]> git.sur5r.net Git - u-boot/commitdiff
dm: i2c: Add support for multiplexed I2C buses
authorSimon Glass <sjg@chromium.org>
Mon, 3 Aug 2015 14:19:21 +0000 (08:19 -0600)
committerSimon Glass <sjg@chromium.org>
Thu, 6 Aug 2015 03:06:10 +0000 (21:06 -0600)
Add a new I2C_MUX uclass. Devices in this class can multiplex between
several I2C buses, selecting them one at a time for use by the system.
The multiplexing mechanism is left to the driver to decide - it may be
controlled by GPIOs, for example.

The uclass supports only two methods: select() and deselect().

The current mux state is expected to be stored in the mux itself since
it is the only thing that knows how to make things work. The mux can
record the current state and then avoid switching unless it is necessary.
So select() can be skipped if the mux is already in the correct state.
Also deselect() can be made a nop if required.

Signed-off-by: Simon Glass <sjg@chromium.org>
doc/device-tree-bindings/i2c/i2c-mux.txt [new file with mode: 0644]
drivers/i2c/Kconfig
drivers/i2c/Makefile
drivers/i2c/muxes/Kconfig [new file with mode: 0644]
drivers/i2c/muxes/Makefile [new file with mode: 0644]
drivers/i2c/muxes/i2c-mux-uclass.c [new file with mode: 0644]
include/dm/uclass-id.h
include/i2c.h

