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-rw-r--r--Documentation/devicetree/bindings/net/mdio-mux-gpio.txt127
-rw-r--r--drivers/net/phy/Kconfig10
-rw-r--r--drivers/net/phy/Makefile1
-rw-r--r--drivers/net/phy/mdio-mux-gpio.c142
4 files changed, 280 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/mdio-mux-gpio.txt b/Documentation/devicetree/bindings/net/mdio-mux-gpio.txt
new file mode 100644
index 000000000000..79384113c2b0
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/mdio-mux-gpio.txt
@@ -0,0 +1,127 @@
1Properties for an MDIO bus multiplexer/switch controlled by GPIO pins.
2
3This is a special case of a MDIO bus multiplexer. One or more GPIO
4lines are used to control which child bus is connected.
5
6Required properties in addition to the generic multiplexer properties:
7
8- compatible : mdio-mux-gpio.
9- gpios : GPIO specifiers for each GPIO line. One or more must be specified.
10
11
12Example :
13
14 /* The parent MDIO bus. */
15 smi1: mdio@1180000001900 {
16 compatible = "cavium,octeon-3860-mdio";
17 #address-cells = <1>;
18 #size-cells = <0>;
19 reg = <0x11800 0x00001900 0x0 0x40>;
20 };
21
22 /*
23 An NXP sn74cbtlv3253 dual 1-of-4 switch controlled by a
24 pair of GPIO lines. Child busses 2 and 3 populated with 4
25 PHYs each.
26 */
27 mdio-mux {
28 compatible = "mdio-mux-gpio";
29 gpios = <&gpio1 3 0>, <&gpio1 4 0>;
30 mdio-parent-bus = <&smi1>;
31 #address-cells = <1>;
32 #size-cells = <0>;
33
34 mdio@2 {
35 reg = <2>;
36 #address-cells = <1>;
37 #size-cells = <0>;
38
39 phy11: ethernet-phy@1 {
40 reg = <1>;
41 compatible = "marvell,88e1149r";
42 marvell,reg-init = <3 0x10 0 0x5777>,
43 <3 0x11 0 0x00aa>,
44 <3 0x12 0 0x4105>,
45 <3 0x13 0 0x0a60>;
46 interrupt-parent = <&gpio>;
47 interrupts = <10 8>; /* Pin 10, active low */
48 };
49 phy12: ethernet-phy@2 {
50 reg = <2>;
51 compatible = "marvell,88e1149r";
52 marvell,reg-init = <3 0x10 0 0x5777>,
53 <3 0x11 0 0x00aa>,
54 <3 0x12 0 0x4105>,
55 <3 0x13 0 0x0a60>;
56 interrupt-parent = <&gpio>;
57 interrupts = <10 8>; /* Pin 10, active low */
58 };
59 phy13: ethernet-phy@3 {
60 reg = <3>;
61 compatible = "marvell,88e1149r";
62 marvell,reg-init = <3 0x10 0 0x5777>,
63 <3 0x11 0 0x00aa>,
64 <3 0x12 0 0x4105>,
65 <3 0x13 0 0x0a60>;
66 interrupt-parent = <&gpio>;
67 interrupts = <10 8>; /* Pin 10, active low */
68 };
69 phy14: ethernet-phy@4 {
70 reg = <4>;
71 compatible = "marvell,88e1149r";
72 marvell,reg-init = <3 0x10 0 0x5777>,
73 <3 0x11 0 0x00aa>,
74 <3 0x12 0 0x4105>,
75 <3 0x13 0 0x0a60>;
76 interrupt-parent = <&gpio>;
77 interrupts = <10 8>; /* Pin 10, active low */
78 };
79 };
80
81 mdio@3 {
82 reg = <3>;
83 #address-cells = <1>;
84 #size-cells = <0>;
85
86 phy21: ethernet-phy@1 {
87 reg = <1>;
88 compatible = "marvell,88e1149r";
89 marvell,reg-init = <3 0x10 0 0x5777>,
90 <3 0x11 0 0x00aa>,
91 <3 0x12 0 0x4105>,
92 <3 0x13 0 0x0a60>;
93 interrupt-parent = <&gpio>;
94 interrupts = <12 8>; /* Pin 12, active low */
95 };
96 phy22: ethernet-phy@2 {
97 reg = <2>;
98 compatible = "marvell,88e1149r";
99 marvell,reg-init = <3 0x10 0 0x5777>,
100 <3 0x11 0 0x00aa>,
101 <3 0x12 0 0x4105>,
102 <3 0x13 0 0x0a60>;
103 interrupt-parent = <&gpio>;
104 interrupts = <12 8>; /* Pin 12, active low */
105 };
106 phy23: ethernet-phy@3 {
107 reg = <3>;
108 compatible = "marvell,88e1149r";
109 marvell,reg-init = <3 0x10 0 0x5777>,
110 <3 0x11 0 0x00aa>,
111 <3 0x12 0 0x4105>,
112 <3 0x13 0 0x0a60>;
113 interrupt-parent = <&gpio>;
114 interrupts = <12 8>; /* Pin 12, active low */
115 };
116 phy24: ethernet-phy@4 {
117 reg = <4>;
118 compatible = "marvell,88e1149r";
119 marvell,reg-init = <3 0x10 0 0x5777>,
120 <3 0x11 0 0x00aa>,
121 <3 0x12 0 0x4105>,
122 <3 0x13 0 0x0a60>;
123 interrupt-parent = <&gpio>;
124 interrupts = <12 8>; /* Pin 12, active low */
125 };
126 };
127 };
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 99c0674a5935..944cdfb80fe4 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -144,6 +144,16 @@ config MDIO_BUS_MUX
144 to a parent bus. Switching between child busses is done by 144 to a parent bus. Switching between child busses is done by
145 device specific drivers. 145 device specific drivers.
