linux-kernel - RE: [PATCH] ACPI: support for NXP i2c controller

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Date:   Thu, 5 Sep 2019 04:33:44 +0000
From:   Biwen Li <biwen.li@....com>
To:     "'andy.shevchenko@...il.com'" <andy.shevchenko@...il.com>,
        "'rafael@...nel.org'" <rafael@...nel.org>,
        Leo Li <leoyang.li@....com>,
        Meenakshi Aggarwal <meenakshi.aggarwal@....com>,
        Udit Kumar <udit.kumar@....com>,
        "'wsa@...-dreams.de'" <wsa@...-dreams.de>,
        "'rjw@...ysocki.net'" <rjw@...ysocki.net>
CC:     Chuanhua Han <chuanhua.han@....com>,
        "'shawnguo@...nel.org'" <shawnguo@...nel.org>,
        "'s.hauer@...gutronix.de'" <s.hauer@...gutronix.de>,
        "'linux-acpi@...r.kernel.org'" <linux-acpi@...r.kernel.org>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        "'linux-i2c@...r.kernel.org'" <linux-i2c@...r.kernel.org>,
        "'linux-arm-kernel@...ts.infradead.org'" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] ACPI: support for NXP i2c controller

> Hi,
> 
> On 02.09.19 23:16, Andy Shevchenko wrote:
> > On Mon, Sep 2, 2019 at 11:58 PM Rafael J. Wysocki <rafael@...nel.org>
> wrote:
> >>
> >> On Thu, Jul 11, 2019 at 12:35 PM Chuanhua Han <chuanhua.han@....com>
> wrote:
> >>>
> >>> Enable NXP i2c controller to boot with ACPI
> >>>
> >>> Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@....com>
> >>> Signed-off-by: Udit Kumar <udit.kumar@....com>
> >>> Signed-off-by: Chuanhua Han <chuanhua.han@....com>
> >>
> >> Wolfram, any objections to this from the i2c side?
> >
> > May I propose amendment(s)?
> >
> >>> @@ -44,6 +44,7 @@
> >>>   #include <linux/pm_runtime.h>
> >>>   #include <linux/sched.h>
> >>>   #include <linux/slab.h>
> >
> >>> +#include <linux/acpi.h>
> >
> > If it's kept in order, better to go with it. (Yes, it is as I have
> > checked) However, property.h should be included instead, see below.
> >
> >>>          const struct of_device_id *of_id =
> of_match_device(i2c_imx_dt_ids,
> >>>
> >>> &pdev->dev);
> >>> +       const struct acpi_device_id *acpi_id =
> >>> +                       acpi_match_device(i2c_imx_acpi_ids,
> >>> +                                         &pdev->dev);
> >
> >
> >>>          if (of_id)
> >>>                  i2c_imx->hwdata = of_id->data;
> >>> +       else if (acpi_id)
> >>> +               i2c_imx->hwdata = (struct imx_i2c_hwdata *)
> >>> +                               acpi_id->driver_data;
> >
> >
> > The above altogher may be replaced with
> >
> > const struct imx_i2c_hwdata *match;
> > ...
> > match = device_get_match_data(&pdev->dev);
> > if (match)
> >   i2c_imx->hwdata = match;
> > else
> > ...
> 
> Instead of "may be replaced", I would say: it should be replaced :)
> 
> >>> +               .acpi_match_table = ACPI_PTR(i2c_imx_acpi_ids),
> >
> > Since there is no #ifdef guard no need to use ACPI_PTR().
> >
> 
> What iMX/(other NXP?) SoCs are with ACPI support?  Where I can get one? I
> would like to know more about it.
- Nxp has variety Socs, include i.MX, Layerscape, etc.
- You can get one from here https://www.nxp.com/design/qoriq-developer-resources/qoriq-lx2160a-development-board:LX2160A-RDB

> 
> Kind regards,
> Oleksij Rempel
> 
> --
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