linux-kernel - Re: [RFC PATCH net-next 02/12] net: phy: mchp: Add support for LAN8804 PHY

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Message-ID: <YUhbs4P9jHKBYpYK@piout.net>
Date:   Mon, 20 Sep 2021 12:00:19 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        andrew@...n.ch, linux@...linux.org.uk, f.fainelli@...il.com,
        vladimir.oltean@....com, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH net-next 02/12] net: phy: mchp: Add support for
 LAN8804 PHY

Hi,

On 20/09/2021 11:52:08+0200, Horatiu Vultur wrote:
> The LAN8804 SKY has same features as that of LAN8804 SKY except that it

On of those part name should be different ;)

> doesn't support 1588, SyncE or Q-USGMII.
> 
> This PHY is found inside the LAN966X switches.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
>  drivers/net/phy/micrel.c   | 73 ++++++++++++++++++++++++++++++++++++++
>  include/linux/micrel_phy.h |  1 +
>  2 files changed, 74 insertions(+)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 5c928f827173..34800b547004 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -1537,6 +1537,65 @@ static int ksz886x_cable_test_get_status(struct phy_device *phydev,
>  	return ret;
>  }
>  
> +#define LAN_EXT_PAGE_ACCESS_CONTROL			0x16
> +#define LAN_EXT_PAGE_ACCESS_ADDRESS_DATA		0x17
> +#define LAN_EXT_PAGE_ACCESS_CTRL_EP_FUNC		0x4000
> +
> +#define LAN8804_ALIGN_SWAP				0x4a
> +#define LAN8804_ALIGN_TX_A_B_SWAP			0x1
> +#define LAN8804_ALIGN_TX_A_B_SWAP_MASK			GENMASK(2, 0)
> +#define LAN8814_CLOCK_MANAGEMENT			0xd
> +#define LAN8814_LINK_QUALITY				0x8e
> +
> +static int lanphy_read_page_reg(struct phy_device *phydev, int page, u32 addr)
> +{
> +	u32 data;
> +
> +	phy_write(phydev, LAN_EXT_PAGE_ACCESS_CONTROL, page);
> +	phy_write(phydev, LAN_EXT_PAGE_ACCESS_ADDRESS_DATA, addr);
> +	phy_write(phydev, LAN_EXT_PAGE_ACCESS_CONTROL,
> +		  (page | LAN_EXT_PAGE_ACCESS_CTRL_EP_FUNC));
> +	data = phy_read(phydev, LAN_EXT_PAGE_ACCESS_ADDRESS_DATA);
> +
> +	return data;
> +}
> +
> +static int lanphy_write_page_reg(struct phy_device *phydev, int page, u16 addr,
> +				 u16 val)
> +{
> +	phy_write(phydev, LAN_EXT_PAGE_ACCESS_CONTROL, page);
> +	phy_write(phydev, LAN_EXT_PAGE_ACCESS_ADDRESS_DATA, addr);
> +	phy_write(phydev, LAN_EXT_PAGE_ACCESS_CONTROL,
> +		  (page | LAN_EXT_PAGE_ACCESS_CTRL_EP_FUNC));
> +
> +	val = phy_write(phydev, LAN_EXT_PAGE_ACCESS_ADDRESS_DATA, val);
> +	if (val) {
> +		phydev_err(phydev, "Error: phy_write has returned error %d\n",
> +			   val);
> +		return val;
> +	}
> +	return 0;
> +}
> +
> +static int lan8804_config_init(struct phy_device *phydev)
> +{
> +	int val;
> +
> +	/* MDI-X setting for swap A,B transmit */
> +	val = lanphy_read_page_reg(phydev, 2, LAN8804_ALIGN_SWAP);
> +	val &= ~LAN8804_ALIGN_TX_A_B_SWAP_MASK;
> +	val |= LAN8804_ALIGN_TX_A_B_SWAP;
> +	lanphy_write_page_reg(phydev, 2, LAN8804_ALIGN_SWAP, val);
> +
> +	/* Make sure that the PHY will not stop generating the clock when the
> +	 * link partner goes down
> +	 */
> +	lanphy_write_page_reg(phydev, 31, LAN8814_CLOCK_MANAGEMENT, 0x27e);
> +	lanphy_read_page_reg(phydev, 1, LAN8814_LINK_QUALITY);
> +
> +	return 0;
> +}
> +
>  static struct phy_driver ksphy_driver[] = {
>  {
>  	.phy_id		= PHY_ID_KS8737,
> @@ -1718,6 +1777,20 @@ static struct phy_driver ksphy_driver[] = {
>  	.get_stats	= kszphy_get_stats,
>  	.suspend	= genphy_suspend,
>  	.resume		= kszphy_resume,
> +}, {
> +	.phy_id		= PHY_ID_LAN8804,
> +	.phy_id_mask	= MICREL_PHY_ID_MASK,
> +	.name		= "Microchip LAN966X Gigabit PHY",
> +	.config_init	= lan8804_config_init,
> +	.driver_data	= &ksz9021_type,
> +	.probe		= kszphy_probe,
> +	.soft_reset	= genphy_soft_reset,
> +	.read_status	= ksz9031_read_status,
> +	.get_sset_count	= kszphy_get_sset_count,
> +	.get_strings	= kszphy_get_strings,
> +	.get_stats	= kszphy_get_stats,
> +	.suspend	= genphy_suspend,
> +	.resume		= kszphy_resume,
>  }, {
>  	.phy_id		= PHY_ID_KSZ9131,
>  	.phy_id_mask	= MICREL_PHY_ID_MASK,
> diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
> index 3d43c60b49fa..1f7c33b2f5a3 100644
> --- a/include/linux/micrel_phy.h
> +++ b/include/linux/micrel_phy.h
> @@ -28,6 +28,7 @@
>  #define PHY_ID_KSZ9031		0x00221620
>  #define PHY_ID_KSZ9131		0x00221640
>  #define PHY_ID_LAN8814		0x00221660
> +#define PHY_ID_LAN8804		0x00221670
>  
>  #define PHY_ID_KSZ886X		0x00221430
>  #define PHY_ID_KSZ8863		0x00221435
> -- 
> 2.31.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com