linux-kernel - Re: [net-next PATCH 07/13] net: dsa: qca8k: add support for mac6

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Date:   Sun, 10 Oct 2021 14:40:37 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthew Hagan <mnhagan88@...il.com>
Subject: Re: [net-next PATCH 07/13] net: dsa: qca8k: add support for
 mac6_exchange, sgmii falling edge

On Thu, Oct 07, 2021 at 12:35:57AM +0200, Ansuel Smith wrote:
> Some device set the switch to exchange the mac0 port with mac6 port. Add
> support for this in the qca8k driver. Also add support for SGMII rx/tx
> clock falling edge. This is only present for pad0, pad5 and pad6 have
> these bit reserved from Documentation.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> Signed-off-by: Matthew Hagan <mnhagan88@...il.com>
> ---
>  drivers/net/dsa/qca8k.c | 33 +++++++++++++++++++++++++++++++++
>  drivers/net/dsa/qca8k.h |  3 +++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index 5bce7ac4dea7..3a040a3ed58e 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -973,6 +973,34 @@ qca8k_setup_mac_pwr_sel(struct qca8k_priv *priv)
>  	return ret;
>  }
>  
> +static int
> +qca8k_setup_port0_pad_ctrl_reg(struct qca8k_priv *priv)
> +{
> +	struct device_node *node = priv->dev->of_node;
> +	u32 mask = 0;
> +	int ret = 0;
> +
> +	/* Swap MAC0-MAC6 */
> +	if (of_property_read_bool(node, "qca,mac6-exchange"))
> +		mask |= QCA8K_PORT0_PAD_CTRL_MAC06_EXCHG;
> +
> +	/* SGMII Clock phase configuration */
> +	if (of_property_read_bool(node, "qca,sgmii-rxclk-falling-edge"))
> +		mask |= QCA8K_PORT0_PAD_SGMII_RXCLK_FALLING_EDGE;
> +
> +	if (of_property_read_bool(node, "qca,sgmii-txclk-falling-edge"))
> +		mask |= QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE;
> +
> +	if (mask)
> +		ret = qca8k_rmw(priv, QCA8K_REG_PORT0_PAD_CTRL,
> +				QCA8K_PORT0_PAD_CTRL_MAC06_EXCHG |
> +				QCA8K_PORT0_PAD_SGMII_RXCLK_FALLING_EDGE |
> +				QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE,
> +				mask);
> +
> +	return ret;
> +}
> +
>  static int
>  qca8k_setup(struct dsa_switch *ds)
>  {
> @@ -1006,6 +1034,11 @@ qca8k_setup(struct dsa_switch *ds)
>  	if (ret)
>  		return ret;
>  
> +	/* Configure additional PORT0_PAD_CTRL properties */
> +	ret = qca8k_setup_port0_pad_ctrl_reg(priv);
> +	if (ret)
> +		return ret;
> +
>  	/* Enable CPU Port */
>  	ret = qca8k_reg_set(priv, QCA8K_REG_GLOBAL_FW_CTRL0,
>  			    QCA8K_GLOBAL_FW_CTRL0_CPU_PORT_EN);
> diff --git a/drivers/net/dsa/qca8k.h b/drivers/net/dsa/qca8k.h
> index fc7db94cc0c9..3fded69a6839 100644
> --- a/drivers/net/dsa/qca8k.h
> +++ b/drivers/net/dsa/qca8k.h
> @@ -35,6 +35,9 @@
>  #define   QCA8K_MASK_CTRL_DEVICE_ID_MASK		GENMASK(15, 8)
>  #define   QCA8K_MASK_CTRL_DEVICE_ID(x)			((x) >> 8)
>  #define QCA8K_REG_PORT0_PAD_CTRL			0x004
> +#define   QCA8K_PORT0_PAD_CTRL_MAC06_EXCHG		BIT(31)

Where can I find more information about this mac0/mac6 exchange? In this
document for ar8327, bit 31 of PORT0 PAD MODE CTRL is reserved.
http://www.datasheet.es/PDF/771154/AR8327-pdf.html

> +#define   QCA8K_PORT0_PAD_SGMII_RXCLK_FALLING_EDGE	BIT(19)
> +#define   QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE	BIT(18)
>  #define QCA8K_REG_PORT5_PAD_CTRL			0x008
>  #define QCA8K_REG_PORT6_PAD_CTRL			0x00c
>  #define   QCA8K_PORT_PAD_RGMII_EN			BIT(26)
> -- 
> 2.32.0
>