Date: Tue, 18 Nov 2014 09:25:47 -0800
From: =?utf-8?B?U8O2cmVu?= Brinkmann <soren.brinkmann@xilinx.com>
To: "Ivan T. Ivanov" <iivanov@mm-sol.com>
CC: Linus Walleij <linus.walleij@linaro.org>,
        Bjorn Andersson <Bjorn.Andersson@sonymobile.com>,
        Michal Simek <michal.simek@xilinx.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        Alessandro Rubini <rubini@unipv.it>, Heiko Stuebner <heiko@sntech.de>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        <linux-rockchip@lists.infradead.org>,
        "linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>
Subject: Re: [PATCH 3/7] pinctrl: pinconf-generic: Allow driver to specify DT
 params
References: <1415041531-15520-1-git-send-email-soren.brinkmann@xilinx.com>
 <1415041531-15520-4-git-send-email-soren.brinkmann@xilinx.com>
 <CACRpkdYfj2ydLQ4q_FKwXo73jzNsvj9u2Aem9EiuEw-OCvurrg@mail.gmail.com>
 <1416300621.30131.6.camel@mm-sol.com>
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On Tue, 2014-11-18 at 10:50AM +0200, Ivan T. Ivanov wrote:
> 
> On Tue, 2014-11-11 at 15:53 +0100, Linus Walleij wrote:
> > On Mon, Nov 3, 2014 at 8:05 PM, Soren Brinkmann
> > brinkmann@xilinx.com> wrote:
> > 
> > > Additionally to the generic DT parameters, allow drivers to provide
> > > driver-specific DT parameters to be used with the generic parser
> > > infrastructure.
> > > 
> > > Signed-off-by: Soren Brinkmann brinkmann@xilinx.com>
> > 
> > I like the looks of this, but the patch description is a bit terse.
> > I'd like it to describe some of the refactorings being done
> > to the intrinsics, because I have a hard time following the patch.
> > 
> > First please rebase onto the "devel" branch in the pin control
> > tree, and notice that drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
> > which is merged there is actually doing this already:
> > 
> > 
> >         for_each_child_of_node(np_config, np) {
> >                 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
> >                                                         &reserv, nmaps, type);
> >                 if (ret)
> >                         break;
> > 
> >                 ret = pmic_gpio_dt_subnode_to_map(pctldev, np, map, &reserv,
> >                                                   nmaps, type);
> >                 if (ret)
> >                         break;
> >         }
> > 
> > So it should be patched to illustrate the point of this code.
> > 
> 
> I like the idea, but have issues with implementations :-). 
>  
> It is supposed that additional parameters are not generic, 
> otherwise they will be part of enum pin_config_param, right?
> 
> Probably it will be better if clients could pass array with
> driver specific dt bindings to pinconf_generic_dt_node_to_map()?

My idea was to hide that API from the driver. You just pass those
parameters as part of the struct pctldev and the parser - whether this
generic one or anything else - would do the right thing. I don't think
calling the parser from the driver is the right approach.

	Thanks,
	Sören
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