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Date: Wed, 1 Feb 2017 14:55:55 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
f.fainelli@...il.com, Allan.Nielsen@...rosemi.com
Subject: Re: [PATCH v2 net-next] net: phy: Add LED mode driver for Microsemi
PHYs.
On Wed, Feb 01, 2017 at 06:23:46PM +0530, Raju Lakkaraju wrote:
> From: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
>
> LED Mode:
> Microsemi PHY support 2 LEDs (LED[0] and LED[1]) to display different
> status information that can be selected by setting LED mode.
>
> LED Mode parameter (vsc8531, led-0-mode) and (vsc8531, led-1-mode) get
> from Device Tree.
>
> Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
> ---
> .../devicetree/bindings/net/mscc-phy-vsc8531.txt | 10 +++
> drivers/net/phy/mscc.c | 85 +++++++++++++++++++++-
> include/dt-bindings/net/mscc-phy-vsc8531.h | 29 ++++++++
> 3 files changed, 123 insertions(+), 1 deletion(-)
> create mode 100644 include/dt-bindings/net/mscc-phy-vsc8531.h
>
> diff --git a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> index bdefefc6..bb7450c 100644
> --- a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> +++ b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> @@ -27,6 +27,14 @@ Optional properties:
> 'vddmac'.
> Default value is 0%.
> Ref: Table:1 - Edge rate change (below).
> +- vsc8531,led-0-mode : LED mode. Specify how the LED[0] should behave.
> + Allowed values are define in
> + "include/dt-bindings/net/mscc-phy-vsc8531.h".
> + Default value is 1.
1 is not very useful. What does it mean? How about:
Default value is LINK_1000_ACTIVITY (1)
> +- vsc8531,led-1-mode : LED mode. Specify how the LED[1] should behave.
> + Allowed values are define in
> + "include/dt-bindings/net/mscc-phy-vsc8531.h".
> + Default value is 2.
>
> Table: 1 - Edge rate change
> ----------------------------------------------------------------|
> @@ -60,4 +68,6 @@ Example:
> compatible = "ethernet-phy-id0007.0570";
> vsc8531,vddmac = <3300>;
> vsc8531,edge-slowdown = <7>;
> + vsc8531,led-0-mode = <LINK_1000_ACTIVITY>;
> + vsc8531,led-1-mode = <LINK_100_ACTIVITY>;
> };
> diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
> index e03ead8..f0cb7cc 100644
> --- a/drivers/net/phy/mscc.c
> +++ b/drivers/net/phy/mscc.c
> @@ -13,6 +13,7 @@
> #include <linux/phy.h>
> #include <linux/of.h>
> #include <linux/netdevice.h>
> +#include <dt-bindings/net/mscc-phy-vsc8531.h>
>
> enum rgmii_rx_clock_delay {
> RGMII_RX_CLK_DELAY_0_2_NS = 0,
> @@ -52,6 +53,11 @@ enum rgmii_rx_clock_delay {
> #define MSCC_PHY_DEV_AUX_CNTL 28
> #define HP_AUTO_MDIX_X_OVER_IND_MASK 0x2000
>
> +#define MSCC_PHY_LED_MODE_SEL 29
> +#define LED_1_MODE_SEL_MASK 0x00F0
> +#define LED_0_MODE_SEL_MASK 0x000F
> +#define LED_1_MODE_SEL_POS 4
> +
> #define MSCC_EXT_PAGE_ACCESS 31
> #define MSCC_PHY_PAGE_STANDARD 0x0000 /* Standard registers */
> #define MSCC_PHY_PAGE_EXTENDED 0x0001 /* Extended registers */
> @@ -99,6 +105,8 @@ enum rgmii_rx_clock_delay {
>
> struct vsc8531_private {
> int rate_magic;
> + u8 led_0_mode;
> + u8 led_1_mode;
> };
>
> #ifdef CONFIG_OF_MDIO
> @@ -123,6 +131,29 @@ static int vsc85xx_phy_page_set(struct phy_device *phydev, u8 page)
> return rc;
> }
>
> +static int vsc85xx_led_cntl_set(struct phy_device *phydev,
> + u8 led_num,
> + u8 mode)
> +{
> + int rc;
> + u16 reg_val;
> +
> + mutex_lock(&phydev->lock);
> + reg_val = phy_read(phydev, MSCC_PHY_LED_MODE_SEL);
> + if (led_num) {
> + reg_val &= ~LED_1_MODE_SEL_MASK;
> + reg_val |= (((u16)mode << LED_1_MODE_SEL_POS) &
> + LED_1_MODE_SEL_MASK);
> + } else {
> + reg_val &= ~LED_0_MODE_SEL_MASK;
> + reg_val |= ((u16)mode & LED_0_MODE_SEL_MASK);
> + }
> + rc = phy_write(phydev, MSCC_PHY_LED_MODE_SEL, reg_val);
> + mutex_unlock(&phydev->lock);
> +
> + return rc;
> +}
> +
> static int vsc85xx_mdix_get(struct phy_device *phydev, u8 *mdix)
> {
> u16 reg_val;
> @@ -370,11 +401,43 @@ static int vsc85xx_edge_rate_magic_get(struct phy_device *phydev)
>
> return -EINVAL;
> }
> +
> +static int vsc85xx_dt_led_mode_get(struct phy_device *phydev,
> + char *led,
> + u8 default_mode)
> +{
> + struct device *dev = &phydev->mdio.dev;
> + struct device_node *of_node = dev->of_node;
> + u8 led_mode;
> + int rc;
> +
> + if (!of_node)
> + return -ENODEV;
> +
> + rc = of_property_read_u8(of_node, led, &led_mode);
> + if ((rc == 0) &&
> + ((led_mode > 15) || (led_mode == 7) || (led_mode == 11))) {
> + phydev_err(phydev, "DT %s invalid\n", led);
> + return -EINVAL;
> + } else if (rc == -EINVAL) {
> + return default_mode;
> + }
I don't think you understood my comment about of_property_read_u8()
not modifying &led_mode on error. Please read the comment again, and
simplify this.
