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f40008a4be
This patch adds a very rudimentary driver for the SPMI arbitrator used to access the PMIC. It doesn't support all the controller's actual arbitration features, so it should probably not be used concurrently with a running kernel (and it's also not optimized for performance). But it can be used to set a few registers during boot or on shutdown to control reset handling, which is all we need it for. Change-Id: I8631c34a2a89ac71aa1ec9b8266e818c922fe34a Signed-off-by: Julius Werner <jwerner@chromium.org>
23 lines
711 B
C
23 lines
711 B
C
/*
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* Copyright (c) 2020, Google LLC. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef SPMI_ARB_H
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#define SPMI_ARB_H
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#include <stdint.h>
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/*******************************************************************************
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* WARNING: This driver does not arbitrate access with the kernel. These APIs
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* must only be called when the kernel is known to be quiesced (such as before
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* boot or while the system is shutting down).
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******************************************************************************/
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/* 32-bit addresses combine (U)SID, PID and register address. */
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int spmi_arb_read8(uint32_t addr);
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int spmi_arb_write8(uint32_t addr, uint8_t data);
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#endif /* SPMI_ARB_H */
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