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soc: mediatek: SCPSYS: Add regulator support 

The power domains are supplied by regulators. Add support for them so
that the regulators are properly turned on before a domain is powered up
and turned off when a domain is powered down.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
This commit is contained in:
Sascha Hauer 2015-11-30 11:41:40 +01:00 committed by Matthias Brugger
parent 8005c49d9a
commit 4688f3856d
1 changed files with 27 additions and 0 deletions
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27
drivers/soc/mediatek/mtk-scpsys.c
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@ -21,6 +21,7 @@
#include <linux/pm_domain.h>
#include <linux/regmap.h>
#include <linux/soc/mediatek/infracfg.h>
#include <linux/regulator/consumer.h>
#include <dt-bindings/power/mt8173-power.h>
#define SPM_VDE_PWR_CON 0x0210
@ -179,6 +180,7 @@ struct scp_domain {
u32 sram_pdn_ack_bits;
u32 bus_prot_mask;
bool active_wakeup;
struct regulator *supply;
};
struct scp {
@ -221,6 +223,12 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
int ret;
int i;
if (scpd->supply) {
ret = regulator_enable(scpd->supply);
if (ret)
return ret;
}
for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++) {
ret = clk_prepare_enable(scpd->clk[i]);
if (ret) {
@ -299,6 +307,9 @@ err_pwr_ack:
clk_disable_unprepare(scpd->clk[i]);
}
err_clk:
if (scpd->supply)
regulator_disable(scpd->supply);
dev_err(scp->dev, "Failed to power on domain %s\n", genpd->name);
return ret;
@ -379,6 +390,9 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++)
clk_disable_unprepare(scpd->clk[i]);
if (scpd->supply)
regulator_disable(scpd->supply);
return 0;
out:
@ -448,6 +462,19 @@ static int __init scpsys_probe(struct platform_device *pdev)
return PTR_ERR(scp->infracfg);
}
for (i = 0; i < NUM_DOMAINS; i++) {
struct scp_domain *scpd = &scp->domains[i];
const struct scp_domain_data *data = &scp_domain_data[i];
scpd->supply = devm_regulator_get_optional(&pdev->dev, data->name);
if (IS_ERR(scpd->supply)) {
if (PTR_ERR(scpd->supply) == -ENODEV)
scpd->supply = NULL;
else
return PTR_ERR(scpd->supply);
}
}
pd_data->num_domains = NUM_DOMAINS;
for (i = 0; i < NUM_DOMAINS; i++) {