> +
> + return led_mode;
> +}
> +
> #else
> static int vsc85xx_edge_rate_magic_get(struct phy_device *phydev)
> {
> return 0;
> }
> +
> +static int vsc85xx_dt_led_mode_get(struct phy_device *phydev,
> + char *led,
> + u8 default_mode)
> +{
> + return default_mode;
> +}
> #endif /* CONFIG_OF_MDIO */
>
> static int vsc85xx_edge_rate_cntl_set(struct phy_device *phydev, u8 edge_rate)
> @@ -499,6 +562,13 @@ static int vsc85xx_config_init(struct phy_device *phydev)
> if (rc)
> return rc;
>
> + rc = vsc85xx_led_cntl_set(phydev, 1, vsc8531->led_1_mode);
> + if (rc)
> + return rc;
Blank line please.
> + rc = vsc85xx_led_cntl_set(phydev, 0, vsc8531->led_0_mode);
> + if (rc)
> + return rc;
> +
> rc = genphy_config_init(phydev);
>
> return rc;
> @@ -555,8 +625,9 @@ static int vsc85xx_read_status(struct phy_device *phydev)
>
> static int vsc85xx_probe(struct phy_device *phydev)
> {
> - int rate_magic;
> struct vsc8531_private *vsc8531;
> + int rate_magic;
> + int led_mode;
>
> rate_magic = vsc85xx_edge_rate_magic_get(phydev);
> if (rate_magic < 0)
> @@ -570,6 +641,18 @@ static int vsc85xx_probe(struct phy_device *phydev)
>
> vsc8531->rate_magic = rate_magic;
>
> + /* LED[0] and LED[1] mode */
> + led_mode = vsc85xx_dt_led_mode_get(phydev, "vsc8531,led-0-mode",
> + LINK_1000_ACTIVITY);
> + if (led_mode < 0)
> + return led_mode;
> + vsc8531->led_0_mode = led_mode;
Blank line.
> + led_mode = vsc85xx_dt_led_mode_get(phydev, "vsc8531,led-1-mode",
> + LINK_100_ACTIVITY);
> + if (led_mode < 0)
> + return led_mode;
> + vsc8531->led_1_mode = led_mode;
> +
> return 0;
> }
>
> diff --git a/include/dt-bindings/net/mscc-phy-vsc8531.h b/include/dt-bindings/net/mscc-phy-vsc8531.h
> new file mode 100644
> index 0000000..af6af98
> --- /dev/null
> +++ b/include/dt-bindings/net/mscc-phy-vsc8531.h
> @@ -0,0 +1,29 @@
> +/*
> + * Device Tree constants for Microsemi VSC8531 PHY
> + *
> + * Author: Nagaraju Lakkaraju
> + *
> + * License: Dual MIT/GPL
> + * Copyright (c) 2017 Microsemi Corporation
> + */
> +
> +#ifndef _DT_BINDINGS_MSCC_VSC8531_H
> +#define _DT_BINDINGS_MSCC_VSC8531_H
> +
> +/* PHY LED Modes */
> +#define LINK_ACTIVITY 0
> +#define LINK_1000_ACTIVITY 1
> +#define LINK_100_ACTIVITY 2
> +#define LINK_10_ACTIVITY 3
> +#define LINK_100_1000_ACTIVITY 4
> +#define LINK_10_1000_ACTIVITY 5
> +#define LINK_10_100_ACTIVITY 6
> +#define DUPLEX_COLLISION 8
> +#define COLLISION 9
> +#define ACTIVITY 10
> +#define AUTONEG_FAULT 12
> +#define SERIAL_MODE 13
> +#define FORCE_LED_OFF 14
> +#define FORCE_LED_ON 15
You should prefix these with VSC8531_. Otherwise there is potential to
have issues with two different PHYs defining some of these frequently
used macros.
Andrew
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