Guenter Roeck <linux@xxxxxxxxxxxx> wrote: >On Fri, Feb 08, 2013 at 08:30:48AM +0000, Jonathan Cameron wrote: >> On 07/02/13 17:09, Guenter Roeck wrote: >> >Provide bindings and parse OF data during initialization. >> > >> >Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> >> Looks fine to me. Will give it a few more days to see what others >> have to say. >> >Hi Jonathan, > >Any further feedback on this ? If there is anything else I need to do >to get it accepted, please let me know. Was kind of hoping for a few ack/ reviewed by comments! Missed current merge window so I will pick it up for start of next cycle and assume silence means everyone else is happy! > >Thanks, >Guenter > >> Thanks Guenter >> >--- >> >v5: >> >- Updated examples in bindings. >> >v4: >> >- Fixed wrong parameter to dummy of_iio_channel_get_by_name if >CONFIG_OF is >> > undefined, and wrong return value. >> >- Initialize indio_dev->of_node in iio_device_register if the >calling driver >> > neglected to do it. >> >v3: >> >- Cleaned up documentation (formatting, left-over clock references) >> >- Updated bindings description to permit sub-devices >> >- When searching for iio devices, use the pointer to the iio device >type instead >> > of strcmp. Rename iio_dev_type to iio_device_type (to match other >device >> > types) and make it global for that purpose. Check the OF node >first, then the >> > device type, as the node is less likely to match. >> >- Move the common code in of_iio_channel_get and >of_iio_channel_get_all to >> > __of_iio_channel_get. >> >- Return NULL from of_iio_channel_get_by_name if nothing is found, >or >> > an error if there is a problem with consistency or if the >provider device is >> > not yet available. >> >- In iio_channel_get, return if of_iio_channel_get_by_name() returns >a channel >> > or an error, and continue otherwise. >> >v2: >> >- Rebased to iio/togreg >> >- Documentation update per feedback >> >- Dropped io-channel-output-names from the bindings document. The >property is >> > not used in the code, and it is not entirely clear what it would >be used for. >> > If there is a need for it, we can add it back in later on. >> >- Don't export OF specific API calls >> >- For OF support, no longer depend on iio_map >> >- Add #ifdef CONFIG_OF where appropriate, and ensure that the code >still builds >> > if it is not selected. >> >- Change iio_channel_get to take device pointer as argument instead >of device >> > name. Retain old API as of_iio_channel_get_sys. >> >- iio_channel_get now works for both OF and non-OF configurations >> >- Use regulator to get vref for max1363 driver. >> > >> > .../devicetree/bindings/iio/iio-bindings.txt | 97 >+++++++++++ >> > drivers/iio/iio_core.h | 1 + >> > drivers/iio/industrialio-core.c | 8 +- >> > drivers/iio/inkern.c | 171 >++++++++++++++++++++ >> > 4 files changed, 275 insertions(+), 2 deletions(-) >> > create mode 100644 >Documentation/devicetree/bindings/iio/iio-bindings.txt >> > >> >diff --git a/Documentation/devicetree/bindings/iio/iio-bindings.txt >b/Documentation/devicetree/bindings/iio/iio-bindings.txt >> >new file mode 100644 >> >index 0000000..1182845 >> >--- /dev/null >> >+++ b/Documentation/devicetree/bindings/iio/iio-bindings.txt >> >@@ -0,0 +1,97 @@ >> >+This binding is a work-in-progress. It is derived from clock >bindings, >> >+and based on suggestions from Lars-Peter Clausen [1]. >> >+ >> >+Sources