linux-kernel - Re: [PATCH 3/4] hwspinlock: qcom: Allow mmio usage in addition to syscon

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Date:   Thu, 14 May 2020 10:06:54 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     Andy Gross <agross@...nel.org>, Ohad Ben-Cohen <ohad@...ery.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        Devicetree List <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] hwspinlock: qcom: Allow mmio usage in addition to
 syscon

On Tue 12 May 20:57 PDT 2020, Baolin Wang wrote:

> On Wed, May 13, 2020 at 8:55 AM Bjorn Andersson
> <bjorn.andersson@...aro.org> wrote:
> >
> > In all modern Qualcomm platforms the mutex region of the TCSR is forked
> > off into its own block, all with a offset of 0 and stride of 4096. So
> > add support for directly memory mapping this register space, to avoid
> > the need to represent this block using a syscon.
> >
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  drivers/hwspinlock/qcom_hwspinlock.c | 72 +++++++++++++++++++++-------
> >  1 file changed, 56 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/hwspinlock/qcom_hwspinlock.c b/drivers/hwspinlock/qcom_hwspinlock.c
[..]
> > +static struct regmap *qcom_hwspinlock_probe_mmio(struct platform_device *pdev,
> > +                                                u32 *offset, u32 *stride)
> > +{
> > +       struct device *dev = &pdev->dev;
> > +       struct resource *res;
> > +       void __iomem *base;
> > +
> > +       /* All modern platform has offset 0 and stride of 4k */
> > +       *offset = 0;
> > +       *stride = 0x1000;
> > +
> > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +       base = devm_ioremap_resource(&pdev->dev, res);
> 
> I think you can use devm_platform_ioremap_resource(pdev, 0) to
> simplify your code, otherwise looks good to me.

You're right, I better fix this before someone with Coccinelle get the
chance ;)

> Reviewed-by: Baolin Wang <baolin.wang7@...il.com>
> 

Thanks,
Bjorn