146 146
147config MDIO_BUS_MUX_GPIO
148 tristate "Support for GPIO controlled MDIO bus multiplexers"
149 depends on OF_GPIO && OF_MDIO
150 select MDIO_BUS_MUX
151 help
152 This module provides a driver for MDIO bus multiplexers that
153 are controlled via GPIO lines. The multiplexer connects one of
154 several child MDIO busses to a parent bus. Child bus
155 selection is under the control of GPIO lines.
156
147endif # PHYLIB 157endif # PHYLIB
148 158
149config MICREL_KS8995MA 159config MICREL_KS8995MA
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index a6b50e7715d0..f51af688ef8b 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o
26obj-$(CONFIG_MICREL_KS8995MA) += spi_ks8995.o 26obj-$(CONFIG_MICREL_KS8995MA) += spi_ks8995.o
27obj-$(CONFIG_AMD_PHY) += amd.o 27obj-$(CONFIG_AMD_PHY) += amd.o
28obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o 28obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o
29obj-$(CONFIG_MDIO_BUS_MUX_GPIO) += mdio-mux-gpio.o
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
new file mode 100644
index 000000000000..e0cc4ef33dee
--- /dev/null
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -0,0 +1,142 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2011, 2012 Cavium, Inc.
7 */
8
9#include <linux/platform_device.h>
10#include <linux/device.h>
11#include <linux/of_mdio.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/phy.h>
15#include <linux/mdio-mux.h>
16#include <linux/of_gpio.h>
17
18#define DRV_VERSION "1.0"
19#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
20
21#define MDIO_MUX_GPIO_MAX_BITS 8
22
23struct mdio_mux_gpio_state {
24 int gpio[MDIO_MUX_GPIO_MAX_BITS];
25 unsigned int num_gpios;
26 void *mux_handle;
27};
28
29static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
30 void *data)
31{
32 int change;
33 unsigned int n;
34 struct mdio_mux_gpio_state *s = data;
35
36 if (current_child == desired_child)
37 return 0;
38
39 change = current_child == -1 ? -1 : current_child ^ desired_child;
40
41 for (n = 0; n < s->num_gpios; n++) {
42 if (change & 1)
43 gpio_set_value_cansleep(s->gpio[n],
44 (desired_child & 1) != 0);
45 change >>= 1;
46 desired_child >>= 1;
47 }
48
49 return 0;
50}
51
52static int __devinit mdio_mux_gpio_probe(struct platform_device *pdev)
53{
54 enum of_gpio_flags f;
55 struct mdio_mux_gpio_state *s;
56 unsigned int num_gpios;
57 unsigned int n;
58 int r;
59
60 if (!pdev->dev.of_node)
61 return -ENODEV;
62
63 num_gpios = of_gpio_count(pdev->dev.of_node);
64 if (num_gpios == 0 || num_gpios > MDIO_MUX_GPIO_MAX_BITS)
65 return -ENODEV;
66
67 s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
68 if (!s)
69 return -ENOMEM;
70
71 s->num_gpios = num_gpios;
72
73 for (n = 0; n < num_gpios; ) {
74 int gpio = of_get_gpio_flags(pdev->dev.of_node, n, &f);
75 if (gpio < 0) {
76 r = (gpio == -ENODEV) ? -EPROBE_DEFER : gpio;
77 goto err;
78 }
79 s->gpio[n] = gpio;
80
81 n++;
82
83 r = gpio_request(gpio, "mdio_mux_gpio");
84 if (r)
85 goto err;
86
87 r = gpio_direction_output(gpio, 0);
88 if (r)
89 goto err;
90 }
91
92 r = mdio_mux_init(&pdev->dev,
93 mdio_mux_gpio_switch_fn, &s->mux_handle, s);
94
95 if (r == 0) {
96 pdev->dev.platform_data = s;
97 return 0;
98 }
99err:
100 while (n) {
101 n--;
102 gpio_free(s->gpio[n]);
103 }
104 devm_kfree(&pdev->dev, s);
105 return r;
106}
107
108static int __devexit mdio_mux_gpio_remove(struct platform_device *pdev)
109{
110 struct mdio_mux_gpio_state *s = pdev->dev.platform_data;
111 mdio_mux_uninit(s->mux_handle);
112 return 0;
113}
114
115static struct of_device_id mdio_mux_gpio_match[] = {
116 {
117 .compatible = "mdio-mux-gpio",
118 },
119 {
120 /* Legacy compatible property. */
121 .compatible = "cavium,mdio-mux-sn74cbtlv3253",
122 },
123 {},
124};
125MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
126
127static struct platform_driver mdio_mux_gpio_driver = {
128 .driver = {
129 .name = "mdio-mux-gpio",
130 .owner = THIS_MODULE,
131 .of_match_table = mdio_mux_gpio_match,
132 },
133 .probe = mdio_mux_gpio_probe,
134 .remove = __devexit_p(mdio_mux_gpio_remove),
135};
136
137module_platform_driver(mdio_mux_gpio_driver);
138
139MODULE_DESCRIPTION(DRV_DESCRIPTION);
140MODULE_VERSION(DRV_VERSION);
141MODULE_AUTHOR("David Daney");
142MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-11 12:43:02 -0400