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Date: Wed, 7 May 2014 10:31:45 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Hubert Chaumette <hchaumette@...neo-embedded.com>
Cc: netdev <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Randy Dunlap <rdunlap@...radead.org>, xobs@...agi.com,
David Miller <davem@...emloft.net>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] ARM: i.MX6: Add OF configuration support for ksz9031
2014-05-06 0:40 GMT-07:00 Hubert Chaumette <hchaumette@...neo-embedded.com>:
> Adds support for ksz9031 PAD skew configuration over devicetree.
>
> Signed-off-by: Hubert Chaumette <hchaumette@...neo-embedded.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> drivers/net/phy/micrel.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 105 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index d849684..bc7c7d2 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -283,6 +283,110 @@ static int ksz9021_config_init(struct phy_device *phydev)
> return 0;
> }
>
> +#define MII_KSZ9031RN_MMD_CTRL_REG 0x0d
> +#define MII_KSZ9031RN_MMD_REGDATA_REG 0x0e
> +#define OP_DATA 1
> +#define KSZ9031_PS_TO_REG 60
> +
> +/* Extended registers */
> +#define MII_KSZ9031RN_CONTROL_PAD_SKEW 4
> +#define MII_KSZ9031RN_RX_DATA_PAD_SKEW 5
> +#define MII_KSZ9031RN_TX_DATA_PAD_SKEW 6
> +#define MII_KSZ9031RN_CLK_PAD_SKEW 8
> +
> +static int ksz9031_extended_write(struct phy_device *phydev,
> + u8 mode, u32 dev_addr, u32 regnum, u16 val)
> +{
> + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, dev_addr);
> + phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, regnum);
> + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, (mode << 14) | dev_addr);
> + return phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, val);
> +}
> +
> +static int ksz9031_extended_read(struct phy_device *phydev,
> + u8 mode, u32 dev_addr, u32 regnum)
> +{
> + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, dev_addr);
> + phy_write(phydev, MII_KSZ9031RN_MMD_REGDATA_REG, regnum);
> + phy_write(phydev, MII_KSZ9031RN_MMD_CTRL_REG, (mode << 14) | dev_addr);
> + return phy_read(phydev, MII_KSZ9031RN_MMD_REGDATA_REG);
> +}
> +
> +static int ksz9031_of_load_skew_values(struct phy_device *phydev,
> + struct device_node *of_node,
> + u16 reg, size_t field_sz,
> + char *field[], u8 numfields)
> +{
> + int val[4] = {-1, -2, -3, -4};
> + int matches = 0;
> + u16 mask;
> + u16 maxval;
> + u16 newval;
> + int i;
> +
> + for (i = 0; i < numfields; i++)
> + if (!of_property_read_u32(of_node, field[i], val + i))
> + matches++;
> +
> + if (!matches)
> + return 0;
> +
> + if (matches < numfields)
> + newval = ksz9031_extended_read(phydev, OP_DATA, 2, reg);
> + else
> + newval = 0;
> +
> + maxval = (field_sz == 4) ? 0xf : 0x1f;
> + for (i = 0; i < numfields; i++)
> + if (val[i] != -(i + 1)) {
> + mask = 0xffff;
> + mask ^= maxval << (field_sz * i);
> + newval = (newval & mask) |
> + (((val[i] / KSZ9031_PS_TO_REG) & maxval)
> + << (field_sz * i));
> + }
> +
> + return ksz9031_extended_write(phydev, OP_DATA, 2, reg, newval);
> +}
> +
> +static int ksz9031_config_init(struct phy_device *phydev)
> +{
> + struct device *dev = &phydev->dev;
> + struct device_node *of_node = dev->of_node;
> + char *clk_skews[2] = {"rxc-skew-ps", "txc-skew-ps"};
> + char *rx_data_skews[4] = {
> + "rxd0-skew-ps", "rxd1-skew-ps",
> + "rxd2-skew-ps", "rxd3-skew-ps"
> + };
> + char *tx_data_skews[4] = {
> + "txd0-skew-ps", "txd1-skew-ps",
> + "txd2-skew-ps", "txd3-skew-ps"
> + };
> + char *control_skews[2] = {"txen-skew-ps", "rxdv-skew-ps"};
> +
> + if (!of_node && dev->parent->of_node)
> + of_node = dev->parent->of_node;
> +
> + if (of_node) {
> + ksz9031_of_load_skew_values(phydev, of_node,
> + MII_KSZ9031RN_CLK_PAD_SKEW, 5,
> + clk_skews, 2);
> +
> + ksz9031_of_load_skew_values(phydev, of_node,
> + MII_KSZ9031RN_CONTROL_PAD_SKEW, 4,
> + control_skews, 2);
> +
> + ksz9031_of_load_skew_values(phydev, of_node,
> + MII_KSZ9031RN_RX_DATA_PAD_SKEW, 4,
> + rx_data_skews, 4);
> +
> + ksz9031_of_load_skew_values(phydev, of_node,
> + MII_KSZ9031RN_TX_DATA_PAD_SKEW, 4,
> + tx_data_skews, 4);
> + }
> + return 0;
> +}
> +
> #define KSZ8873MLL_GLOBAL_CONTROL_4 0x06
> #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX (1 << 6)
> #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED (1 << 4)
> @@ -469,7 +573,7 @@ static struct phy_driver ksphy_driver[] = {
> .features = (PHY_GBIT_FEATURES | SUPPORTED_Pause
> | SUPPORTED_Asym_Pause),
> .flags = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
> - .config_init = kszphy_config_init,
> + .config_init = ksz9031_config_init,
> .config_aneg = genphy_config_aneg,
> .read_status = genphy_read_status,
> .ack_interrupt = kszphy_ack_interrupt,
> --
> 2.0.0.rc0
>
--
Florian
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