mfd: Add support for sun6i PRCM (Power/Reset/Clock Management) unit

The PRCM (Power/Reset/Clock Management) block exposes several subdevices
in different subsystems (clk, reset ...)

Add basic support for the PRCM unit with clk (AR100, AHB0, and APB0 clks)
and reset controller subdevices.

Other subdevices might be added later (if needed).

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 143 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index c681741ce492..e56fb3749bca 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -732,6 +732,14 @@ config MFD_STA2X11
         select MFD_CORE
         select REGMAP_MMIO
 
+config MFD_SUN6I_PRCM
+        bool "Allwinner A31 PRCM controller"
+        depends on ARCH_SUNXI
+        select MFD_CORE
+        help
+          Support for the PRCM (Power/Reset/Clock Management) unit available
+          in A31 SoC.
+
 config MFD_SYSCON
         bool "System Controller Register R/W Based on Regmap"
         select REGMAP_MMIO
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 1efecf2793ae..df7823cae5af 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_MFD_STA2X11)	+= sta2x11-mfd.o
 obj-$(CONFIG_MFD_STMPE)         += stmpe.o
 obj-$(CONFIG_STMPE_I2C)         += stmpe-i2c.o
 obj-$(CONFIG_STMPE_SPI)         += stmpe-spi.o
+obj-$(CONFIG_MFD_SUN6I_PRCM)    += sun6i-prcm.o
 obj-$(CONFIG_MFD_TC3589X)       += tc3589x.o
 obj-$(CONFIG_MFD_T7L66XB)       += t7l66xb.o tmio_core.o
 obj-$(CONFIG_MFD_TC6387XB)      += tc6387xb.o tmio_core.o
diff --git a/drivers/mfd/sun6i-prcm.c b/drivers/mfd/sun6i-prcm.c
new file mode 100644
index 000000000000..718fc4d2adc0
--- /dev/null
+++ b/drivers/mfd/sun6i-prcm.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * Allwinner PRCM (Power/Reset/Clock Management) driver
+ *
+ */
+
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+struct prcm_data {
+        int nsubdevs;
+        const struct mfd_cell *subdevs;
+};
+
+static const struct resource sun6i_a31_ar100_clk_res[] = {
+        {
+                .start = 0x0,
+                .end = 0x3,
+                .flags = IORESOURCE_MEM,
+        },
+};
+
+static const struct resource sun6i_a31_apb0_clk_res[] = {
+        {
+                .start = 0xc,
+                .end = 0xf,
+                .flags = IORESOURCE_MEM,
+        },
+};
+
+static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
+        {
+                .start = 0x28,
+                .end = 0x2b,
+                .flags = IORESOURCE_MEM,
+        },
+};
+
+static const struct resource sun6i_a31_apb0_rstc_res[] = {
+        {
+                .start = 0xb0,
+                .end = 0xb3,
+                .flags = IORESOURCE_MEM,
+        },
+};
+
+static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
+        {
+                .name = "sun6i-a31-ar100-clk",
+                .of_compatible = "allwinner,sun6i-a31-ar100-clk",
+                .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
+                .resources = sun6i_a31_ar100_clk_res,
+        },
+        {
+                .name = "sun6i-a31-apb0-clk",
+                .of_compatible = "allwinner,sun6i-a31-apb0-clk",
+                .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
+                .resources = sun6i_a31_apb0_clk_res,
+        },
+        {
+                .name = "sun6i-a31-apb0-gates-clk",
+                .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
+                .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
+                .resources = sun6i_a31_apb0_gates_clk_res,
+        },
+        {
+                .name = "sun6i-a31-apb0-clock-reset",
+                .of_compatible = "allwinner,sun6i-a31-clock-reset",
+                .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
+                .resources = sun6i_a31_apb0_rstc_res,
+        },
+};
+
+static const struct prcm_data sun6i_a31_prcm_data = {
+        .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
+        .subdevs = sun6i_a31_prcm_subdevs,
+};
+
+static const struct of_device_id sun6i_prcm_dt_ids[] = {
+        {
+                .compatible = "allwinner,sun6i-a31-prcm",
+                .data = &sun6i_a31_prcm_data,
+        },
+        { /* sentinel */ },
+};
+
+static int sun6i_prcm_probe(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        const struct of_device_id *match;
+        const struct prcm_data *data;
+        struct resource *res;
+        int ret;
+
+        match = of_match_node(sun6i_prcm_dt_ids, np);
+        if (!match)
+                return -EINVAL;
+
+        data = match->data;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "no prcm memory region provided\n");
+                return -ENOENT;
+        }
+
+        ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
+                              res, -1, NULL);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to add subdevices\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static struct platform_driver sun6i_prcm_driver = {
+        .driver = {
+                .name = "sun6i-prcm",
+                .owner = THIS_MODULE,
+                .of_match_table = sun6i_prcm_dt_ids,
+        },
+        .probe = sun6i_prcm_probe,
+};
+module_platform_driver(sun6i_prcm_driver);
+
+MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
+MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
+MODULE_LICENSE("GPL v2");