rk3328 suspend: How to define wakeup sources?

pablo

Hi all,

Can anyone describe how to configure the roc-rk3328-cc for suspend and wakeup? I need information on:

• how to configure the rk3328 for low power consumption in suspend
• how to configure wakeup sources: USB OTG, UART, GPIO...
  

In the Firefly (roc-rk3328-cc) and Rockchip (develop-4.4) Linux kernel repos the process is just barely described in Documentation/devicetree/bindings/soc/rockchip/rockchip-pm-config.txt, with the rk3328 configuration example being only how to disable:

1. rockchip_suspend: rockchip-suspend {
   
2.                 compatible = "rockchip,pm-rk3328";
   
3.                 status = "disabled";
   
4.                 rockchip,virtual-poweroff = <0>;
   
5. };

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The actual rk3328.dtsi files in the Firefly (roc-rk3328-cc) and Rockchip (develop-4.4) Linux kernel repos look slightly different, why? And why are not rockchip,wakeup-config and rockchip,pwm-regulator-config configured?

      

1. rockchip_suspend: rockchip-suspend {
   
2.                 compatible = "rockchip,pm-rk3328";
   
3.                 status = "disabled";
   
4.                 rockchip,sleep-mode-config = <0>;
   
5.                 rockchip,virtual-poweroff = <0>;
   
6.         };

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Also the corresponding suspend header file for rk3328, include/dt-bindings/suspend/rockchip-rk3328.h, does not list any relevant bits to use for sleep and wakeup configuration, like the rk3399 header file does, why?

1. /* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
   
2. /*
   
3. * Header providing constants for Rockchip suspend bindings.
   
4. *
   
5. * Copyright (C) 2018, Fuzhou Rockchip Electronics Co., Ltd
   
6. * Author: XiaoDong.Huang
   
7. */
   
8. #ifndef __DT_BINDINGS_ROCKCHIP_PM_H__
   
9. #define __DT_BINDINGS_ROCKCHIP_PM_H__
   
10. /******************************bits ops************************************/
    
11. 
    
12. #ifndef BIT
    
13. #define BIT(nr)                         (1 << (nr))
    
14. #endif
    
15. 
    
16. #define RKPM_SLP_CTR_VOL_PWM0           BIT(10)
    
17. #define RKPM_SLP_CTR_VOL_PWM1           BIT(11)
    
18. 
    
19. #endif

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In the Rockchip (develop-4.4) Linux kernel repo the rk3328-evb-* and  rk3328-rock64-* boards seem to enable the suspend, but what is the consequence for suspend and resume? How do I configure the wakeup sources?

1. &rockchip_suspend {
   
2.     status = "okay";
   
3.     rockchip,virtual-poweroff = <1>;
   
4. };

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penguin

Please grep keyword 'wakeup' in the dts files to find some examples.