linux-kernel - Re: [PATCH v2 05/12] remoteproc: stm32: Parse syscon that will manage M4 synchronisation

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Message-ID: <20200514050333.GK16107@builder.lan>
Date:   Wed, 13 May 2020 22:03:33 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     ohad@...ery.com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...com, loic.pallardy@...com,
        arnaud.pouliquen@...com, linux-remoteproc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/12] remoteproc: stm32: Parse syscon that will
 manage M4 synchronisation

On Fri 24 Apr 13:24 PDT 2020, Mathieu Poirier wrote:

> 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
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Reviewed-by: Loic Pallardy <loic.pallardy@...com>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/remoteproc/stm32_rproc.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> index 658439d4b00a..a285f338bed8 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -70,6 +70,8 @@ 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;
> @@ -606,6 +608,30 @@ 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;
>  }
>  
> -- 
> 2.20.1
>