Subject: Re: [PATCH net-next 2/3] net: stmmac: dwmac-oxnas: Add support for
 OX810SE
To:     davem@davemloft.net
Cc:     netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-oxnas@groups.io, linux-kernel@vger.kernel.org
References: <20220103175638.89625-1-narmstrong@baylibre.com>
 <20220103175638.89625-3-narmstrong@baylibre.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
Organization: Baylibre
Message-ID: <4a0ea0f1-9cc5-a242-75af-ed4bd0537b16@baylibre.com>
Date:   Tue, 4 Jan 2022 09:42:21 +0100
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On 03/01/2022 18:56, Neil Armstrong wrote:
> Add support for OX810SE dwmac glue setup, which is a simplified version
> of the OX820 introduced later with more control on the PHY interface.
> 
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> ---
>  .../net/ethernet/stmicro/stmmac/dwmac-oxnas.c | 92 ++++++++++++++-----
>  1 file changed, 70 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
> index adfeb8d3293d..7ffa4a4eb30f 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
> @@ -12,6 +12,7 @@
>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/mfd/syscon.h>
> @@ -48,12 +49,58 @@
>  #define DWMAC_RX_VARDELAY(d)		((d) << DWMAC_RX_VARDELAY_SHIFT)
>  #define DWMAC_RXN_VARDELAY(d)		((d) << DWMAC_RXN_VARDELAY_SHIFT)
>  
> +struct oxnas_dwmac;
> +
> +struct oxnas_dwmac_data {
> +	void (*setup)(struct oxnas_dwmac *dwmac);
> +};
> +
>  struct oxnas_dwmac {
>  	struct device	*dev;
>  	struct clk	*clk;
>  	struct regmap	*regmap;
> +	const struct oxnas_dwmac_data	*data;
>  };
>  
> +static void oxnas_dwmac_setup_ox810se(struct oxnas_dwmac *dwmac)
> +{
> +	unsigned int value;
> +
> +	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
> +	value = BIT(DWMAC_CKEN_GTX)		|
> +		 /* Use simple mux for 25/125 Mhz clock switching */
> +		 BIT(DWMAC_SIMPLE_MUX);
> +
> +	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
> +}
> +
> +static void oxnas_dwmac_setup_ox820(struct oxnas_dwmac *dwmac)
> +{
> +	unsigned int value;
> +
> +	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
> +	value = BIT(DWMAC_CKEN_GTX)		|
> +		 /* Use simple mux for 25/125 Mhz clock switching */
> +		BIT(DWMAC_SIMPLE_MUX)		|
> +		/* set auto switch tx clock source */
> +		BIT(DWMAC_AUTO_TX_SOURCE)	|
> +		/* enable tx & rx vardelay */
> +		BIT(DWMAC_CKEN_TX_OUT)		|
> +		BIT(DWMAC_CKEN_TXN_OUT)	|
> +		BIT(DWMAC_CKEN_TX_IN)		|
> +		BIT(DWMAC_CKEN_RX_OUT)		|
> +		BIT(DWMAC_CKEN_RXN_OUT)	|
> +		BIT(DWMAC_CKEN_RX_IN);
> +	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
> +
> +	/* set tx & rx vardelay */
> +	value = DWMAC_TX_VARDELAY(4)	|
> +		DWMAC_TXN_VARDELAY(2)	|
> +		DWMAC_RX_VARDELAY(10)	|
> +		DWMAC_RXN_VARDELAY(8);
> +	regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
> +}
> +
>  static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
>  {
>  	struct oxnas_dwmac *dwmac = priv;
> @@ -75,27 +122,7 @@ static int oxnas_dwmac_init(struct platform_device *pdev, void *priv)
>  		return ret;
>  	}

There's an issue with the patch, the value read from register is not used, I'll send a V2 with the fix.

Neil

>  
> -	/* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
> -	value |= BIT(DWMAC_CKEN_GTX)		|
> -		 /* Use simple mux for 25/125 Mhz clock switching */
> -		 BIT(DWMAC_SIMPLE_MUX)		|
> -		 /* set auto switch tx clock source */
> -		 BIT(DWMAC_AUTO_TX_SOURCE)	|
> -		 /* enable tx & rx vardelay */
> -		 BIT(DWMAC_CKEN_TX_OUT)		|
> -		 BIT(DWMAC_CKEN_TXN_OUT)	|
> -		 BIT(DWMAC_CKEN_TX_IN)		|
> -		 BIT(DWMAC_CKEN_RX_OUT)		|
> -		 BIT(DWMAC_CKEN_RXN_OUT)	|
> -		 BIT(DWMAC_CKEN_RX_IN);
> -	regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
> -
> -	/* set tx & rx vardelay */
> -	value = DWMAC_TX_VARDELAY(4)	|
> -		DWMAC_TXN_VARDELAY(2)	|
> -		DWMAC_RX_VARDELAY(10)	|
> -		DWMAC_RXN_VARDELAY(8);
> -	regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
> +	dwmac->data->setup(dwmac);
>  
>  	return 0;
>  }
> @@ -128,6 +155,12 @@ static int oxnas_dwmac_probe(struct platform_device *pdev)
>  		goto err_remove_config_dt;
>  	}
>  
> +	dwmac->data = (const struct oxnas_dwmac_data *)of_device_get_match_data(&pdev->dev);
> +	if (!dwmac->data) {
> +		ret = -EINVAL;
> +		goto err_remove_config_dt;
> +	}
> +
>  	dwmac->dev = &pdev->dev;
>  	plat_dat->bsp_priv = dwmac;
>  	plat_dat->init = oxnas_dwmac_init;
> @@ -166,8 +199,23 @@ static int oxnas_dwmac_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> +static const struct oxnas_dwmac_data ox810se_dwmac_data = {
> +	.setup = oxnas_dwmac_setup_ox810se,
> +};
> +
> +static const struct oxnas_dwmac_data ox820_dwmac_data = {
> +	.setup = oxnas_dwmac_setup_ox820,
> +};
> +
>  static const struct of_device_id oxnas_dwmac_match[] = {
> -	{ .compatible = "oxsemi,ox820-dwmac" },
> +	{
> +		.compatible = "oxsemi,ox810se-dwmac",
> +		.data = &ox810se_dwmac_data,
> +	},
> +	{
> +		.compatible = "oxsemi,ox820-dwmac",
> +		.data = &ox820_dwmac_data,
> +	},
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, oxnas_dwmac_match);
>