diff --git a/doc/device-tree-bindings/i2c/i2c-mux.txt b/doc/device-tree-bindings/i2c/i2c-mux.txt
new file mode 100644 (file)
index 0000000..af84cce
--- /dev/null
@@ -0,0 +1,60 @@
+Common i2c bus multiplexer/switch properties.
+
+An i2c bus multiplexer/switch will have several child busses that are
+numbered uniquely in a device dependent manner.  The nodes for an i2c bus
+multiplexer/switch will have one child node for each child
+bus.
+
+Required properties:
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Required properties for child nodes:
+- #address-cells = <1>;
+- #size-cells = <0>;
+- reg : The sub-bus number.
+
+Optional properties for child nodes:
+- Other properties specific to the multiplexer/switch hardware.
+- Child nodes conforming to i2c bus binding
+
+
+Example :
+
+       /*
+          An NXP pca9548 8 channel I2C multiplexer at address 0x70
+          with two NXP pca8574 GPIO expanders attached, one each to
+          ports 3 and 4.
+        */
+
+       mux@70 {
+               compatible = "nxp,pca9548";
+               reg = <0x70>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               i2c@3 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <3>;
+
+                       gpio1: gpio@38 {
+                               compatible = "nxp,pca8574";
+                               reg = <0x38>;
+                               #gpio-cells = <2>;
+                               gpio-controller;
+                       };
+               };
+               i2c@4 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <4>;
+
+                       gpio2: gpio@38 {
+                               compatible = "nxp,pca8574";
+                               reg = <0x38>;
+                               #gpio-cells = <2>;
+                               gpio-controller;
+                       };
+               };
+       };
index 86fb36b5d4c0266fc609a69803588f9d5067eaf0..caee3d83386e42845d9421a1b1ff0acbb17abdb3 100644 (file)
@@ -73,3 +73,5 @@ config SYS_I2C_UNIPHIER_F
        help
          Support for UniPhier FIFO-builtin I2C controller driver.
          This I2C controller is used on PH1-Pro4 or newer UniPhier SoCs.
+
+source "drivers/i2c/muxes/Kconfig"
index d9e912f78647873bd7d949ac51a047d8b083b6f9..dc9e81bf76af245afa860515bcac0ca9fa075b0b 100644 (file)
@@ -37,3 +37,5 @@ obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o
 obj-$(CONFIG_SYS_I2C_UNIPHIER) += i2c-uniphier.o
 obj-$(CONFIG_SYS_I2C_UNIPHIER_F) += i2c-uniphier-f.o
 obj-$(CONFIG_SYS_I2C_ZYNQ) += zynq_i2c.o
+
+obj-y += muxes/
diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
new file mode 100644 (file)
index 0000000..a05b32d
--- /dev/null
@@ -0,0 +1,8 @@
+config I2C_MUX
+       bool "Suport I2C multiplexers"
+       depends on DM_I2C
+       help
+         This enables I2C buses to be multiplexed, so that you can select
+         one of several buses using some sort of control mechanism. The
+         bus select is handled automatically when that bus is accessed,
+         using a suitable I2C MUX driver.
diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile
new file mode 100644 (file)
index 0000000..7583e3a
--- /dev/null
@@ -0,0 +1,6 @@
+#
+# Copyright (c) 2015 Google, Inc
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+obj-$(CONFIG_I2C_MUX) += i2c-mux-uclass.o
diff --git a/drivers/i2c/muxes/i2c-mux-uclass.c b/drivers/i2c/muxes/i2c-mux-uclass.c
new file mode 100644 (file)
index 0000000..3f52bff
--- /dev/null
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * struct i2c_mux: Information the uclass stores about an I2C mux
+ *
+ * @selected:  Currently selected mux, or -1 for none
+ * @i2c_bus: I2C bus to use for communcation
+ */
+struct i2c_mux {
+       int selected;
+       struct udevice *i2c_bus;
+};
+
+/**
+ * struct i2c_mux_bus: Information about each bus the mux controls
+ *
+ * @channel: Channel number used to select this bus
+ */
+struct i2c_mux_bus {
+       uint channel;
+};
+
+/* Find out the mux channel number */
+static int i2c_mux_child_post_bind(struct udevice *dev)
+{
+       struct i2c_mux_bus *plat = dev_get_parent_platdata(dev);
+       int channel;
+
+       channel = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
+       if (channel < 0)
+               return -EINVAL;
+       plat->channel = channel;
+
+       return 0;
+}
+
+/* Find the I2C buses selected by this mux */
+static int i2c_mux_post_bind(struct udevice *mux)
+{
+       const void *blob = gd->fdt_blob;
+       int ret;
+       int offset;
+
+       debug("%s: %s\n", __func__, mux->name);
+       /*
+        * There is no compatible string in the sub-nodes, so we must manually
+        * bind these
+        */
+       for (offset = fdt_first_subnode(blob, mux->of_offset);
+            offset > 0;
+            offset = fdt_next_subnode(blob, offset)) {
+               struct udevice *dev;
+               const char *name;
+
+               name = fdt_get_name(blob, offset, NULL);
+               ret = device_bind_driver_to_node(mux, "i2c_mux_bus_drv", name,
+                                                offset, &dev);
+               debug("   - bind ret=%d, %s\n", ret, dev ? dev->name : NULL);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+/* Set up the mux ready for use */
+static int i2c_mux_post_probe(struct udevice *mux)
+{
+       struct i2c_mux *priv = dev_get_uclass_priv(mux);
+       int ret;
+
+       debug("%s: %s\n", __func__, mux->name);
+       priv->selected = -1;
+
+       ret = uclass_get_device_by_phandle(UCLASS_I2C, mux, "i2c-parent",
+                                          &priv->i2c_bus);
+       if (ret)
+               return ret;
+       debug("%s: bus=%p/%s\n", __func__, priv->i2c_bus, priv->i2c_bus->name);
+
+       return 0;
+}
+
+int i2c_mux_select(struct udevice *dev)
+{
+       struct i2c_mux_bus *plat = dev_get_parent_platdata(dev);
+       struct udevice *mux = dev->parent;
+       struct i2c_mux_ops *ops = i2c_mux_get_ops(mux);
+
+       if (!ops->select)
+               return -ENOSYS;
+
+       return ops->select(mux, dev, plat->channel);
+}
+
+int i2c_mux_deselect(struct udevice *dev)
+{
+       struct i2c_mux_bus *plat = dev_get_parent_platdata(dev);
+       struct udevice *mux = dev->parent;
+       struct i2c_mux_ops *ops = i2c_mux_get_ops(mux);
+
+       if (!ops->deselect)
+               return -ENOSYS;
+
+       return ops->deselect(mux, dev, plat->channel);
+}
+
+static int i2c_mux_bus_set_bus_speed(struct udevice *dev, unsigned int speed)
+{
+       struct udevice *mux = dev->parent;
+       struct i2c_mux *priv = dev_get_uclass_priv(mux);
+       int ret, ret2;
+
+       ret = i2c_mux_select(dev);
+       if (ret)
+               return ret;
+       ret = dm_i2c_set_bus_speed(priv->i2c_bus, speed);
+       ret2 = i2c_mux_deselect(dev);
+
+       return ret ? ret : ret2;
+}
+
+static int i2c_mux_bus_probe(struct udevice *dev, uint chip_addr,
+                            uint chip_flags)
+{
+       struct udevice *mux = dev->parent;
+       struct i2c_mux *priv = dev_get_uclass_priv(mux);
+       struct dm_i2c_ops *ops = i2c_get_ops(priv->i2c_bus);
+       int ret, ret2;
+
+       debug("%s: %s, bus %s\n", __func__, dev->name, priv->i2c_bus->name);
+       if (!ops->probe_chip)
+               return -ENOSYS;
+       ret = i2c_mux_select(dev);
+       if (ret)
+               return ret;
+       ret = ops->probe_chip(priv->i2c_bus, chip_addr, chip_flags);
+       ret2 = i2c_mux_deselect(dev);
+
+       return ret ? ret : ret2;
+}
+
+static int i2c_mux_bus_xfer(struct udevice *dev, struct i2c_msg *msg,
+                           int nmsgs)
+{
+       struct udevice *mux = dev->parent;
+       struct i2c_mux *priv = dev_get_uclass_priv(mux);
+       struct dm_i2c_ops *ops = i2c_get_ops(priv->i2c_bus);
+       int ret, ret2;
+
+       debug("%s: %s, bus %s\n", __func__, dev->name, priv->i2c_bus->name);
+       if (!ops->xfer)
+               return -ENOSYS;
+       ret = i2c_mux_select(dev);
+       if (ret)
+               return ret;
+       ret = ops->xfer(priv->i2c_bus, msg, nmsgs);
+       ret2 = i2c_mux_deselect(dev);
+
+       return ret ? ret : ret2;
+}
+
+static const struct dm_i2c_ops i2c_mux_bus_ops = {
+       .xfer           = i2c_mux_bus_xfer,
+       .probe_chip     = i2c_mux_bus_probe,
+       .set_bus_speed  = i2c_mux_bus_set_bus_speed,
+};
+
+U_BOOT_DRIVER(i2c_mux_bus) = {
+       .name           = "i2c_mux_bus_drv",
+       .id             = UCLASS_I2C,
+       .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip),
+       .ops    = &i2c_mux_bus_ops,
+};
+
+UCLASS_DRIVER(i2c_mux) = {
+       .id             = UCLASS_I2C_MUX,
+       .name           = "i2c_mux",
+       .post_bind      = i2c_mux_post_bind,
+       .post_probe     = i2c_mux_post_probe,
+       .per_device_auto_alloc_size = sizeof(struct i2c_mux),
+       .per_child_platdata_auto_alloc_size = sizeof(struct i2c_mux_bus),
+       .child_post_bind = i2c_mux_child_post_bind,
+};
index bc057d7adf05aa769f811bada96771a3b6a4f7e1..777b101842dd7e5fb9e7745e34f28f12014fc899 100644 (file)
@@ -35,6 +35,7 @@ enum uclass_id {
        UCLASS_I2C,             /* I2C bus */
        UCLASS_I2C_EEPROM,      /* I2C EEPROM device */
        UCLASS_I2C_GENERIC,     /* Generic I2C device */
+       UCLASS_I2C_MUX,         /* I2C multiplexer */
        UCLASS_LED,             /* Light-emitting diode (LED) */
        UCLASS_LPC,             /* x86 'low pin count' interface */
        UCLASS_MASS_STORAGE,    /* Mass storage device */
index d19182931c57a328981721ceaf8dbf8edabeb998..6493931c3539daac140518146974ee49e83ca1ff 100644 (file)
@@ -444,6 +444,45 @@ struct dm_i2c_ops {
 
