netdev - Re: [PATCH] phy: nxp-c45: add driver for tja1103

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Date:   Mon, 12 Apr 2021 10:50:14 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: nxp-c45: add driver for tja1103

On Fri, Apr 09, 2021 at 09:41:06PM +0300, Radu Pirea (NXP OSS) wrote:
> +#define B100T1_PMAPMD_CTL		0x0834
> +#define B100T1_PMAPMD_CONFIG_EN		BIT(15)
> +#define B100T1_PMAPMD_MASTER		BIT(14)
> +#define MASTER_MODE			(B100T1_PMAPMD_CONFIG_EN | B100T1_PMAPMD_MASTER)
> +#define SLAVE_MODE			(B100T1_PMAPMD_CONFIG_EN)
> +
> +#define DEVICE_CONTROL			0x0040
> +#define DEVICE_CONTROL_RESET		BIT(15)
> +#define DEVICE_CONTROL_CONFIG_GLOBAL_EN	BIT(14)
> +#define DEVICE_CONTROL_CONFIG_ALL_EN	BIT(13)
> +#define RESET_POLL_NS			(250 * NSEC_PER_MSEC)
> +
> +#define PHY_CONTROL			0x8100
> +#define PHY_CONFIG_EN			BIT(14)
> +#define PHY_START_OP			BIT(0)
> +
> +#define PHY_CONFIG			0x8108
> +#define PHY_CONFIG_AUTO			BIT(0)
> +
> +#define SIGNAL_QUALITY			0x8320
> +#define SQI_VALID			BIT(14)
> +#define SQI_MASK			GENMASK(2, 0)
> +#define MAX_SQI				SQI_MASK
> +
> +#define CABLE_TEST			0x8330
> +#define CABLE_TEST_ENABLE		BIT(15)
> +#define CABLE_TEST_START		BIT(14)
> +#define CABLE_TEST_VALID		BIT(13)
> +#define CABLE_TEST_OK			0x00
> +#define CABLE_TEST_SHORTED		0x01
> +#define CABLE_TEST_OPEN			0x02
> +#define CABLE_TEST_UNKNOWN		0x07
> +
> +#define PORT_CONTROL			0x8040
> +#define PORT_CONTROL_EN			BIT(14)
> +
> +#define PORT_INFRA_CONTROL		0xAC00
> +#define PORT_INFRA_CONTROL_EN		BIT(14)
> +
> +#define VND1_RXID			0xAFCC
> +#define VND1_TXID			0xAFCD
> +#define ID_ENABLE			BIT(15)
> +
> +#define ABILITIES			0xAFC4
> +#define RGMII_ID_ABILITY		BIT(15)
> +#define RGMII_ABILITY			BIT(14)
> +#define RMII_ABILITY			BIT(10)
> +#define REVMII_ABILITY			BIT(9)
> +#define MII_ABILITY			BIT(8)
> +#define SGMII_ABILITY			BIT(0)
> +
> +#define MII_BASIC_CONFIG		0xAFC6
> +#define MII_BASIC_CONFIG_REV		BIT(8)
> +#define MII_BASIC_CONFIG_SGMII		0x9
> +#define MII_BASIC_CONFIG_RGMII		0x7
> +#define MII_BASIC_CONFIG_RMII		0x5
> +#define MII_BASIC_CONFIG_MII		0x4
> +
> +#define SYMBOL_ERROR_COUNTER		0x8350
> +#define LINK_DROP_COUNTER		0x8352
> +#define LINK_LOSSES_AND_FAILURES	0x8353
> +#define R_GOOD_FRAME_CNT		0xA950
> +#define R_BAD_FRAME_CNT			0xA952
> +#define R_RXER_FRAME_CNT		0xA954
> +#define RX_PREAMBLE_COUNT		0xAFCE
> +#define TX_PREAMBLE_COUNT		0xAFCF
> +#define RX_IPG_LENGTH			0xAFD0
> +#define TX_IPG_LENGTH			0xAFD1
> +#define COUNTERS_EN			BIT(15)
> +
> +#define CLK_25MHZ_PS_PERIOD		40000UL
> +#define PS_PER_DEGREE			(CLK_25MHZ_PS_PERIOD / 360)
> +#define MIN_ID_PS			8222U
> +#define MAX_ID_PS			11300U

Maybe include some prefix as to which MMD each of these registers is
located?

> +static bool nxp_c45_can_sleep(struct phy_device *phydev)
> +{
> +	int reg;
> +
> +	reg = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT1);
> +	if (reg < 0)
> +		return false;
> +
> +	return !!(reg & MDIO_STAT1_LPOWERABLE);
> +}

This looks like it could be useful as a generic helper function -
nothing in this function is specific to this PHY.

> +static int nxp_c45_resume(struct phy_device *phydev)
> +{
> +	int reg;
> +
> +	if (!nxp_c45_can_sleep(phydev))
> +		return -EOPNOTSUPP;
> +
> +	reg = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
> +	reg &= ~MDIO_CTRL1_LPOWER;
> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, reg);
> +
> +	return 0;
> +}
> +
> +static int nxp_c45_suspend(struct phy_device *phydev)
> +{
> +	int reg;
> +
> +	if (!nxp_c45_can_sleep(phydev))
> +		return -EOPNOTSUPP;
> +
> +	reg = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
> +	reg |= MDIO_CTRL1_LPOWER;
> +	phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, reg);
> +
> +	return 0;
> +}

These too look like potential generic helper functions.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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