_base);
> +
> +		rmwl((tcsr_base + TCSR_ETH_CMN), TCSR_ETH_CMN_ENABLE,
> +		     TCSR_ETH_CMN_ENABLE);
> +	}
> +
> +	rmwl((cmn_base + CMN_PLL_REFCLK_SRC),
> +	     CMN_PLL_REFCLK_SRC_FROM_MASK,
> +	     CMN_PLL_REFCLK_SRC_FROM_REG);
> +	rmwl((cmn_base + CMN_PLL_REFCLK),
> +	     (CMN_PLL_REFCLK_EXTERNAL | CMN_PLL_REFCLK_FREQ_MASK
> +	      | CMN_PLL_REFCLK_DIV_MASK),
> +	     (CMN_PLL_REFCLK_FREQ_48M | CMN_PLL_REFCLK_DIV(2)));
> +
> +	rmwl((cmn_base + CMN_PLL_CTRL), CMN_PLL_CTRL_RST_N, 0);
> +	msleep(1);
> +	rmwl((cmn_base + CMN_PLL_CTRL), CMN_PLL_CTRL_RST_N,
> +	     CMN_PLL_CTRL_RST_N);
> +	msleep(1);
> +
> +	return read_poll_timeout(readl, val,
> +				 (val & CMN_PLL_STATUS_LOCKED),
> +				 100, 200000, false,
> +				 (cmn_base + CMN_PLL_STATUS));
> +}
> +

Hi Andrew,

Sorry to bother you. But I can't make a decision here.

The CMN block (Seem like the Abbreviation of "component") controls the 
entire network block. It need to be configured before uniphy, mdio, 
gmac, etc.. In the past, Qualcomm put it in mdio driver. But UNIPHY need 
to been initializated before mdio because some PHYs/switchs use the 
outclk provided by UNIPHY as their main clocks.

So it seem like that it should be described in a separate node. But I 
couldn't find a suitable driver directory for it. Can you please give me 
some suggestions? Thanks.