[PATCH v2 4/6] soc: samsung: exynos-pmu: Register exynos-pmu driver as a mfd driver

[Amit Daniel Kachhap]

This can be used later to probe and configure PMU client drivers
like pm domain, pm sleep etc. A global structure pmu_dev_client_data is
created to pass exynos-pmu platform data to all the clients. Currently
the data passed is register base addresses.
Although the exynos-pmu driver also provides the sysreg interfaces to
provide register base addresses but this is costlier than readl/writel,
so both the interfaces are provided to mfd based exynos-pmu client
drivers.

Reviewed-by: Pankaj Dubey <pankaj.du...@samsung.com>
Signed-off-by: Amit Daniel Kachhap <amit.dan...@samsung.com>
---
 drivers/soc/samsung/exynos-pmu.c       |   24 ++++++++++++++++++++++++
 include/linux/soc/samsung/exynos-pmu.h |    5 +++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c
index 3832cda..4a5eb50 100644
--- a/drivers/soc/samsung/exynos-pmu.c
+++ b/drivers/soc/samsung/exynos-pmu.c
@@ -12,11 +12,17 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/mfd/core.h>
 #include <linux/soc/samsung/exynos-regs-pmu.h>
 #include <linux/soc/samsung/exynos-pmu.h>
 
 #define PMU_TABLE_END  (-1U)
 
+enum pmu_mfd_list {
+       MFD_POWER_DOMAIN,
+       MFD_MAX,
+};
+
 struct exynos_pmu_conf {
        unsigned int offset;
        unsigned int val[NUM_SYS_POWERDOWN];
@@ -33,6 +39,8 @@ struct exynos_pmu_data {
 struct exynos_pmu_context {
        struct device *dev;
        const struct exynos_pmu_data *pmu_data;
+       struct mfd_cell cells[MFD_MAX];
+       struct pmu_dev_client_data mfd_data;
 };
 
 static void __iomem *pmu_base_addr;
@@ -482,6 +490,8 @@ static int exynos_pmu_probe(struct platform_device *pdev)
        const struct of_device_id *match;
        struct device *dev = &pdev->dev;
        struct resource *res;
+       struct mfd_cell *cell;
+       int ret;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        pmu_base_addr = devm_ioremap_resource(dev, res);
@@ -506,6 +516,20 @@ static int exynos_pmu_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, pmu_context);
 
+       /* Initialize and invoke mfd clients */
+       cell = &pmu_context->cells[MFD_POWER_DOMAIN];
+       cell->name = "exynos-pmu-sleep";
+       pmu_context->mfd_data.mem_base_addr = pmu_base_addr;
+       pmu_context->mfd_data.mem_size = resource_size(res);
+       cell->platform_data = &pmu_context->mfd_data;
+       cell->pdata_size = sizeof(pmu_context->mfd_data);
+       ret = mfd_add_devices(&pdev->dev, pdev->id, pmu_context->cells, MFD_MAX,
+                               NULL, 0, NULL);
+       if (ret) {
+               dev_err(&pdev->dev, "fail to register client devices\n");
+               return ret;
+       }
+
        dev_dbg(dev, "Exynos PMU Driver probe done\n");
        return 0;
 }
diff --git a/include/linux/soc/samsung/exynos-pmu.h 
b/include/linux/soc/samsung/exynos-pmu.h
index a2ab0d5..d2f4083 100644
--- a/include/linux/soc/samsung/exynos-pmu.h
+++ b/include/linux/soc/samsung/exynos-pmu.h
@@ -19,6 +19,11 @@ enum sys_powerdown {
        NUM_SYS_POWERDOWN,
 };
 
+struct pmu_dev_client_data {
+       void __iomem *mem_base_addr;
+       unsigned int mem_size;
+};
+
 extern void exynos_sys_powerdown_conf(enum sys_powerdown mode);
 
 #endif /* __EXYNOS_PMU_H */
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/