linux-kernel - Re: [PATCH v2 2/8] remoteproc: qcom: Introduce driver to store pil info in IMEM

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Message-ID: <20200122230849.GC3261042@ripper>
Date:   Wed, 22 Jan 2020 15:08:49 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     rishabhb@...eaurora.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        Sibi Sankar <sibis@...eaurora.org>
Subject: Re: [PATCH v2 2/8] remoteproc: qcom: Introduce driver to store pil
 info in IMEM

On Wed 22 Jan 14:56 PST 2020, rishabhb@...eaurora.org wrote:
> On 2019-12-26 21:32, Bjorn Andersson wrote:
> > diff --git a/drivers/remoteproc/qcom_pil_info.c
[..]
> > +static int pil_reloc_probe(struct platform_device *pdev)
> > +{
> > +	struct pil_reloc *reloc;
> > +
> > +	reloc = devm_kzalloc(&pdev->dev, sizeof(*reloc), GFP_KERNEL);
> > +	if (!reloc)
> > +		return -ENOMEM;
> > +
> > +	reloc->dev = &pdev->dev;
> > +	reloc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
> If there are multiple entries like "pil-reloc" in the imem node
> mapping the entire imem multiple times may not work. Is there a way
> we can somehow just iomap the required region for pil?

With the entire imem being represented as a syscon this will be
ioremapped once and all callers of syscon_node_to_regmap() (or one of
the other syscon getters) will get a regmap back that reference this one
mapping.

So doing it this way allow us to "map" sections of imem that is smaller
than PAGE_SIZE.


That said, it means that all imem users/clients should access imem
through this syscon regmap.

Regards,
Bjorn