drm/panfrost: Add support for multiple regulators

Some GPUs, namely, the bifrost/g72 part on MT8183, have a second
regulator for their SRAM, let's add support for that.

We extend the framework in a generic manner so that we could
support more than 2 regulators, if required.

Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviwed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200207052627.130118-5-drinkcat@chromium.org

drivers/gpu/drm/panfrost/panfrost_device.c

@@ -87,18 +87,27 @@ static void panfrost_clk_fini(struct panfrost_device *pfdev)
 
 static int panfrost_regulator_init(struct panfrost_device *pfdev)
 {
-	int ret;
+	int ret, i;
 
-	pfdev->regulator = devm_regulator_get(pfdev->dev, "mali");
-	if (IS_ERR(pfdev->regulator)) {
-		ret = PTR_ERR(pfdev->regulator);
-		dev_err(pfdev->dev, "failed to get regulator: %d\n", ret);
+	if (WARN(pfdev->comp->num_supplies > ARRAY_SIZE(pfdev->regulators),
+			"Too many supplies in compatible structure.\n"))
+		return -EINVAL;
+
+	for (i = 0; i < pfdev->comp->num_supplies; i++)
+		pfdev->regulators[i].supply = pfdev->comp->supply_names[i];
+
+	ret = devm_regulator_bulk_get(pfdev->dev,
+				      pfdev->comp->num_supplies,
+				      pfdev->regulators);
+	if (ret < 0) {
+		dev_err(pfdev->dev, "failed to get regulators: %d\n", ret);
 		return ret;
 	}
 
-	ret = regulator_enable(pfdev->regulator);
+	ret = regulator_bulk_enable(pfdev->comp->num_supplies,
+				    pfdev->regulators);
 	if (ret < 0) {
-		dev_err(pfdev->dev, "failed to enable regulator: %d\n", ret);
+		dev_err(pfdev->dev, "failed to enable regulators: %d\n", ret);
 		return ret;
 	}
 
@@ -107,7 +116,8 @@ static int panfrost_regulator_init(struct panfrost_device *pfdev)
 
 static void panfrost_regulator_fini(struct panfrost_device *pfdev)
 {
-	regulator_disable(pfdev->regulator);
+	regulator_bulk_disable(pfdev->comp->num_supplies,
+			pfdev->regulators);
 }
 
 int panfrost_device_init(struct panfrost_device *pfdev)

drivers/gpu/drm/panfrost/panfrost_device.h

@@ -7,6 +7,7 @@
 
 #include <linux/atomic.h>
 #include <linux/io-pgtable.h>
+#include <linux/regulator/consumer.h>
 #include <linux/spinlock.h>
 #include <drm/drm_device.h>
 #include <drm/drm_mm.h>
@@ -19,6 +20,7 @@ struct panfrost_job;
 struct panfrost_perfcnt;
 
 #define NUM_JOB_SLOTS 3
+#define MAX_REGULATORS 2
 
 struct panfrost_features {
 	u16 id;
@@ -51,6 +53,16 @@ struct panfrost_features {
 	unsigned long hw_issues[64 / BITS_PER_LONG];
 };
 
+/*
+ * Features that cannot be automatically detected and need matching using the
+ * compatible string, typically SoC-specific.
+ */
+struct panfrost_compatible {
+	/* Supplies count and names. */
+	int num_supplies;
+	const char * const *supply_names;
+};
+
 struct panfrost_device {
 	struct device *dev;
 	struct drm_device *ddev;
@@ -59,10 +71,11 @@ struct panfrost_device {
 	void __iomem *iomem;
 	struct clk *clock;
 	struct clk *bus_clock;
-	struct regulator *regulator;
+	struct regulator_bulk_data regulators[MAX_REGULATORS];
 	struct reset_control *rstc;
 
 	struct panfrost_features features;
+	const struct panfrost_compatible *comp;
 
 	spinlock_t as_lock;
 	unsigned long as_in_use_mask;

drivers/gpu/drm/panfrost/panfrost_drv.c

@@ -584,6 +584,10 @@ static int panfrost_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pfdev);
 
+	pfdev->comp = of_device_get_match_data(&pdev->dev);
+	if (!pfdev->comp)
+		return -ENODEV;
+
 	/* Allocate and initialze the DRM device. */
 	ddev = drm_dev_alloc(&panfrost_drm_driver, &pdev->dev);
 	if (IS_ERR(ddev))
@@ -655,16 +659,22 @@ static int panfrost_remove(struct platform_device *pdev)
 	return 0;
 }
 
+const char * const default_supplies[] = { "mali" };
+static const struct panfrost_compatible default_data = {
+	.num_supplies = ARRAY_SIZE(default_supplies),
+	.supply_names = default_supplies,
+};
+
 static const struct of_device_id dt_match[] = {
-	{ .compatible = "arm,mali-t604" },
-	{ .compatible = "arm,mali-t624" },
-	{ .compatible = "arm,mali-t628" },
-	{ .compatible = "arm,mali-t720" },
-	{ .compatible = "arm,mali-t760" },
-	{ .compatible = "arm,mali-t820" },
-	{ .compatible = "arm,mali-t830" },
-	{ .compatible = "arm,mali-t860" },
-	{ .compatible = "arm,mali-t880" },
+	{ .compatible = "arm,mali-t604", .data = &default_data, },
+	{ .compatible = "arm,mali-t624", .data = &default_data, },
+	{ .compatible = "arm,mali-t628", .data = &default_data, },
+	{ .compatible = "arm,mali-t720", .data = &default_data, },
+	{ .compatible = "arm,mali-t760", .data = &default_data, },
+	{ .compatible = "arm,mali-t820", .data = &default_data, },
+	{ .compatible = "arm,mali-t830", .data = &default_data, },
+	{ .compatible = "arm,mali-t860", .data = &default_data, },
+	{ .compatible = "arm,mali-t880", .data = &default_data, },
 	{}
 };
 MODULE_DEVICE_TABLE(of, dt_match);