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remoteproc: stm32: Parse syscon that will manage M4 synchronisation

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Get from the DT the syncon to probe the state of the remote processor
and the location of the resource table.

Mainly based on the work published by Arnaud Pouliquen [1].

[1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877

Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Loic Pallardy <loic.pallardy@st.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200714200445.1427257-6-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2020-07-14 14:04:39 -06:00 committed by Bjorn Andersson
parent 95e32f868a
commit 9276536f45
1 changed files with 26 additions and 0 deletions
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26
drivers/remoteproc/stm32_rproc.c
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@ -71,6 +71,8 @@ struct stm32_rproc {
struct reset_control *rst;
struct stm32_syscon hold_boot;
struct stm32_syscon pdds;
struct stm32_syscon m4_state;
struct stm32_syscon rsctbl;
int wdg_irq;
u32 nb_rmems;
struct stm32_rproc_mem *rmems;
@ -607,6 +609,30 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev,
*auto_boot = of_property_read_bool(np, "st,auto-boot");
/*
* See if we can check the M4 status, i.e if it was started
* from the boot loader or not.
*/
err = stm32_rproc_get_syscon(np, "st,syscfg-m4-state",
&ddata->m4_state);
if (err) {
/* remember this */
ddata->m4_state.map = NULL;
/* no coprocessor state syscon (optional) */
dev_warn(dev, "m4 state not supported\n");
/* no need to go further */
return 0;
}
/* See if we can get the resource table */
err = stm32_rproc_get_syscon(np, "st,syscfg-rsc-tbl",
&ddata->rsctbl);
if (err) {
/* no rsc table syscon (optional) */
dev_warn(dev, "rsc tbl syscon not supported\n");
}
return 0;
}