 #define i2c_get_ops(dev)       ((struct dm_i2c_ops *)(dev)->driver->ops)
 
+/**
+ * struct i2c_mux_ops - operations for an I2C mux
+ *
+ * The current mux state is expected to be stored in the mux itself since
+ * it is the only thing that knows how to make things work. The mux can
+ * record the current state and then avoid switching unless it is necessary.
+ * So select() can be skipped if the mux is already in the correct state.
+ * Also deselect() can be made a nop if required.
+ */
+struct i2c_mux_ops {
+       /**
+        * select() - select one of of I2C buses attached to a mux
+        *
+        * This will be called when there is no bus currently selected by the
+        * mux. This method does not need to deselect the old bus since
+        * deselect() will be already have been called if necessary.
+        *
+        * @mux:        Mux device
+        * @bus:        I2C bus to select
+        * @channel:    Channel number correponding to the bus to select
+        * @return 0 if OK, -ve on error
+        */
+       int (*select)(struct udevice *mux, struct udevice *bus, uint channel);
+
+       /**
+        * deselect() - select one of of I2C buses attached to a mux
+        *
+        * This is used to deselect the currently selected I2C bus.
+        *
+        * @mux:        Mux device
+        * @bus:        I2C bus to deselect
+        * @channel:    Channel number correponding to the bus to deselect
+        * @return 0 if OK, -ve on error
+        */
+       int (*deselect)(struct udevice *mux, struct udevice *bus, uint channel);
+};
+
+#define i2c_mux_get_ops(dev)   ((struct i2c_mux_ops *)(dev)->driver->ops)
+
 /**
  * i2c_get_chip() - get a device to use to access a chip on a bus
  *