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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>
This commit is contained in:
Jon Hunter 2017-03-28 13:42:55 +01:00 committed by Thierry Reding
parent 7e10cf7436
commit 841fd94c43
1 changed files with 30 additions and 4 deletions
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34
drivers/soc/tegra/flowctrl.c
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@ -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;