linux-kernel - RE: [EXT] Re: [v2 2/3] clk: ls1028a: Add clock driver for Display output interface

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Date:   Mon, 19 Aug 2019 11:29:43 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-devel@...ux.nxdi.nxp.com" <linux-devel@...ux.nxdi.nxp.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, Wen He <wen.he_1@....com>
Cc:     Leo Li <leoyang.li@....com>,
        "liviu.dudau@....com" <liviu.dudau@....com>
Subject: RE: [EXT] Re: [v2 2/3] clk: ls1028a: Add clock driver for Display output interface

Quoting Wen He (2019-08-19 00:30:49)
> > Quoting Wen He (2019-08-15 03:16:12)
> > > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index
> > > 801fa1cd0321..3c95d8ec31d4 100644
> > > --- a/drivers/clk/Kconfig
> > > +++ b/drivers/clk/Kconfig
> > > @@ -223,6 +223,16 @@ config CLK_QORIQ
> > >           This adds the clock driver support for Freescale QorIQ platforms
> > >           using common clock framework.
> > >
> > > +config CLK_LS1028A_PLLDIG
> > > +        bool "Clock driver for LS1028A Display output"
> > > +       depends on (ARCH_LAYERSCAPE || COMPILE_TEST) && OF
> > 
> > Where is the OF dependency to build anything? Doesn't this still compile
> > without CONFIG_OF set?
> 
> Yes, current included some APIs of the OF, like of_get_parent_name()

And there isn't a stub API for of_get_parent_name when OF isn't defined?

> > > +
> > > +static int plldig_clk_probe(struct platform_device *pdev) {
> > > +       struct clk_plldig *data;
> > > +       struct resource *mem;
> > > +       const char *parent_name;
> > > +       struct clk_init_data init = {};
> > > +       struct device *dev = &pdev->dev;
> > > +       int ret;
> > > +
> > > +       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> > > +       if (!data)
> > > +               return -ENOMEM;
> > > +
> > > +       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > +       data->regs = devm_ioremap_resource(dev, mem);
> > > +       if (IS_ERR(data->regs))
> > > +               return PTR_ERR(data->regs);
> > > +
> > > +       init.name = dev->of_node->name;
> > > +       init.ops = &plldig_clk_ops;
> > > +       parent_name = of_clk_get_parent_name(dev->of_node, 0);
> > > +       init.parent_names = &parent_name;
> > 
> > Can you use the new way of specifying clk parents with the parent_data
> > member of clk_init?
> 
> Of course, but I don't understand why need recommend to use this member?
> Is that the member parent_names will be discard in future?
> 
> Here are definition of the clk-provider.h
> /* Only one of the following three should be assigned */
> const char              * const *parent_names;
> const struct clk_parent_data    *parent_data;
> const struct clk_hw             **parent_hws;
> 
> For PLLDIG, it only has one parent.

Yes. Can you use clk_parent_data array and specify a DT index of 0 and
some name that would go into "clock-names" in the .fw_name member?