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>

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 4d4203c896c40e71486dd27e60e0918071c1e0ae..e4256190bab5dd964764c940a1fcc10438bd04ab 100644 (file)
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -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++) {