From b84d4d0932ddbd80416368f5ccdadee34f74b968 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Fri, 6 Dec 2019 21:42:52 -0700 Subject: x86: Add low-power subsystem (lpss) support This subsystem is present on various Intel SoCs. Add very basic support for taking an lpss device out of reset. Signed-off-by: Simon Glass Reviewed-by: Bin Meng --- arch/x86/include/asm/lpss.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 arch/x86/include/asm/lpss.h (limited to 'arch/x86/include') diff --git a/arch/x86/include/asm/lpss.h b/arch/x86/include/asm/lpss.h new file mode 100644 index 00000000000..78148726881 --- /dev/null +++ b/arch/x86/include/asm/lpss.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2019 Google LLC + */ + +#ifndef __ASM_LPSS_H +#define __ASM_LPSS_H + +struct udevice; + +/* D0 and D3 enable config */ +enum lpss_pwr_state { + STATE_D0 = 0, + STATE_D3 = 3 +}; + +/** + * lpss_reset_release() - Release device from reset + * + * This is used for devices which have LPSS support. + * + * @regs: Pointer to device registers + */ +void lpss_reset_release(void *regs); + +/** + * lpss_set_power_state() - Change power state of a device + * + * This is used for devices which have LPSS support. + * + * @dev: Device to update + * @state: New power state to set + */ +void lpss_set_power_state(struct udevice *dev, enum lpss_pwr_state state); + +#endif -- cgit v1.3.1