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drivers: qcom: rpmh: add RPMH helper functions

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Sending RPMH requests and waiting for response from the controller
through a callback is common functionality across all platform drivers.
To simplify drivers, add a library functions to create RPMH client and
send resource state requests.

rpmh_write() is a synchronous blocking call that can be used to send
active state requests.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Lina Iyer 2018-06-20 18:57:01 +05:30 • committed by Andy Gross
parent fc087fe5a4
commit c1038456b0
5 changed files with 179 additions and 3 deletions
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25
include/soc/qcom/rpmh.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
*/
#ifndef __SOC_QCOM_RPMH_H__
#define __SOC_QCOM_RPMH_H__
#include <soc/qcom/tcs.h>
#include <linux/platform_device.h>
#if IS_ENABLED(CONFIG_QCOM_RPMH)
int rpmh_write(const struct device *dev, enum rpmh_state state,
const struct tcs_cmd *cmd, u32 n);
#else
static inline int rpmh_write(const struct device *dev, enum rpmh_state state,
const struct tcs_cmd *cmd, u32 n)
{ return -ENODEV; }
#endif /* CONFIG_QCOM_RPMH */
#endif /* __SOC_QCOM_RPMH_H__ */