[PATCH v4 09/14] drm/panfrost: dynamically alloc regulators

[Clément Péron]

We will later introduce regulators managed by OPP.

Only alloc regulators when it's needed. This also help use
to release the regulators only when they are allocated.

Reviewed-by: Steven Price <steven.pr...@arm.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzw...@collabora.com>
Signed-off-by: Clément Péron <peron.c...@gmail.com>
---
 drivers/gpu/drm/panfrost/panfrost_device.c | 14 +++++++++-----
 drivers/gpu/drm/panfrost/panfrost_device.h |  3 +--
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c 
b/drivers/gpu/drm/panfrost/panfrost_device.c
index 36b5c8fea3eb..f1474b961def 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -90,9 +90,11 @@ static int panfrost_regulator_init(struct panfrost_device 
*pfdev)
 {
        int ret, i;
 
-       if (WARN(pfdev->comp->num_supplies > ARRAY_SIZE(pfdev->regulators),
-                       "Too many supplies in compatible structure.\n"))
-               return -EINVAL;
+       pfdev->regulators = devm_kcalloc(pfdev->dev, pfdev->comp->num_supplies,
+                                        sizeof(*pfdev->regulators),
+                                        GFP_KERNEL);
+       if (!pfdev->regulators)
+               return -ENOMEM;
 
        for (i = 0; i < pfdev->comp->num_supplies; i++)
                pfdev->regulators[i].supply = pfdev->comp->supply_names[i];
@@ -119,8 +121,10 @@ static int panfrost_regulator_init(struct panfrost_device 
*pfdev)
 
 static void panfrost_regulator_fini(struct panfrost_device *pfdev)
 {
-       regulator_bulk_disable(pfdev->comp->num_supplies,
-                       pfdev->regulators);
+       if (!pfdev->regulators)
+               return;
+
+       regulator_bulk_disable(pfdev->comp->num_supplies, pfdev->regulators);
 }
 
 static void panfrost_pm_domain_fini(struct panfrost_device *pfdev)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h 
b/drivers/gpu/drm/panfrost/panfrost_device.h
index 2efa59c9d1c5..953f7536a773 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -22,7 +22,6 @@ struct panfrost_job;
 struct panfrost_perfcnt;
 
 #define NUM_JOB_SLOTS 3
-#define MAX_REGULATORS 2
 #define MAX_PM_DOMAINS 3
 
 struct panfrost_features {
@@ -81,7 +80,7 @@ struct panfrost_device {
        void __iomem *iomem;
        struct clk *clock;
        struct clk *bus_clock;
-       struct regulator_bulk_data regulators[MAX_REGULATORS];
+       struct regulator_bulk_data *regulators;
        struct reset_control *rstc;
        /* pm_domains for devices with more than one. */
        struct device *pm_domain_devs[MAX_PM_DOMAINS];
-- 
2.25.1