Commit 0a293451 authored by Kartik Rajput's avatar Kartik Rajput Committed by Alexandre Belloni
Browse files

rtc: tegra: Add ACPI support 



Add ACPI support for Tegra RTC, which is available on Tegra241 and
Tegra410. Both Tegra241 and Tegra410 use the same ACPI ID 'NVDA0280'.
When ACPI boot is used, the RTC clock is configured by UEFI before
the kernel boots. On device-tree boot, the probe must fail if clocks are
not provided in the device-tree.

Signed-off-by: default avatarKartik Rajput <kkartik@nvidia.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: default avatarJon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20251024064952.775883-2-kkartik@nvidia.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent b665c1b6

drivers/rtc/rtc-tegra.c

+12 −3
Original line number Diff line number Diff line
@@ -274,6 +274,12 @@ static const struct of_device_id tegra_rtc_dt_match[] = { 
};

MODULE_DEVICE_TABLE(of, tegra_rtc_dt_match);



static const struct acpi_device_id tegra_rtc_acpi_match[] = {

	{ "NVDA0280" },

	{ }

};

MODULE_DEVICE_TABLE(acpi, tegra_rtc_acpi_match);



static int tegra_rtc_probe(struct platform_device *pdev)

{

	struct tegra_rtc_info *info;
@@ -300,9 +306,11 @@ static int tegra_rtc_probe(struct platform_device *pdev) 
	info->rtc->ops = &tegra_rtc_ops;

	info->rtc->range_max = U32_MAX;



	if (dev_of_node(&pdev->dev)) {

		info->clk = devm_clk_get_enabled(&pdev->dev, NULL);

		if (IS_ERR(info->clk))

			return PTR_ERR(info->clk);

	}



	/* set context info */

	info->pdev = pdev;
@@ -386,6 +394,7 @@ static struct platform_driver tegra_rtc_driver = { 
	.driver = {

		.name = "tegra_rtc",

		.of_match_table = tegra_rtc_dt_match,

		.acpi_match_table = tegra_rtc_acpi_match,

		.pm = &tegra_rtc_pm_ops,

	},

};