On 30.07.22 11:52, Ahmad Fatoum wrote:
> With deep probe enabled, we can know for certain whether a driver will
> be found for a device or not. This allows us to specially handle devices
> that lack a driver. We already do that for regulators, where the device
> tree can specify barebox,allow-dummy-supply for regulators that are
> known to be enabled by the time barebox runs. Add the same functionality
> for power domains as well.
>
> Signed-off-by: Ahmad Fatoum <[email protected]>
> ---
Please dismiss, sending out v2 shortly.
> drivers/base/power.c | 24 +++++++++++++++++++++---
> 1 file changed, 21 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/power.c b/drivers/base/power.c
> index 96cac1a091f3..4a206051b137 100644
> --- a/drivers/base/power.c
> +++ b/drivers/base/power.c
> @@ -139,14 +139,32 @@ static struct generic_pm_domain
> *genpd_get_from_provider(
> struct of_phandle_args *genpdspec)
> {
> struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
> + struct device_node *node = genpdspec->np;
> struct of_genpd_provider *provider;
> + int ret;
>
> if (!genpdspec)
> return ERR_PTR(-EINVAL);
>
> + ret = of_device_ensure_probed(node);
> + if (ret) {
> + struct device_node *parent;
> +
> + /*
> + * If "barebox,allow-dummy" property is set for power domain
> + * provider, assume it's turned on.
> + */
> + parent = of_get_parent(node);
> + if (of_get_property(node, "barebox,allow-dummy", NULL) ||
> + of_get_property(parent, "barebox,allow-dummy", NULL))
> + return NULL;
> +
> + return ERR_PTR(ret);
> + }
> +
> /* Check if we have such a provider in our array */
> list_for_each_entry(provider, &of_genpd_providers, link) {
> - if (provider->node == genpdspec->np)
> + if (provider->node == node)
> genpd = provider->xlate(genpdspec, provider->data);
> if (!IS_ERR(genpd))
> break;
> @@ -175,7 +193,7 @@ static int genpd_power_on(struct generic_pm_domain
> *genpd, unsigned int depth)
> {
> int ret;
>
> - if (genpd_status_on(genpd))
> + if (!genpd || genpd_status_on(genpd))
> return 0;
>
> ret = _genpd_power_on(genpd, true);
> @@ -211,7 +229,7 @@ static int __genpd_dev_pm_attach(struct device_d *dev,
> struct device_node *np,
> return (ret == -ENOENT) ? -EPROBE_DEFER : ret;
> }
>
> - dev_dbg(dev, "adding to PM domain %s\n", pd->name);
> + dev_dbg(dev, "adding to PM domain %s\n", pd ? pd->name : "dummy");
>
> if (power_on)
> ret = genpd_power_on(pd, 0);
--
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