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Date: Fri, 7 Oct 2016 10:28:24 +0200
From: "Allan W. Nielsen" <allan.nielsen@...rosemi.com>
To: <netdev@...r.kernel.org>
CC: <andrew@...n.ch>, <f.fainelli@...il.com>,
<raju.lakkaraju@...rosemi.com>, <allan.nielsen@...rosemi.com>
Subject: [PATCH net-next v9 1/1] net: phy: Cleanup the Edge-Rate feature in Microsemi PHYs.
Edge-Rate cleanup include the following:
- Updated device tree bindings documentation for edge-rate
- The edge-rate is now specified as a "slowdown", meaning that it is now
being specified as positive values instead of negative (both
documentation and implementation wise).
- Only explicitly documented values for "vsc8531,vddmac" and
"vsc8531,edge-slowdown" are accepted by the device driver.
- Deleting include/dt-bindings/net/mscc-phy-vsc8531.h as it was not needed.
Signed-off-by: Allan W. Nielsen <allan.nielsen@...rosemi.com>
Signed-off-by: Raju Lakkaraju <raju.lakkaraju@...rosemi.com>
---
.../devicetree/bindings/net/mscc-phy-vsc8531.txt | 49 ++++++++------
drivers/net/phy/mscc.c | 79 +++++++++++++---------
include/dt-bindings/net/mscc-phy-vsc8531.h | 21 ------
3 files changed, 75 insertions(+), 74 deletions(-)
delete 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 99c7eb0..f552033 100644
--- a/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
+++ b/Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt
@@ -6,20 +6,27 @@ Required properties:
Documentation/devicetree/bindings/net/phy.txt
Optional properties:
-- vsc8531,vddmac : The vddmac in mV.
+- vsc8531,vddmac : The vddmac in mV. Allowed values is listed
+ in the first row of Table 1 (below).
+ This property is only used in combination
+ with the 'edge-slowdown' property.
+ Default value is 3300.
- vsc8531,edge-slowdown : % the edge should be slowed down relative to
- the fastest possible edge time. Native sign
- need not enter.
+ the fastest possible edge time.
Edge rate sets the drive strength of the MAC
- interface output signals. Changing the drive
- strength will affect the edge rate of the output
- signal. The goal of this setting is to help
- reduce electrical emission (EMI) by being able
- to reprogram drive strength and in effect slow
- down the edge rate if desired. Table 1 shows the
- impact to the edge rate per VDDMAC supply for each
- drive strength setting.
- Ref: Table:1 - Edge rate change below.
+ interface output signals. Changing the
+ drive strength will affect the edge rate of
+ the output signal. The goal of this setting
+ is to help reduce electrical emission (EMI)
+ by being able to reprogram drive strength
+ and in effect slow down the edge rate if
+ desired.
+ To adjust the edge-slowdown, the 'vddmac'
+ must be specified. Table 1 lists the
+ supported edge-slowdown values for a given
+ 'vddmac'.
+ Default value is 0%.
+ Ref: Table:1 - Edge rate change (below).
