RE: [EXT] Re: [PATCH v2 2/4] mux: convert to use fwnode interface

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Hi Peter,

> -----Original Message-----
> From: Peter Rosin <peda@xxxxxxxxxx>
> Sent: Thursday, August 25, 2022 5:15 PM
> To: Xu Yang <xu.yang_2@xxxxxxx>; heikki.krogerus@xxxxxxxxxxxxxxx; robh+dt@xxxxxxxxxx; shawnguo@xxxxxxxxxx
> Cc: gregkh@xxxxxxxxxxxxxxxxxxx; linux@xxxxxxxxxxxx; Jun Li <jun.li@xxxxxxx>; linux-usb@xxxxxxxxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>; devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH v2 2/4] mux: convert to use fwnode interface
> 
> Caution: EXT Email
> 
> Hi!
> 
> Much better, one small thing though...
> 
> 2022-08-23 at 21:54, Xu Yang wrote:
> > As firmware node is a more common abstract, this will convert the whole
> > thing to fwnode interface.
> >
> > Signed-off-by: Xu Yang <xu.yang_2@xxxxxxx>
> >
> > ---
> > Changes since v1:
> > - convert to use fwnode interface
> >
> >  drivers/mux/core.c | 65 +++++++++++++++++++++++-----------------------
> >  1 file changed, 33 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/mux/core.c b/drivers/mux/core.c
> > index 49bedbe6316c..e30e859efd33 100644
> > --- a/drivers/mux/core.c
> > +++ b/drivers/mux/core.c
> > @@ -18,8 +18,7 @@
> >  #include <linux/module.h>
> >  #include <linux/mux/consumer.h>
> >  #include <linux/mux/driver.h>
> > -#include <linux/of.h>
> > -#include <linux/of_platform.h>
> > +#include <linux/property.h>
> >  #include <linux/slab.h>
> >
> >  /*
> > @@ -510,11 +509,11 @@ int mux_state_deselect(struct mux_state *mstate)
> >  EXPORT_SYMBOL_GPL(mux_state_deselect);
> >
> >  /* Note this function returns a reference to the mux_chip dev. */
> > -static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
> > +static struct mux_chip *of_find_mux_chip_by_node(struct fwnode_handle *fwnode)
> 
> Please rename this function to mux_chip_find_by_fwnode()
> 

Thanks for your review. 
Will change it in next version.

Best Regards,
Xu Yang

> Cheers,
> Peter
> 
> >  {
> >       struct device *dev;
> >
> > -     dev = class_find_device_by_of_node(&mux_class, np);
> > +     dev = class_find_device_by_fwnode(&mux_class, fwnode);
> >
> >       return dev ? to_mux_chip(dev) : NULL;
> >  }
> > @@ -531,8 +530,8 @@ static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
> >  static struct mux_control *mux_get(struct device *dev, const char *mux_name,
> >                                  unsigned int *state)
> >  {
> > -     struct device_node *np = dev->of_node;
> > -     struct of_phandle_args args;
> > +     struct fwnode_handle *fwnode = dev_fwnode(dev);
> > +     struct fwnode_reference_args args;
> >       struct mux_chip *mux_chip;
> >       unsigned int controller;
> >       int index = 0;
> > @@ -540,11 +539,11 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name,
> >
> >       if (mux_name) {
> >               if (state)
> > -                     index = of_property_match_string(np, "mux-state-names",
> > -                                                      mux_name);
> > +                     index = fwnode_property_match_string(fwnode,
> > +                                     "mux-state-names", mux_name);
> >               else
> > -                     index = of_property_match_string(np, "mux-control-names",
> > -                                                      mux_name);
> > +                     index = fwnode_property_match_string(fwnode,
> > +                                     "mux-control-names", mux_name);
> >               if (index < 0) {
> >                       dev_err(dev, "mux controller '%s' not found\n",
> >                               mux_name);
> > @@ -553,35 +552,37 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name,
> >       }
> >
> >       if (state)
> > -             ret = of_parse_phandle_with_args(np,
> > -                                              "mux-states", "#mux-state-cells",
> > -                                              index, &args);
> > +             ret = fwnode_property_get_reference_args(fwnode,
> > +                                     "mux-states", "#mux-state-cells",
> > +                                     0, index, &args);
> >       else
> > -             ret = of_parse_phandle_with_args(np,
> > -                                              "mux-controls", "#mux-control-cells",
> > -                                              index, &args);
> > +             ret = fwnode_property_get_reference_args(fwnode,
> > +                                     "mux-controls", "#mux-control-cells",
> > +                                     0, index, &args);
> > +
> >       if (ret) {
> > -             dev_err(dev, "%pOF: failed to get mux-%s %s(%i)\n",
> > -                     np, state ? "state" : "control", mux_name ?: "", index);
> > +             dev_err(dev, "%pfw: failed to get mux-%s %s(%i)\n",
> > +                     fwnode, state ? "state" : "control", mux_name ?: "",
> > +                     index);
> >               return ERR_PTR(ret);
> >       }
> >
> > -     mux_chip = of_find_mux_chip_by_node(args.np);
> > -     of_node_put(args.np);
> > +     mux_chip = of_find_mux_chip_by_node(args.fwnode);
> > +     fwnode_handle_put(args.fwnode);
> >       if (!mux_chip)
> >               return ERR_PTR(-EPROBE_DEFER);
> >
> >       controller = 0;
> >       if (state) {
> > -             if (args.args_count > 2 || args.args_count == 0 ||
> > -                 (args.args_count < 2 && mux_chip->controllers > 1)) {
> > -                     dev_err(dev, "%pOF: wrong #mux-state-cells for %pOF\n",
> > -                             np, args.np);
> > +             if (args.nargs > 2 || args.nargs == 0 ||
> > +                 (args.nargs < 2 && mux_chip->controllers > 1)) {
> > +                     dev_err(dev, "%pfw: wrong #mux-state-cells for %pfw\n",
> > +                             fwnode, args.fwnode);
> >                       put_device(&mux_chip->dev);
> >                       return ERR_PTR(-EINVAL);
> >               }
> >
> > -             if (args.args_count == 2) {
> > +             if (args.nargs == 2) {
> >                       controller = args.args[0];
> >                       *state = args.args[1];
> >               } else {
> > @@ -589,21 +590,21 @@ static struct mux_control *mux_get(struct device *dev, const char *mux_name,
> >               }
> >
> >       } else {
> > -             if (args.args_count > 1 ||
> > -                 (!args.args_count && mux_chip->controllers > 1)) {
> > -                     dev_err(dev, "%pOF: wrong #mux-control-cells for %pOF\n",
> > -                             np, args.np);
> > +             if (args.nargs > 1 ||
> > +                 (!args.nargs && mux_chip->controllers > 1)) {
> > +                     dev_err(dev, "%pfw: wrong #mux-control-cells for %pfw\n",
> > +                             fwnode, args.fwnode);
> >                       put_device(&mux_chip->dev);
> >                       return ERR_PTR(-EINVAL);
> >               }
> >
> > -             if (args.args_count)
> > +             if (args.nargs)
> >                       controller = args.args[0];
> >       }
> >
> >       if (controller >= mux_chip->controllers) {
> > -             dev_err(dev, "%pOF: bad mux controller %u specified in %pOF\n",
> > -                     np, controller, args.np);
> > +             dev_err(dev, "%pfw: bad mux controller %u specified in %pfw\n",
> > +                     fwnode, controller, args.fwnode);
> >               put_device(&mux_chip->dev);
> >               return ERR_PTR(-EINVAL);
> >       }




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