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Message-ID: <CAA8EJpqOd1Sz_538ZwhPh+AesVRBRmzMiQ0ntsvm4i5erKM-jA@mail.gmail.com>
Date: Thu, 15 Feb 2024 16:42:00 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>, Stephen Boyd <sboyd@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>, Bjorn Andersson <andersson@...nel.org>,
Neil Armstrong <neil.armstrong@...aro.org>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Srini Kandagatla <srinivas.kandagatla@...aro.org>, Johan Hovold <johan@...nel.org>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC v3 3/4] spmi: pmic-arb: Make core resources acquiring
a version operation
On Thu, 15 Feb 2024 at 15:32, Abel Vesa <abel.vesa@...aro.org> wrote:
>
> On 24-02-15 11:30:23, Dmitry Baryshkov wrote:
> > On Wed, 14 Feb 2024 at 23:36, Abel Vesa <abel.vesa@...aro.org> wrote:
> > >
> > > On 24-02-14 22:18:33, Konrad Dybcio wrote:
> > > > On 14.02.2024 22:13, Abel Vesa wrote:
> > > > > Rather than setting up the core, obsrv and chnls in probe by using
> > > > > version specific conditionals, add a dedicated "get_core_resources"
> > > > > version specific op and move the acquiring in there.
> > > > >
> > > > > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > > > > ---
> > > > > drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
> > > > > 1 file changed, 78 insertions(+), 33 deletions(-)
> > > > >
> > > > > diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> > > > > index 23939c0d225f..489556467a4c 100644
> > > > > --- a/drivers/spmi/spmi-pmic-arb.c
> > > > > +++ b/drivers/spmi/spmi-pmic-arb.c
> > > > > @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
> > > > > */
> > > > > struct pmic_arb_ver_ops {
> > > > > const char *ver_str;
> > > > > + int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
> > > > > int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
> > > > > int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
> > > > > /* spmi commands (read_cmd, write_cmd, cmd) functionality */
> > > > > @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
> > > > > return 0;
> > > > > }
> > > > >
> > > > > +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> > > > > + void __iomem *core)
> > > > > +{
> > > > > + struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > > > +
> > > > > + pmic_arb->wr_base = core;
> > > > > + pmic_arb->rd_base = core;
> > > > > +
> > > > > + pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> > > > > +
> > > > > + return 0;
> > > > > +}
> > > > > +
> > > > > static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
> > > > > {
> > > > > u32 *mapping_table;
> > > > > @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
> > > > > return apid;
> > > > > }
> > > > >
> > > > > +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> > > > > +{
> > > > > + struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > > > + struct device *dev = &pdev->dev;
> > > > > + struct resource *res;
> > > > > +
> > > > > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > >
> > > > It's no longer indented to deep, no need to keep such aggressive wrapping
> > > >
> > >
> > > The pmic_arb_get_obsrvr_chnls_v2 is used by both:
> > > pmic_arb_get_core_resources_v2
> > > pmic_arb_get_core_resources_v7
> > >
> > > > > + "obsrvr");
> > > > > + pmic_arb->rd_base = devm_ioremap(dev, res->start,
> > > > > + resource_size(res));
> > > > > + if (IS_ERR(pmic_arb->rd_base))
> > > > > + return PTR_ERR(pmic_arb->rd_base);
> > > > > +
> > > > > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > > > + "chnls");
> > > > > + pmic_arb->wr_base = devm_ioremap(dev, res->start,
> > > > > + resource_size(res));
> > > > > + if (IS_ERR(pmic_arb->wr_base))
> > > > > + return PTR_ERR(pmic_arb->wr_base);
> > > >
> > > > Could probably make it "devm_platform_get_and_ioremap_resource "
> > >
> > > The reason this needs to stay as is is because of reason explained by
> > > the following comment found in probe:
> > >
> > > /*
> > > * Please don't replace this with devm_platform_ioremap_resource() or
> > > * devm_ioremap_resource(). These both result in a call to
> > > * devm_request_mem_region() which prevents multiple mappings of this
> > > * register address range. SoCs with PMIC arbiter v7 may define two
> > > * arbiter devices, for the two physical SPMI interfaces, which share
> > > * some register address ranges (i.e. "core", "obsrvr", and "chnls").
> > > * Ensure that both devices probe successfully by calling devm_ioremap()
> > > * which does not result in a devm_request_mem_region() call.
> > > */
> > >
> > > Even though, AFAICT, there is no platform that adds a second node for
> > > the second bus, currently, in mainline, we should probably allow the
> > > "legacy" approach to still work.
> >
> > If there were no DT files which used two SPMI devices, I think we
> > should drop this comment and use existing helpers. We must keep
> > compatibility with the existing DTs, not with the _possible_ device
> > trees.
>
> Sure.
>
> Should I drop the qcom,bus-id from the driver as well? It is optional
> after all.
I think so. Let's drop it completely. And for the new sub-devices you
perfectly know the bus ID.
--
With best wishes
Dmitry
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