linux/drivers/remoteproc/qcom_wcnss.h
Bjorn Andersson 1fcef985c8 remoteproc: qcom: wcnss: Fix race with iris probe
The remoteproc driver is split between the responsibilities of getting
the SoC-internal ARM core up and running and the external RF (aka
"Iris") part configured.

In order to satisfy the regulator framework's need of a struct device *
to look up supplies this was implemented as two different drivers, using
of_platform_populate() in the remoteproc part to probe the iris part.

Unfortunately it's possible that the iris part probe defers on yet not
available regulators and an attempt to start the remoteproc will have to
be rejected, until this has been resolved. But there's no useful
mechanism of knowing when this would be.

Instead replace the of_platform_populate() and the iris probe with a
function that rolls its own struct device, with the relevant of_node
associated that is enough to acquire regulators and clocks specified in
the DT node and that may propagate the EPROBE_DEFER back to the wcnss
device's probe.

Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reported-by: Anibal Limon <anibal.limon@linaro.org>
Reported-by: Loic Poulain <loic.poulain@linaro.org>
Tested-by: Anibal Limon <anibal.limon@linaro.org>
Link: https://lore.kernel.org/r/20210312002251.3273013-1-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2021-07-28 14:57:30 -05:00

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C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __QCOM_WNCSS_H__
#define __QCOM_WNCSS_H__
struct qcom_iris;
struct qcom_wcnss;
extern struct platform_driver qcom_iris_driver;
struct wcnss_vreg_info {
const char * const name;
int min_voltage;
int max_voltage;
int load_uA;
bool super_turbo;
};
struct qcom_iris *qcom_iris_probe(struct device *parent, bool *use_48mhz_xo);
void qcom_iris_remove(struct qcom_iris *iris);
int qcom_iris_enable(struct qcom_iris *iris);
void qcom_iris_disable(struct qcom_iris *iris);
#endif