dm: power: domain: add BCM6328 power domain driver

This allows controlling MISC IDDQ register on BCM6328 SoCs.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

drivers/power/domain/Kconfig

@@ -9,6 +9,13 @@ config POWER_DOMAIN
 	  domains). This may be used to save power. This API provides the
 	  means to control such power management hardware.
 
+config BCM6328_POWER_DOMAIN
+	bool "Enable the BCM6328 power domain driver"
+	depends on POWER_DOMAIN && ARCH_BMIPS
+	help
+	  Enable support for manipulating BCM6345 power domains via MMIO
+	  mapped registers.
+
 config SANDBOX_POWER_DOMAIN
 	bool "Enable the sandbox power domain test driver"
 	depends on POWER_DOMAIN && SANDBOX

drivers/power/domain/Makefile

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_POWER_DOMAIN) += power-domain-uclass.o
+obj-$(CONFIG_BCM6328_POWER_DOMAIN) += bcm6328-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
 obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o

drivers/power/domain/bcm6328-power-domain.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <power-domain-uclass.h>
+#include <asm/io.h>
+
+#define MAX_DOMAINS	32
+
+struct bcm6328_power_domain {
+	void __iomem *regs;
+};
+
+static int bcm6328_power_domain_request(struct power_domain *power_domain)
+{
+	if (power_domain->id >= MAX_DOMAINS)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int bcm6328_power_domain_free(struct power_domain *power_domain)
+{
+	return 0;
+}
+
+static int bcm6328_power_domain_on(struct power_domain *power_domain)
+{
+	struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
+
+	clrbits_be32(priv->regs, BIT(power_domain->id));
+
+	return 0;
+}
+
+static int bcm6328_power_domain_off(struct power_domain *power_domain)
+{
+	struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
+
+	setbits_be32(priv->regs, BIT(power_domain->id));
+
+	return 0;
+}
+
+static int bcm6328_power_domain_probe(struct udevice *dev)
+{
+	struct bcm6328_power_domain *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+	fdt_size_t size;
+
+	addr = dev_get_addr_size_index(dev, 0, &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->regs = ioremap(addr, size);
+
+	return 0;
+}
+
+static const struct udevice_id bcm6328_power_domain_ids[] = {
+	{ .compatible = "brcm,bcm6328-power-domain" },
+	{ /* sentinel */ }
+};
+
+struct power_domain_ops bcm6328_power_domain_ops = {
+	.free = bcm6328_power_domain_free,
+	.off = bcm6328_power_domain_off,
+	.on = bcm6328_power_domain_on,
+	.request = bcm6328_power_domain_request,
+};
+
+U_BOOT_DRIVER(bcm6328_power_domain) = {
+	.name = "bcm6328_power_domain",
+	.id = UCLASS_POWER_DOMAIN,
+	.of_match = bcm6328_power_domain_ids,
+	.ops = &bcm6328_power_domain_ops,
+	.priv_auto_alloc_size = sizeof(struct bcm6328_power_domain),
+	.probe = bcm6328_power_domain_probe,
+};