[v5,09/10] ARM: export arm_pm_restart
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Message ID 20190110175845.1203986-10-lkundrak@v3.sk
State New
Headers show
Series
  • Add support for OLPC XO 1.75 Embedded Controller
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Commit Message

Lubomir Rintel Jan. 10, 2019, 5:58 p.m. UTC
The OLPC XO 1.75 laptop is rebooted with a command to the Embedded
Controller. The EC driver should be a module, since most people don't need
it to be compiled in.

The EC driver can't use register_restart_handler() because handlers
registered with it are executed in atomic context and the XO 1.75 reboot
dance needs to block: the reboot is initiated by poking a GPIO ofter
which we need to wait for the EC to initiate a SPI transfer and finish
it.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v4:
- Clarify why we need this

 arch/arm/kernel/reboot.c | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/arch/arm/kernel/reboot.c b/arch/arm/kernel/reboot.c
index 3b2aa9a9fe26..71016cf19b86 100644
--- a/arch/arm/kernel/reboot.c
+++ b/arch/arm/kernel/reboot.c
@@ -22,6 +22,7 @@  typedef void (*phys_reset_t)(unsigned long, bool);
  * Function pointers to optional machine specific functions
  */
 void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
+EXPORT_SYMBOL_GPL(arm_pm_restart);
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);