Note: see dt-bindings/net/mscc-phy-vsc8531.h for applicable values
@@ -29,23 +36,23 @@ Table: 1 - Edge rate change
| |
| 3300 mV 2500 mV 1800 mV 1500 mV |
|---------------------------------------------------------------|
-| Default Deafult Default Default |
+| 0% 0% 0% 0% |
| (Fastest) (recommended) (recommended) |
|---------------------------------------------------------------|
-| -2% -3% -5% -6% |
+| 2% 3% 5% 6% |
|---------------------------------------------------------------|
-| -4% -6% -9% -14% |
+| 4% 6% 9% 14% |
|---------------------------------------------------------------|
-| -7% -10% -16% -21% |
+| 7% 10% 16% 21% |
|(recommended) (recommended) |
|---------------------------------------------------------------|
-| -10% -14% -23% -29% |
+| 10% 14% 23% 29% |
|---------------------------------------------------------------|
-| -17% -23% -35% -42% |
+| 17% 23% 35% 42% |
|---------------------------------------------------------------|
-| -29% -37% -52% -58% |
+| 29% 37% 52% 58% |
|---------------------------------------------------------------|
-| -53% -63% -76% -77% |
+| 53% 63% 76% 77% |
| (slowest) |
|---------------------------------------------------------------|
@@ -54,5 +61,5 @@ Example:
vsc8531_0: ethernet-phy@0 {
compatible = "ethernet-phy-id0007.0570";
vsc8531,vddmac = <3300>;
- vsc8531,edge-slowdown = <21>;
+ vsc8531,edge-slowdown = <7>;
};
diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index a17573e..2bd00b6 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -12,7 +12,6 @@
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/of.h>
-#include <dt-bindings/net/mscc-phy-vsc8531.h>
enum rgmii_rx_clock_delay {
RGMII_RX_CLK_DELAY_0_2_NS = 0,
@@ -56,21 +55,27 @@ enum rgmii_rx_clock_delay {
#define PHY_ID_VSC8531 0x00070570
#define PHY_ID_VSC8541 0x00070770
-struct edge_rate_table {
+#define MSCC_VDDMAC_1500 1500
+#define MSCC_VDDMAC_1800 1800
+#define MSCC_VDDMAC_2500 2500
+#define MSCC_VDDMAC_3300 3300
+
+struct vsc8531_edge_rate_table {
u16 vddmac;
- int slowdown[MSCC_SLOWDOWN_MAX];
+ u8 slowdown[8];
};
-struct edge_rate_table edge_table[MSCC_VDDMAC_MAX] = {
- {3300, { 0, -2, -4, -7, -10, -17, -29, -53} },
- {2500, { 0, -3, -6, -10, -14, -23, -37, -63} },
- {1800, { 0, -5, -9, -16, -23, -35, -52, -76} },
- {1500, { 0, -6, -14, -21, -29, -42, -58, -77} },
+static const struct vsc8531_edge_rate_table edge_table[] = {
+ {MSCC_VDDMAC_3300, { 0, 2, 4, 7, 10, 17, 29, 53} },
+ {MSCC_VDDMAC_2500, { 0, 3, 6, 10, 14, 23, 37, 63} },
+ {MSCC_VDDMAC_1800, { 0, 5, 9, 16, 23, 35, 52, 76} },
+ {MSCC_VDDMAC_1500, { 0, 6, 14, 21, 29, 42, 58, 77} },
};
struct vsc8531_private {
u8 edge_slowdown;
u16 vddmac;
+ int rate_magic;
};
static int vsc85xx_phy_page_set(struct phy_device *phydev, u8 page)
@@ -81,29 +86,21 @@ static int vsc85xx_phy_page_set(struct phy_device *phydev, u8 page)
return rc;
}
-static u8 edge_rate_magic_get(u16 vddmac,
- int slowdown)
+static int vsc85xx_edge_rate_magic_get(u16 vddmac, u8 slowdown)
{
- int rc = (MSCC_SLOWDOWN_MAX - 1);
u8 vdd;
u8 sd;
-
- for (vdd = 0; vdd < MSCC_VDDMAC_MAX; vdd++) {
