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Commit 841fd94c authored by Jon Hunter's avatar Jon Hunter Committed by Thierry Reding
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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: default avatarJon Hunter <jonathanh@nvidia.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 7e10cf74

drivers/soc/tegra/flowctrl.c

+30 −4
Original line number Diff line number Diff line
@@ -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;