On Fri, Sep 24, 2010 at 04:14:53PM -0600, Grant Likely wrote:
> Commit 959e85f7, "i2c: add OF-style registration and binding" caused a
> module dependency loop where of_i2c.c calls functions in i2c-core, and
> i2c-core calls of_i2c_register_devices() in of_i2c. This means that
> when i2c support is built as a module when CONFIG_OF is set, then
> neither i2c_core nor of_i2c are able to be loaded.
>
> This patch fixes the problem by moving the of_i2c_register_devices()
> function into the body of i2c_core and renaming it to
> i2c_scan_of_devices (of_i2c_register_devices is analogous to the
> existing i2c_scan_static_board_info function and so should be named
> similarly). This function isn't called by any code outside of
> i2c_core, and it must always be present when CONFIG_OF is selected, so
> it makes sense to locate it there. When CONFIG_OF is not selected,
> of_i2c_register_devices() becomes a no-op.
>
> Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
> ---
> drivers/i2c/i2c-core.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++--
> drivers/of/of_i2c.c | 57 ---------------------------------------------
> include/linux/of_i2c.h | 7 ------
> 3 files changed, 59 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 6649176..64a261b 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -32,8 +32,8 @@
> #include <linux/init.h>
> #include <linux/idr.h>
> #include <linux/mutex.h>
> -#include <linux/of_i2c.h>
> #include <linux/of_device.h>
> +#include <linux/of_irq.h>
> #include <linux/completion.h>
> #include <linux/hardirq.h>
> #include <linux/irqflags.h>
> @@ -818,6 +818,63 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
> up_read(&__i2c_board_lock);
> }
>
> +#ifdef CONFIG_OF
> +void i2c_scan_of_devices(struct i2c_adapter *adap)
> +{
> + void *result;
> + struct device_node *node;
> +
> + /* Only register child devices if the adapter has a node pointer set */
> + if (!adap->dev.of_node)
> + return;
> +
> + for_each_child_of_node(adap->dev.of_node, node) {
> + struct i2c_board_info info = {};
> + struct dev_archdata dev_ad = {};
> + const __be32 *addr;
> + int len;
> +
> + dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
> + if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
> + dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
> + node->full_name);
> + continue;
> + }
> +
> + addr = of_get_property(node, "reg", &len);
> + if (!addr || (len < sizeof(int))) {
> + dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
> + node->full_name);
> + continue;
> + }
> +
> + info.addr = be32_to_cpup(addr);
> + if (info.addr > (1 << 10) - 1) {
> + dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
> + info.addr, node->full_name);
> + continue;
> + }
> +
> + info.irq = irq_of_parse_and_map(node, 0);
> + info.of_node = of_node_get(node);
> + info.archdata = &dev_ad;
> +
> + request_module("%s", info.type);
> +
> + result = i2c_new_device(adap, &info);
> + if (result == NULL) {
> + dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
> + node->full_name);
> + of_node_put(node);
> + irq_dispose_mapping(info.irq);
> + continue;
> + }
> + }
> +}
> +#else
> +static inline void i2c_scan_of_devices(struct i2c_adapter *adap) { }
> +#endif
Is there any advantage to just making the definition in the header
file a static inline and removing the #else part of this?
--
Ben
Q: What's a light-year?
A: One-third less calories than a regular year.
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
