lkml.org 
[lkml]   [2011]   [Jun]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 4/5] dt: add of_platform_populate() for creating device from the device tree
Grant,

This is a bit old, but my testing has uncovered a few issues.

On 03/16/2011 03:33 AM, Grant Likely wrote:
> of_platform_populate() is similar to of_platform_bus_probe() except
> that it strictly enforces that all device nodes must have a compatible
> property, and it can be used to register devices (not buses) which are
> children of the root node.
>
> This patch also modifies MPC5200 support to use the new function.
>
> Signed-off-by: Grant Likely<grant.likely@secretlab.ca>
> ---
> arch/powerpc/platforms/52xx/mpc52xx_common.c | 10 ++---
> drivers/of/platform.c | 54 ++++++++++++++++++++++++--
> include/linux/of_platform.h | 3 +
> 3 files changed, 57 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c
> index 41f3a7e..5767a8a 100644
> --- a/arch/powerpc/platforms/52xx/mpc52xx_common.c
> +++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c
> @@ -97,13 +97,11 @@ struct mpc52xx_gpio_wkup __iomem *wkup_gpio;
> * of the localplus bus to the of_platform
> * bus.
> */
> -void __init
> -mpc52xx_declare_of_platform_devices(void)
> +void __init mpc52xx_declare_of_platform_devices(void)
> {
> - /* Find every child of the SOC node and add it to of_platform */
> - if (of_platform_bus_probe(NULL, mpc52xx_bus_ids, NULL))
> - printk(KERN_ERR __FILE__ ": "
> - "Error while probing of_platform bus\n");
> + /* Find all the 'platform' devices and register them. */
> + if (of_platform_populate(NULL, mpc52xx_bus_ids, NULL))
> + pr_err(__FILE__ ": Error while populating devices from DT\n");
> }
>
> /*
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index 63d3cb7..9b785be 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -221,19 +221,26 @@ EXPORT_SYMBOL(of_platform_device_create);
> */
> static int of_platform_bus_create(struct device_node *bus,
> const struct of_device_id *matches,
> - struct device *parent)
> + struct device *parent, bool strict)
> {
> struct device_node *child;
> struct platform_device *dev;
> int rc = 0;
>
> + /* Make sure it has a compatible property */
> + if (strict&& (!of_get_property(bus, "compatible", NULL))) {
> + pr_debug("%s() - skipping %s, no compatible prop\n",
> + __func__, bus->full_name);
> + return 0;
> + }
> +
> dev = of_platform_device_create(bus, NULL, parent);
> if (!dev || !of_match_node(matches, bus))
> return 0;
>
> for_each_child_of_node(bus, child) {
> pr_debug(" create child: %s\n", child->full_name);
> - rc = of_platform_bus_create(child, matches,&dev->dev);
> + rc = of_platform_bus_create(child, matches,&dev->dev, strict);
> if (rc) {
> of_node_put(child);
> break;
> @@ -267,11 +274,11 @@ int of_platform_bus_probe(struct device_node *root,
>
> /* Do a self check of bus type, if there's a match, create children */
> if (of_match_node(matches, root)) {
> - rc = of_platform_bus_create(root, matches, parent);
> + rc = of_platform_bus_create(root, matches, parent, false);
> } else for_each_child_of_node(root, child) {
> if (!of_match_node(matches, child))
> continue;
> - rc = of_platform_bus_create(child, matches, parent);
> + rc = of_platform_bus_create(child, matches, parent, false);
> if (rc)
> break;
> }
> @@ -280,4 +287,43 @@ int of_platform_bus_probe(struct device_node *root,
> return rc;
> }
> EXPORT_SYMBOL(of_platform_bus_probe);
> +
> +/**
> + * of_platform_populate() - Populate platform_devices from device tree data
> + * @root: parent of the first level to probe or NULL for the root of the tree
> + * @matches: match table, NULL to use the default
> + * @parent: parent to hook devices from, NULL for toplevel
> + *
> + * Similar to of_platform_bus_probe(), this function walks the device tree
> + * and creates devices from nodes. It differs in that it follows the modern
> + * convention of requiring all device nodes to have a 'compatible' property,
> + * and it is suitable for creating devices which are children of the root
> + * node (of_platform_bus_probe will only create children of the root which
> + * are selected by the @matches argument).
> + *
> + * New board support should be using this function instead of
> + * of_platform_bus_probe().
> + *
> + * Returns 0 on success,< 0 on failure.
> + */
> +int of_platform_populate(struct device_node *root,
> + const struct of_device_id *matches,
> + struct device *parent)
> +{
> + struct device_node *child;
> + int rc = 0;
> +
> + root = root ? of_node_get(root) : of_find_node_by_path("/");
> + if (!root)
> + return -EINVAL;
> +
> + for_each_child_of_node(root, child) {

This needs a check of of_match_node. Otherwise, a device is created for
all top level nodes, not just the matching node.

if (!of_match_node(matches, child))
continue;

> + rc = of_platform_bus_create(child, matches, parent, true);
> + if (rc)
> + break;
> + }
> +
> + of_node_put(root);
> + return rc;
> +}

Missing EXPORT_SYMBOL.

Since this is only in next, do you want to fix it or I can submit a patch.

Rob


\
 
 \ /
  Last update: 2011-06-08 16:23    [W:0.819 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site