power/reset: at91-reset: get and use slow clock
Commit dca1a4b5ff
("clk: at91: keep slow clk enabled to prevent system
hang") added a workaround for the slow clock as it is not properly handled
by its users.
Get and use the slow clock as it is necessary for the at91 reset
controller.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
steinar/wifi_calib_4_9_kernel
parent
6e64180a7c
commit
2b2c6148fe
|
@ -11,6 +11,7 @@
|
||||||
* warranty of any kind, whether express or implied.
|
* warranty of any kind, whether express or implied.
|
||||||
*/
|
*/
|
||||||
|
|
||||||
|
#include <linux/clk.h>
|
||||||
#include <linux/io.h>
|
#include <linux/io.h>
|
||||||
#include <linux/module.h>
|
#include <linux/module.h>
|
||||||
#include <linux/of_address.h>
|
#include <linux/of_address.h>
|
||||||
|
@ -46,6 +47,7 @@ enum reset_type {
|
||||||
};
|
};
|
||||||
|
|
||||||
static void __iomem *at91_ramc_base[2], *at91_rstc_base;
|
static void __iomem *at91_ramc_base[2], *at91_rstc_base;
|
||||||
|
static struct clk *sclk;
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* unless the SDRAM is cleanly shutdown before we hit the
|
* unless the SDRAM is cleanly shutdown before we hit the
|
||||||
|
@ -205,9 +207,21 @@ static int __init at91_reset_probe(struct platform_device *pdev)
|
||||||
match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
|
match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
|
||||||
at91_restart_nb.notifier_call = match->data;
|
at91_restart_nb.notifier_call = match->data;
|
||||||
|
|
||||||
ret = register_restart_handler(&at91_restart_nb);
|
sclk = devm_clk_get(&pdev->dev, NULL);
|
||||||
if (ret)
|
if (IS_ERR(sclk))
|
||||||
|
return PTR_ERR(sclk);
|
||||||
|
|
||||||
|
ret = clk_prepare_enable(sclk);
|
||||||
|
if (ret) {
|
||||||
|
dev_err(&pdev->dev, "Could not enable slow clock\n");
|
||||||
return ret;
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = register_restart_handler(&at91_restart_nb);
|
||||||
|
if (ret) {
|
||||||
|
clk_disable_unprepare(sclk);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
at91_reset_status(pdev);
|
at91_reset_status(pdev);
|
||||||
|
|
||||||
|
@ -217,6 +231,7 @@ static int __init at91_reset_probe(struct platform_device *pdev)
|
||||||
static int __exit at91_reset_remove(struct platform_device *pdev)
|
static int __exit at91_reset_remove(struct platform_device *pdev)
|
||||||
{
|
{
|
||||||
unregister_restart_handler(&at91_restart_nb);
|
unregister_restart_handler(&at91_restart_nb);
|
||||||
|
clk_disable_unprepare(sclk);
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue