clk: Add Fixed MMIO clock driver

This patch adds a driver for Fixed MMIO clock.
The driver reads a clock frequency value from a single 32-bit memory
mapped register and registers it as a fixed rate clock.

It can be enabled with COMMON_CLK_FIXED_MMIO Kconfig option.

Signed-off-by: Jan Kotas <jank@cadence.com>
[sboyd@kernel.org: Make of_fixed_mmio_clk_setup() static, use clk_hw
based APIs]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

3 files changed, 108 insertions, 0 deletions

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index e5b2fe80eab4..296972518db4 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -290,6 +290,12 @@ config COMMON_CLK_BD718XX
           This driver supports ROHM BD71837 and ROHM BD71847
           PMICs clock gates.
 
+config COMMON_CLK_FIXED_MMIO
+        bool "Clock driver for Memory Mapped Fixed values"
+        depends on COMMON_CLK && OF
+        help
+          Support for Memory Mapped IO Fixed clocks
+
 source "drivers/clk/actions/Kconfig"
 source "drivers/clk/bcm/Kconfig"
 source "drivers/clk/hisilicon/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 8a9440a97500..d6cd32bda771 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_COMMON_CLK_CDCE925)	+= clk-cdce925.o
 obj-$(CONFIG_ARCH_CLPS711X)             += clk-clps711x.o
 obj-$(CONFIG_COMMON_CLK_CS2000_CP)      += clk-cs2000-cp.o
 obj-$(CONFIG_ARCH_EFM32)                += clk-efm32gg.o
+obj-$(CONFIG_COMMON_CLK_FIXED_MMIO)     += clk-fixed-mmio.o
 obj-$(CONFIG_COMMON_CLK_GEMINI)         += clk-gemini.o
 obj-$(CONFIG_COMMON_CLK_ASPEED)         += clk-aspeed.o
 obj-$(CONFIG_ARCH_HIGHBANK)             += clk-highbank.o
diff --git a/drivers/clk/clk-fixed-mmio.c b/drivers/clk/clk-fixed-mmio.c
new file mode 100644
index 000000000000..d1a97d971183
--- /dev/null
+++ b/drivers/clk/clk-fixed-mmio.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Memory Mapped IO Fixed clock driver
+ *
+ * Copyright (C) 2018 Cadence Design Systems, Inc.
+ *
+ * Authors:
+ *      Jan Kotas <jank@cadence.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/of_address.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+static struct clk_hw *fixed_mmio_clk_setup(struct device_node *node)
+{
+        struct clk_hw *clk;
+        const char *clk_name = node->name;
+        void __iomem *base;
+        u32 freq;
+        int ret;
+
+        base = of_iomap(node, 0);
+        if (!base) {
+                pr_err("%pOFn: failed to map address\n", node);
+                return ERR_PTR(-EIO);
+        }
+
+        freq = readl(base);
+        iounmap(base);
+        of_property_read_string(node, "clock-output-names", &clk_name);
+
+        clk = clk_hw_register_fixed_rate(NULL, clk_name, NULL, 0, freq);
+        if (IS_ERR(clk)) {
+                pr_err("%pOFn: failed to register fixed rate clock\n", node);
+                return clk;
+        }
+
+        ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, clk);
+        if (ret) {
+                pr_err("%pOFn: failed to add clock provider\n", node);
+                clk_hw_unregister(clk);
+                clk = ERR_PTR(ret);
+        }
+
+        return clk;
+}
+
+static void __init of_fixed_mmio_clk_setup(struct device_node *node)
+{
+        fixed_mmio_clk_setup(node);
+}
+CLK_OF_DECLARE(fixed_mmio_clk, "fixed-mmio-clock", of_fixed_mmio_clk_setup);
+
+/**
+ * This is not executed when of_fixed_mmio_clk_setup succeeded.
+ */
+static int of_fixed_mmio_clk_probe(struct platform_device *pdev)
+{
+        struct clk_hw *clk;
+
+        clk = fixed_mmio_clk_setup(pdev->dev.of_node);
+        if (IS_ERR(clk))
+                return PTR_ERR(clk);
+
+        platform_set_drvdata(pdev, clk);
+
+        return 0;
+}
+
+static int of_fixed_mmio_clk_remove(struct platform_device *pdev)
+{
+        struct clk_hw *clk = platform_get_drvdata(pdev);
+
+        of_clk_del_provider(pdev->dev.of_node);
+        clk_hw_unregister_fixed_rate(clk);
+
+        return 0;
+}
+
+static const struct of_device_id of_fixed_mmio_clk_ids[] = {
+        { .compatible = "fixed-mmio-clock" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, of_fixed_mmio_clk_ids);
+
+static struct platform_driver of_fixed_mmio_clk_driver = {
+        .driver = {
+                .name = "of_fixed_mmio_clk",
+                .of_match_table = of_fixed_mmio_clk_ids,
+        },
+        .probe = of_fixed_mmio_clk_probe,
+        .remove = of_fixed_mmio_clk_remove,
+};
+module_platform_driver(of_fixed_mmio_clk_driver);
+
+MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
+MODULE_DESCRIPTION("Memory Mapped IO Fixed clock driver");
+MODULE_LICENSE("GPL v2");