ARM: ux500: Move power-domain driver to the genpd dir

To simplify with maintenance let's move the ux500 power-domain driver to
the new genpd directory. Going forward, patches are intended to be managed
through a separate git tree, according to MAINTAINERS.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

3 files changed, 97 insertions, 0 deletions

diff --git a/drivers/genpd/Makefile b/drivers/genpd/Makefile
index efd955f586e9..c429485c13f6 100644
--- a/drivers/genpd/Makefile
+++ b/drivers/genpd/Makefile
@@ -8,6 +8,7 @@ obj-y					+= qcom/
 obj-y					+= renesas/
 obj-y					+= rockchip/
 obj-y					+= samsung/
+obj-y					+= st/
 obj-y					+= starfive/
 obj-y					+= sunxi/
 obj-y					+= tegra/
diff --git a/drivers/genpd/st/Makefile b/drivers/genpd/st/Makefile
new file mode 100644
index 000000000000..8fa5f9855460
--- /dev/null
+++ b/drivers/genpd/st/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ARCH_U8500)		+= ste-ux500-pm-domain.o
diff --git a/drivers/genpd/st/ste-ux500-pm-domain.c b/drivers/genpd/st/ste-ux500-pm-domain.c
new file mode 100644
index 000000000000..3d4f111ed156
--- /dev/null
+++ b/drivers/genpd/st/ste-ux500-pm-domain.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ *
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ * Implements PM domains using the generic PM domain for ux500.
+ */
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/pm_domain.h>
+
+#include <dt-bindings/arm/ux500_pm_domains.h>
+
+static int pd_power_off(struct generic_pm_domain *domain)
+{
+	/*
+	 * Handle the gating of the PM domain regulator here.
+	 *
+	 * Drivers/subsystems handling devices in the PM domain needs to perform
+	 * register context save/restore from their respective runtime PM
+	 * callbacks, to be able to enable PM domain gating/ungating.
+	 */
+	return 0;
+}
+
+static int pd_power_on(struct generic_pm_domain *domain)
+{
+	/*
+	 * Handle the ungating of the PM domain regulator here.
+	 *
+	 * Drivers/subsystems handling devices in the PM domain needs to perform
+	 * register context save/restore from their respective runtime PM
+	 * callbacks, to be able to enable PM domain gating/ungating.
+	 */
+	return 0;
+}
+
+static struct generic_pm_domain ux500_pm_domain_vape = {
+	.name = "VAPE",
+	.power_off = pd_power_off,
+	.power_on = pd_power_on,
+};
+
+static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
+	[DOMAIN_VAPE] = &ux500_pm_domain_vape,
+};
+
+static const struct of_device_id ux500_pm_domain_matches[] = {
+	{ .compatible = "stericsson,ux500-pm-domains", },
+	{ },
+};
+
+static int ux500_pm_domains_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct genpd_onecell_data *genpd_data;
+	int i;
+
+	if (!np)
+		return -ENODEV;
+
+	genpd_data = kzalloc(sizeof(*genpd_data), GFP_KERNEL);
+	if (!genpd_data)
+		return -ENOMEM;
+
+	genpd_data->domains = ux500_pm_domains;
+	genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);
+
+	for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)
+		pm_genpd_init(ux500_pm_domains[i], NULL, false);
+
+	of_genpd_add_provider_onecell(np, genpd_data);
+	return 0;
+}
+
+static struct platform_driver ux500_pm_domains_driver = {
+	.probe  = ux500_pm_domains_probe,
+	.driver = {
+		.name = "ux500_pm_domains",
+		.of_match_table = ux500_pm_domain_matches,
+	},
+};
+
+static int __init ux500_pm_domains_init(void)
+{
+	return platform_driver_register(&ux500_pm_domains_driver);
+}
+arch_initcall(ux500_pm_domains_init);