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Date: Wed, 1 Feb 2017 15:02:18 +0530
From: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
To: Andrew Lunn <andrew@...n.ch>
CC: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
<f.fainelli@...il.com>, <Allan.Nielsen@...rosemi.com>
Subject: Re: [PATCH net-next] net: phy: Add LED mode driver for Microsemi
PHYs.
Hi Andrew,
Thank you for review and valuable comments.
On Tue, Jan 31, 2017 at 02:30:09PM +0100, Andrew Lunn wrote:
> EXTERNAL EMAIL
>
>
> On Tue, Jan 31, 2017 at 11:16:01AM +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 (vddmac, led-0-mode) and (vddmac, led-1-mode) get
> > from Device Tree.
>
> Hi Raju
>
> How is vddmac an LED mode parameter?
>
Typo. I will correct.
It should be "vsc8531, led-0-mode".
> > Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
> > ---
> > .../devicetree/bindings/net/mscc-phy-vsc8531.txt | 39 ++++++++++++
> > drivers/net/phy/mscc.c | 72 ++++++++++++++++++++++
> > 2 files changed, 111 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> > index bdefefc6..1abf4b6 100644
> > --- a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> > +++ b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
> > @@ -27,6 +27,12 @@ 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 is listed in the 'PHY LED Mode' -
> > + Table 2 (below). Default value is 1.
> > +- vsc8531,led-1-mode : LED mode. Specify how the LED[1] should behave.
> > + Allowed values is listed in the 'PHY LED Mode' -
> > + Table 2 (below). Default value is 2.
> >
> > Table: 1 - Edge rate change
> > ----------------------------------------------------------------|
> > @@ -54,10 +60,43 @@ Table: 1 - Edge rate change
> > | (slowest) |
> > |---------------------------------------------------------------|
> >
> > +Table: 2 - PHY LED Mode
> > +|-----------------------------------------------|
> > +| LINK_ACTIVITY | 0 |
> > +|-----------------------------------------------|
> > +| LINK_1000_ACTIVITY | 1 |
> > +|-----------------------------------------------|
> > +| LINK_100_ACTIVITY | 2 |
> > +|-----------------------------------------------|
> > +| LINK_10_ACTIVITY | 3 |
> > +|-----------------------------------------------|
> > +| LINK_100_1000_ACTIVITY | 4 |
> > +|-----------------------------------------------|
> > +| LINK_10_1000_ACTIVITY | 5 |
> > +|-----------------------------------------------|
> > +| LINK_10_100_ACTIVITY | 6 |
> > +|-----------------------------------------------|
> > +| DUPLEX_COLLISION | 8 |
> > +|-----------------------------------------------|
> > +| COLLISION | 9 |
> > +|-----------------------------------------------|
> > +| ACTIVITY | 10 |
> > +|-----------------------------------------------|
> > +| AUTONEG_FAULT | 12 |
> > +|-----------------------------------------------|
> > +| SERIAL_MODE | 13 |
> > +|-----------------------------------------------|
> > +| FORCE_LED_OFF | 14 |
> > +|-----------------------------------------------|
> > +| FORCE_LED_ON | 15 |
> > +|-----------------------------------------------|
> > +
> > Example:
> >
> > vsc8531_0: ethernet-phy@0 {
> > compatible = "ethernet-phy-id0007.0570";
> > vsc8531,vddmac = <3300>;
> > vsc8531,edge-slowdown = <7>;
> > + vsc8531,led-0-mode = <1>;
> > + vsc8531,led-1-mode = <2>;
>
> Numbers like this are pretty unreadable. I would suggest adding a header file in
> include/dt-bindings/net/
>
Accpeted. I will create new header file for DT Macros.
> > +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 |= ((u16)mode & LED_0_MODE_SEL_MASK);
> > + }
>
> The asymmetry here makes me think this is wrong.
>
Yes. You are correct.
I missed following line in else part:
"reg_val &= ~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;
> > @@ -499,6 +547,13 @@ 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;
> > + rc = vsc85xx_led_cntl_set(phydev, 0, vsc8531->led_0_mode);
> > + if (rc)
> > + return rc;
> > +
> > rc = genphy_config_init(phydev);
> >
> > return rc;
> > @@ -555,8 +610,13 @@ static int vsc85xx_read_status(struct phy_device *phydev)
> >
> > static int vsc85xx_probe(struct phy_device *phydev)
> > {
> > + int rc;
> > int rate_magic;
> > + u8 led_0_mode;
> > + u8 led_1_mode;
> > struct vsc8531_private *vsc8531;
> > + struct device *dev = &phydev->mdio.dev;
> > + struct device_node *of_node = dev->of_node;
>
> declarations are supposed to be reverse Christmas tree. i.e. longest
> lines first.
>
Accpeted.
> >
> > rate_magic = vsc85xx_edge_rate_magic_get(phydev);
> > if (rate_magic < 0)
> > @@ -570,6 +630,18 @@ static int vsc85xx_probe(struct phy_device *phydev)
> >
> > vsc8531->rate_magic = rate_magic;
> >
> > + /* LED[0] and LED[1] mode */
> > + rc = of_property_read_u8(of_node, "vsc8531,led-0-mode", &led_0_mode);
> > + if (rc != 0)
>
> Please simplify this to just if (rc). Actually, it can be even
> simpler. of_property_read_u8 guarantees not to modify the return
> value unless it has a value to return. So
>
> vsc8531->led_0_mode = LINK_1000_ACTIVITY;
> err = of_property_read_u8(of_node, "vsc8531,led-0-mode", &led_0_mode);
> if (err != EINVAL)
> return err;
>
> vsc8531->led_1_mode = LINK_100_ACTIVITY;
> err = of_property_read_u8(of_node, "vsc8531,led-1-mode", &led_1_mode);
> if (err != EINVAL)
> return err;
>
> What about range checking? I could put 42 in the device tree for led
> 0, and it would set led 1 as well i think?
>
Accpeted. I will add range check and error condition.
If DT don't have LED parameters define, driver should program with default values.
> Andrew
---
Thanks,
Raju.
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