dm: clk: add BCM6345 clock driver

This is a simplified version of linux/arch/mips/bcm63xx/clk.c
Signed-off-by: NÁlvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/clk/Kconfig

@@ -20,6 +20,14 @@ config SPL_CLK
 	  setting up clocks within SPL, and allows the same drivers to be
 	  used as U-Boot proper.
 
+config CLK_BCM6345
+	bool "Clock controller driver for BCM6345"
+	depends on CLK && ARCH_BMIPS
+	default y
+	help
+	  This clock driver adds support for enabling and disabling peripheral
+	  clocks on BCM6345 SoCs. HW has no rate changing capabilities.
+
 config CLK_BOSTON
 	def_bool y if TARGET_BOSTON
 	depends on CLK

drivers/clk/Makefile

@@ -17,6 +17,7 @@ obj-y += tegra/
 obj-$(CONFIG_CLK_UNIPHIER) += uniphier/
 obj-$(CONFIG_CLK_EXYNOS) += exynos/
 obj-$(CONFIG_CLK_AT91) += at91/
+obj-$(CONFIG_CLK_BCM6345) += clk_bcm6345.o
 obj-$(CONFIG_CLK_BOSTON) += clk_boston.o
 obj-$(CONFIG_ARCH_ASPEED) += aspeed/
 obj-$(CONFIG_STM32F7) += clk_stm32f7.o

drivers/clk/clk_bcm6345.c

+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/arch/mips/bcm63xx/clk.c:
+ *	Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <asm/io.h>
+
+#define MAX_CLKS	32
+
+struct bcm6345_clk_priv {
+	void __iomem *regs;
+};
+
+static int bcm6345_clk_enable(struct clk *clk)
+{
+	struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
+
+	if (clk->id >= MAX_CLKS)
+		return -EINVAL;
+
+	setbits_be32(priv->regs, BIT(clk->id));
+
+	return 0;
+}
+
+static int bcm6345_clk_disable(struct clk *clk)
+{
+	struct bcm6345_clk_priv *priv = dev_get_priv(clk->dev);
+
+	if (clk->id >= MAX_CLKS)
+		return -EINVAL;
+
+	clrbits_be32(priv->regs, BIT(clk->id));
+
+	return 0;
+}
+
+static struct clk_ops bcm6345_clk_ops = {
+	.disable = bcm6345_clk_disable,
+	.enable = bcm6345_clk_enable,
+};
+
+static const struct udevice_id bcm6345_clk_ids[] = {
+	{ .compatible = "brcm,bcm6345-clk" },
+	{ /* sentinel */ }
+};
+
+static int bcm63xx_clk_probe(struct udevice *dev)
+{
+	struct bcm6345_clk_priv *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;
+}
+
+U_BOOT_DRIVER(clk_bcm6345) = {
+	.name = "clk_bcm6345",
+	.id = UCLASS_CLK,
+	.of_match = bcm6345_clk_ids,
+	.ops = &bcm6345_clk_ops,
+	.probe = bcm63xx_clk_probe,
+	.priv_auto_alloc_size = sizeof(struct bcm6345_clk_priv),
+};