soc/tegra: flowctrl: Add basic platform driver

Add a simple platform driver for the flowctrl module so that it gets
registered as a proper device.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/soc/tegra/flowctrl.c b/drivers/soc/tegra/flowctrl.c
index 3a5a1cb9ae9042e26ac3a429431ab52128d70e94..25eddfc8475dd67bd0999be7eb31d2992652cfd1 100644 (file)
--- a/drivers/soc/tegra/flowctrl.c
+++ b/drivers/soc/tegra/flowctrl.c
@@ -24,6 +24,7 @@
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/platform_device.h>
 
 #include <soc/tegra/common.h>
 #include <soc/tegra/flowctrl.h>
@@ -47,7 +48,7 @@ static void __iomem *tegra_flowctrl_base;
 
 static void flowctrl_update(u8 offset, u32 value)
 {
-       if (WARN_ONCE(!tegra_flowctrl_base,
+       if (WARN_ONCE(IS_ERR_OR_NULL(tegra_flowctrl_base),
                      "Tegra flowctrl not initialised!\n"))
                return;
 
@@ -62,7 +63,7 @@ u32 flowctrl_read_cpu_csr(unsigned int cpuid)
 {
        u8 offset = flowctrl_offset_cpu_csr[cpuid];
 
-       if (WARN_ONCE(!tegra_flowctrl_base,
+       if (WARN_ONCE(IS_ERR_OR_NULL(tegra_flowctrl_base),
                      "Tegra flowctrl not initialised!\n"))
                return 0;
 
@@ -148,7 +149,22 @@ void flowctrl_cpu_suspend_exit(unsigned int cpuid)
        flowctrl_write_cpu_csr(cpuid, reg);
 }
 
-static const struct of_device_id matches[] __initconst = {
+static int tegra_flowctrl_probe(struct platform_device *pdev)
+{
+       void __iomem *base = tegra_flowctrl_base;
+       struct resource *res;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       tegra_flowctrl_base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(tegra_flowctrl_base))
+               return PTR_ERR(base);
+
+       iounmap(base);
+
+       return 0;
+}
+
+static const struct of_device_id tegra_flowctrl_match[] = {
        { .compatible = "nvidia,tegra124-flowctrl" },
        { .compatible = "nvidia,tegra114-flowctrl" },
        { .compatible = "nvidia,tegra30-flowctrl" },
@@ -156,6 +172,16 @@ static const struct of_device_id matches[] __initconst = {
        { }
 };
 
+static struct platform_driver tegra_flowctrl_driver = {
+       .driver = {
+               .name = "tegra-flowctrl",
+               .suppress_bind_attrs = true,
+               .of_match_table = tegra_flowctrl_match,
+       },
+       .probe = tegra_flowctrl_probe,
+};
+builtin_platform_driver(tegra_flowctrl_driver);
+
 static int __init tegra_flowctrl_init(void)
 {
        /* hardcoded fallback if device tree node is missing */
@@ -166,7 +192,7 @@ static int __init tegra_flowctrl_init(void)
        if (!soc_is_tegra())
                return 0;
 
-       np = of_find_matching_node(NULL, matches);
+       np = of_find_matching_node(NULL, tegra_flowctrl_match);
        if (np) {
                struct resource res;