of IIO channels can be represented by any node in the >device >> >+tree. Those nodes are designated as IIO providers. IIO consumer >> >+nodes use a phandle and IIO specifier pair to connect IIO provider >> >+outputs to IIO inputs. Similar to the gpio specifiers, an IIO >> >+specifier is an array of one or more cells identifying the IIO >> >+output on a device. The length of an IIO specifier is defined by >the >> >+value of a #io-channel-cells property in the IIO provider node. >> >+ >> >+[1] http://marc.info/?l=linux-iio&m=135902119507483&w=2 >> >+ >> >+==IIO providers== >> >+ >> >+Required properties: >> >+#io-channel-cells: Number of cells in an IIO specifier; Typically 0 >for nodes >> >+ with a single IIO output and 1 for nodes with multiple >> >+ IIO outputs. >> >+ >> >+Example for a simple configuration with no trigger: >> >+ >> >+ adc: voltage-sensor@35 { >> >+ compatible = "maxim,max1139"; >> >+ reg = <0x35>; >> >+ #io-channel-cells = <1>; >> >+ }; >> >+ >> >+Example for a configuration with trigger: >> >+ >> >+ adc@35 { >> >+ compatible = "some-vendor,some-adc"; >> >+ reg = <0x35>; >> >+ >> >+ adc1: iio-device@0 { >> >+ #io-channel-cells = <1>; >> >+ /* other properties */ >> >+ }; >> >+ adc2: iio-device@1 { >> >+ #io-channel-cells = <1>; >> >+ /* other properties */ >> >+ }; >> >+ }; >> >+ >> >+==IIO consumers== >> >+ >> >+Required properties: >> >+io-channels: List of phandle and IIO specifier pairs, one pair >> >+ for each IIO input to the device. Note: if the >> >+ IIO provider specifies '0' for #io-channel-cells, >> >+ then only the phandle portion of the pair will appear. >> >+ >> >+Optional properties: >> >+io-channel-names: >> >+ List of IIO input name strings sorted in the same >> >+ order as the io-channels property. Consumers drivers >> >+ will use io-channel-names to match IIO input names >> >+ with IIO specifiers. >> >+io-channel-ranges: >> >+ Empty property indicating that child nodes can inherit named >> >+ IIO channels from this node. Useful for bus nodes to provide >> >+ and IIO channel to their children. >> >+ >> >+For example: >> >+ >> >+ device { >> >+ io-channels = <&adc 1>, <&ref 0>; >> >+ io-channel-names = "vcc", "vdd"; >> >+ }; >> >+ >> >+This represents a device with two IIO inputs, named "vcc" and >"vdd". >> >+The vcc channel is connected to output 1 of the &adc device, and >the >> >+vdd channel is connected to output 0 of the &ref device. >> >+ >> >+==Example== >> >+ >> >+ adc: max1139@35 { >> >+ compatible = "maxim,max1139"; >> >+ reg = <0x35>; >> >+ #io-channel-cells = <1>; >> >+ }; >> >+ >> >+ ... >> >+ >> >+ iio_hwmon { >> >+ compatible = "iio-hwmon"; >> >+ io-channels = <&adc 0>, <&adc 1>, <&adc 2>, >> >+ <&adc 3>, <&adc 4>, <&adc 5>, >> >+ <&adc 6>, <&adc 7>, <&adc 8>, >> >+ <&adc 9>; >> >+ }; >> >+ >> >+ some_consumer { >> >+ compatible = "some-consumer"; >> >+ io-channels = <&adc 10>, <&adc 11>; >> >+ io-channel-names = "adc1", "adc2"; >> >+ }; >> >diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h >> >index f652e6a..05c1b74 100644 >> >--- a/drivers/iio/iio_core.h >> >+++ b/drivers/iio/iio_core.h >> >@@ -18,6 +18,7 @@ >> > struct iio_chan_spec; >> > struct iio_dev; >> > >> >+extern struct device_type iio_device_type; >> > >> > int __iio_add_chan_devattr(const char *postfix, >> > struct iio_chan_spec const *chan, >> >diff --git a/drivers/iio/industrialio-core.c >b/drivers/iio/industrialio-core.c >> >index 8848f16..6d8b027 100644 >> >--- a/drivers/iio/industrialio-core.c >> >+++ b/drivers/iio/industrialio-core.c >> >@@ -847,7 +847,7 @@ static void iio_dev_release(struct device >*device) >> > kfree(indio_dev); >> > } >> > >> >-static struct device_type iio_dev_type = { >> >+struct device_type iio_device_type = { >> > .name = "iio_device", >> > .release = iio_dev_release, >> > }; >> >@@ -869,7 +869,7 @@ struct iio_dev *iio_device_alloc(int >sizeof_priv) >> > >> > if (dev) { >> > dev->dev.groups = dev->groups; >> >- dev->dev.type = &iio_dev_type; >> >+ dev->dev.type = &iio_device_type; >> > dev->dev.bus = &iio_bus_type; >> > device_initialize(&dev->dev); >> > dev_set_drvdata(&dev->dev, (void *)dev); >> >@@ -960,6 +960,10 @@ int iio_device_register(struct iio_dev >*indio_dev) >> > { >> > int ret; >> > >> >+ /* If the calling driver did not initialize of_node, do it here */ >> >+ if (!indio_dev->dev.of_node && indio_dev->dev.parent) >> >+ indio_dev->dev.of_node = indio_dev->dev.parent->of_node; >> >+ >> > /* configure elements for the chrdev */ >> > indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); >> > >> >diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c >> >index b289915..795d100 100644 >> >--- a/drivers/iio/inkern.c >> >+++ b/drivers/iio/inkern.c >> >@@ -10,6 +10,7 @@ >> > #include <linux/export.h> >> > #include <linux/slab.h> >> > #include <linux/mutex.h> >> >+#include <linux/of.h> >> > >> > #include <linux/iio/iio.h> >> > #include "iio_core.h" >> >@@ -92,6 +93,164 @@ static const struct iio_chan_spec >> > return chan; >> > } >> > >> >+#ifdef CONFIG_OF >> >+ >> >+static int iio_dev_node_match(struct device *dev, void *data) >> >+{ >> >+ return dev->of_node == data && dev->type == &iio_device_type; >> >+} >> >+ >> >+static int __of_iio_channel_get(struct iio_channel *channel, >> >+ struct device_node *np, int index) >> >+{ >> >+ struct device *idev; >> >+ struct iio_dev *indio_dev; >> >+ int err; >> >+ struct of_phandle_args iiospec; >> >+ >> >+ err = of_parse_phandle_with_args(np, "io-channels", >> >+ "#io-channel-cells", >> >+ index, &iiospec); >> >+ if (err) >> >+ return err; >> >+ >> >+ idev = bus_find_device(&iio_bus_type, NULL, iiospec.np, >> >+ iio_dev_node_match); >> >+ of_node_put(iiospec.np); >> >+ if (idev == NULL) >> >+ return -EPROBE_DEFER; >> >+ >> >+ indio_dev = dev_to_iio_dev(idev); >> >+ channel->indio_dev = indio_dev; >> >+ index = iiospec.args_count ? iiospec.args[0] : 0; >> >+ if (index >= indio_dev->num_channels) { >> >+ return -EINVAL; >> >+ goto err_put; >> >+ } >> >+ channel->channel = &indio_dev->channels[index]; >> >+ >> >+ return 0; >> >+ >> >+err_put: >> >+ iio_device_put(indio_dev); >> >+ return err; >> >+} >> >+ >> >+static struct iio_channel *of_iio_channel_get(struct device_node >*np, int index) >> >+{ >> >+ struct iio_channel *channel; >> >+ int err; >> >+ >> >+ if (index < 0) >> >+ return ERR_PTR(-EINVAL); >> >+ >> >+ channel = kzalloc(sizeof(*channel), GFP_KERNEL); >> >+ if (channel == NULL) >> >+ return ERR_PTR(-ENOMEM); >> >+ >> >+ err = __of_iio_channel_get(channel, np, index); >> >+ if (err) >> >+ goto err_free_channel; >> >+ >> >+ return channel; >> >+ >> >+err_free_channel: >> >+ kfree(channel); >> >+ return ERR_PTR(err); >> >+} >> >+ >> >+static struct iio_channel *of_iio_channel_get_by_name(struct >device_node *np, >> >+ const char *name) >> >+{ >> >+ struct iio_channel *chan = NULL; >> >+ >> >+ /* Walk up the tree of devices looking for a matching iio channel >*/ >> >+ while (np) { >> >+ int index = 0; >> >+ >> >+ /* >> >+ * For named iio channels, first look up the name in the >> >+ * "io-channel-names" property. If it cannot be found, the >> >+ * index will be an error code, and of_iio_channel_get() >> >+ * will fail. >> >+ */ >> >+ if (name) >> >+ index = of_property_match_string(np, "io-channel-names", >> >+ name); >> >+ chan = of_iio_channel_get(np, index); >> >+ if (!IS_ERR(chan)) >> >+ break; >> >+ else if (name && index >= 0) { >> >+ pr_err("ERROR: could not get IIO channel %s:%s(%i)\n", >> >+ np->full_name, name ? name : "", index); >> >+ return chan; >> >+ } >> >+ >> >+ /* >> >+ * No matching IIO channel found on this node. >> >+ * If the parent node has a "io-channel-ranges" property, >> >+ * then we can try one of its channels. >> >+ */ >> >+ np = np->parent; >> >+ if (np && !of_get_property(np, "io-channel-ranges", NULL)) >> >+ break; >> >+ } >> >+ return chan; >> >+} >> >+ >> >+static struct iio_channel *of_iio_channel_get_all(struct device >*dev) >> >+{ >> >+ struct iio_channel *chans; >> >+ int i, mapind, nummaps = 0; >> >+ int ret; >> >+ >> >+ do { >> >+ ret = of_parse_phandle_with_args(dev->of_node, >> >+ "io-channels", >> >+ "#io-channel-cells", >> >+ nummaps, NULL); >> >+ if (ret < 0) >> >+ break; >> >+ } while (++nummaps); >> >+ >> >+ if (nummaps == 0) /* no error, return NULL to search map table */ >> >+ return NULL; >> >+ >> >+ /* NULL terminated array to save passing size */ >> >+ chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); >> >+ if (chans == NULL) >> >+ return ERR_PTR(-ENOMEM); >> >+ >> >+ /* Search for OF matches */ >> >+ for (mapind = 0; mapind < nummaps; mapind++) { >> >+ ret = __of_iio_channel_get(&chans[mapind], dev->of_node, >> >+ mapind); >> >+ if (ret) >> >+ goto error_free_chans; >> >+ } >> >+ return chans; >> >+ >> >+error_free_chans: >> >+ for (i = 0; i < mapind; i++) >> >+ iio_device_put(chans[i].indio_dev); >> >+ kfree(chans); >> >+ return ERR_PTR(ret); >> >+} >> >+ >> >+#else /* CONFIG_OF */ >> >+ >> >+static inline struct iio_channel * >> >+of_iio_channel_get_by_name(struct device_node *np, const char >*name) >> >+{ >> >+ return NULL; >> >+} >> >+ >> >+static inline struct iio_channel *of_iio_channel_get_all(struct >device *dev) >> >+{ >> >+ return NULL; >> >+} >> >+ >> >+#endif /* CONFIG_OF */ >> > >> > static struct iio_channel *iio_channel_get_sys(const char *name, >> > const char *channel_name) >> >@@ -150,7 +309,14 @@ struct iio_channel *iio_channel_get(struct >device *dev, >> > const char *channel_name) >> > { >> > const char *name = dev ? dev_name(dev) : NULL; >> >+ struct iio_channel *channel; >> > >> >+ if (dev) { >> >+ channel = of_iio_channel_get_by_name(dev->of_node, >> >+ channel_name); >> >+ if (channel != NULL) >> >+ return channel; >> >+ } >> > return iio_channel_get_sys(name, channel_name); >> > } >> > EXPORT_SYMBOL_GPL(iio_channel_get); >> >@@ -173,6 +339,11 @@ struct iio_channel *iio_channel_get_all(struct >device *dev) >> > >> > if (dev == NULL) >> > return ERR_PTR(-EINVAL); >> >+ >> >+ chans = of_iio_channel_get_all(dev); >> >+ if (chans) >> >+ return chans; >> >+ >> > name = dev_name(dev); >> > >> > mutex_lock(&iio_map_list_lock); >> > >> >> -- Sent from my Android phone with K-9 Mail. 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