- if (edge_table[vdd].vddmac == vddmac) {
- for (sd = 0; sd < MSCC_SLOWDOWN_MAX; sd++) {
- if (edge_table[vdd].slowdown[sd] <= slowdown) {
- rc = (MSCC_SLOWDOWN_MAX - sd - 1);
- break;
- }
- }
- }
- }
-
- return rc;
+ u8 sd_array_size = ARRAY_SIZE(edge_table[0].slowdown);
+
+ for (vdd = 0; vdd < ARRAY_SIZE(edge_table); vdd++)
+ if (edge_table[vdd].vddmac == vddmac)
+ for (sd = 0; sd < sd_array_size; sd++)
+ if (edge_table[vdd].slowdown[sd] == slowdown)
+ return (sd_array_size - sd - 1);
+ return -EINVAL;
}
-static int vsc85xx_edge_rate_cntl_set(struct phy_device *phydev,
- u8 edge_rate)
+static int vsc85xx_edge_rate_cntl_set(struct phy_device *phydev, u8 edge_rate)
{
int rc;
u16 reg_val;
@@ -199,17 +196,38 @@ static int vsc8531_of_init(struct phy_device *phydev)
&vsc8531->vddmac);
if (rc == -EINVAL)
vsc8531->vddmac = MSCC_VDDMAC_3300;
+
rc = of_property_read_u8(of_node, "vsc8531,edge-slowdown",
&vsc8531->edge_slowdown);
if (rc == -EINVAL)
vsc8531->edge_slowdown = 0;
- rc = 0;
- return rc;
+ vsc8531->rate_magic = vsc85xx_edge_rate_magic_get(
+ vsc8531->vddmac, vsc8531->edge_slowdown);
+ if (vsc8531->rate_magic < 0) {
+ phydev_err(phydev,
+ "Invalid vsc8531,vddmac or vsc8531,edge-slowdown");
+ return vsc8531->rate_magic;
+ }
+
+ return 0;
}
#else
static int vsc8531_of_init(struct phy_device *phydev)
{
+ struct vsc8531_private *vsc8531 = phydev->priv;
+
+ vsc8531->vddmac = MSCC_VDDMAC_3300;
+ vsc8531->edge_slowdown = 0;
+
+ vsc8531->rate_magic = vsc85xx_edge_rate_magic_get(
+ vsc8531->vddmac, vsc8531->edge_slowdown);
+ if (vsc8531->rate_magic < 0) {
+ phydev_err(phydev,
+ "Invalid vsc8531,vddmac or vsc8531,edge-slowdown");
+ return vsc8531->rate_magic;
+ }
+
return 0;
}
#endif /* CONFIG_OF_MDIO */
@@ -218,7 +236,6 @@ static int vsc85xx_config_init(struct phy_device *phydev)
{
int rc;
struct vsc8531_private *vsc8531 = phydev->priv;
- u8 edge_rate;
rc = vsc8531_of_init(phydev);
if (rc)
@@ -232,9 +249,7 @@ static int vsc85xx_config_init(struct phy_device *phydev)
if (rc)
return rc;
- edge_rate = edge_rate_magic_get(vsc8531->vddmac,
- -(int)vsc8531->edge_slowdown);
- rc = vsc85xx_edge_rate_cntl_set(phydev, edge_rate);
+ rc = vsc85xx_edge_rate_cntl_set(phydev, vsc8531->rate_magic);
if (rc)
return rc;
diff --git a/include/dt-bindings/net/mscc-phy-vsc8531.h b/include/dt-bindings/net/mscc-phy-vsc8531.h
deleted file mode 100644
index 2383dd2..0000000
--- a/include/dt-bindings/net/mscc-phy-vsc8531.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * Device Tree constants for Microsemi VSC8531 PHY
- *
- * Author: Nagaraju Lakkaraju
- *
- * License: Dual MIT/GPL
- * Copyright (c) 2016 Microsemi Corporation
- */
-
-#ifndef _DT_BINDINGS_MSCC_VSC8531_H
-#define _DT_BINDINGS_MSCC_VSC8531_H
-
-/* MAC interface Edge rate control VDDMAC in milli Volts */
-#define MSCC_VDDMAC_3300 3300
-#define MSCC_VDDMAC_2500 2500
-#define MSCC_VDDMAC_1800 1800
-#define MSCC_VDDMAC_1500 1500
-#define MSCC_VDDMAC_MAX 4
-#define MSCC_SLOWDOWN_MAX 8
-
-#endif
--
2.7.3
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