linux-kernel - Re: [net-next PATCH v1 6/7] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver

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Date:   Sat, 3 Oct 2020 22:00:25 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux.cj" <linux.cj@...il.com>, netdev <netdev@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Diana Madalina Craciun <diana.craciun@....com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Ioana Radulescu <ruxandra.radulescu@....com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next PATCH v1 6/7] net: dpaa2-mac: Add ACPI support for
 DPAA2 MAC driver

Hi Andy,

On Thu, Oct 01, 2020 at 06:36:06PM +0300, Andy Shevchenko wrote:
> On Wed, Sep 30, 2020 at 7:06 PM Calvin Johnson
> <calvin.johnson@....nxp.com> wrote:
> >
> > Modify dpaa2_mac_connect() to support ACPI along with DT.
> > Modify dpaa2_mac_get_node() to get the dpmac fwnode from either
> > DT or ACPI.
> >
> > Replace of_get_phy_mode with fwnode_get_phy_mode to get
> > phy-mode for a dpmac_node.
> >
> > Use helper function phylink_fwnode_phy_connect() to find phy_dev and
> > connect to mac->phylink.
> 
> ...
> 
> >  #include "dpaa2-eth.h"
> >  #include "dpaa2-mac.h"
> 
> > +#include <linux/acpi.h>
> 
> Please, put generic headers first.
> 
> > +       struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
> > +       struct fwnode_handle *dpmacs, *dpmac = NULL;
> > +       unsigned long long adr;
> > +       acpi_status status;
> >         int err;
> > +       u32 id;
> >
> > -       dpmacs = of_find_node_by_name(NULL, "dpmacs");
> > -       if (!dpmacs)
> > -               return NULL;
> > +       if (is_of_node(dev->parent->fwnode)) {
> > +               dpmacs = device_get_named_child_node(dev->parent, "dpmacs");
> > +               if (!dpmacs)
> > +                       return NULL;
> > +
> > +               while ((dpmac = fwnode_get_next_child_node(dpmacs, dpmac))) {
> > +                       err = fwnode_property_read_u32(dpmac, "reg", &id);
> > +                       if (err)
> > +                               continue;
> > +                       if (id == dpmac_id)
> > +                               return dpmac;
> > +               }
> >
> > +       } else if (is_acpi_node(dev->parent->fwnode)) {
> > +               device_for_each_child_node(dev->parent, dpmac) {
> > +                       status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(dpmac),
> > +                                                      "_ADR", NULL, &adr);
> > +                       if (ACPI_FAILURE(status)) {
> > +                               pr_debug("_ADR returned %d on %s\n",
> > +                                        status, (char *)buffer.pointer);
> > +                               continue;
> > +                       } else {
> > +                               id = (u32)adr;
> > +                               if (id == dpmac_id)
> > +                                       return dpmac;
> > +                       }
> > +               }
> 
> Can you rather implement generic one which will be
> 
> int fwnode_get_child_id(struct fwnode_handle *fwnode, u64 *id);
> 
> and put the logic of retrieving 'reg' or _ADR? Also, for the latter we
> have a special macro
> METHOD_NAME__ADR.
> 
> See [1] as well. Same idea I have shared already.
> 
> [1]: https://lore.kernel.org/linux-iio/20200824054347.3805-1-william.sung@advantech.com.tw/T/#m5f61921fa67a5b40522b7f7b17216e0d204647be
> 
> ...
> 
> > -       of_node_put(dpmac_node);
> > +       if (is_of_node(dpmac_node))
> > +               of_node_put(to_of_node(dpmac_node));
> 
> I'm not sure why you can't use fwnode_handle_put()?
> 
> > +       if (is_of_node(dpmac_node))
> > +               of_node_put(to_of_node(dpmac_node));
> 
> Ditto.

Sure. I'll take care of these comments.
Thanks
Calvin