[PATCH v4 2/6] power: add power sequence library
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From: mka@chromium.org (Matthias Kaehlcke)
Date: 2016-08-03 22:17:44
Also in:
linux-devicetree, linux-pm, lkml
El Tue, Aug 02, 2016 at 11:30:48AM +0800 Peter Chen ha dit:
quoted hunk ↗ jump to hunk
diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c... +static DEFINE_MUTEX(pwrseq_list_mutex); +static LIST_HEAD(pwrseq_list); + +int pwrseq_get(struct device_node *np, struct pwrseq *p) +{ + if (p && p->get) + return p->get(np, p); + + return -ENOTSUPP; +} + +int pwrseq_on(struct device_node *np, struct pwrseq *p) +{ + if (p && p->on) + return p->on(np, p); + + return -ENOTSUPP; +} + +void pwrseq_off(struct pwrseq *p) +{ + if (p && p->off) + p->off(p); +} + +void pwrseq_put(struct pwrseq *p) +{ + if (p && p->put) + p->put(p); +} + +void pwrseq_free(struct pwrseq *p) +{ + if (p && p->free) + p->free(p); +} + +void pwrseq_register(struct pwrseq *pwrseq) +{ + mutex_lock(&pwrseq_list_mutex); + list_add(&pwrseq->node, &pwrseq_list); + mutex_unlock(&pwrseq_list_mutex); +} + +void pwrseq_unregister(struct pwrseq *pwrseq) +{ + mutex_lock(&pwrseq_list_mutex); + list_del(&pwrseq->node); + mutex_unlock(&pwrseq_list_mutex); +}
What is the purpose of pwrseq_register/unregister()? The pwrseq structs are added and removed from pwrseq_list, but besides that pwrseq_list is not used. Looks like this is a remainder from the ancestor of this code (drivers/mmc/core/pwrseq.c) which uses the list to avoid having multiple pwrseq instances for the same device. Matthias