[U-Boot] [i.MX8MM+CCF 12/41] clk: fixed_rate: add pre reloc flag

[Lukasz Majewski]

On Tue, 7 May 2019 22:00:14 +0800
Bin Meng <bmeng.cn at gmail.com> wrote:

> Hi Peng,
> 
> On Tue, May 7, 2019 at 9:30 PM Peng Fan <peng.fan at nxp.com> wrote:
> >  
> > > Subject: Re: [i.MX8MM+CCF 12/41] clk: fixed_rate: add pre reloc
> > > flag
> > >
> > > On Tue, 30 Apr 2019 10:18:12 +0000
> > > Peng Fan <peng.fan at nxp.com> wrote:
> > >  
> > > > Add pre reloc flag to use this driver before relocation
> > > >
> > > > Signed-off-by: Peng Fan <peng.fan at nxp.com>
> > > > ---
> > > >  drivers/clk/clk_fixed_rate.c | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/drivers/clk/clk_fixed_rate.c
> > > > b/drivers/clk/clk_fixed_rate.c index 069e643fbc..debada1463
> > > > 100644 --- a/drivers/clk/clk_fixed_rate.c
> > > > +++ b/drivers/clk/clk_fixed_rate.c
> > > > @@ -45,4 +45,5 @@ U_BOOT_DRIVER(clk_fixed_rate) = {
> > > >     .ofdata_to_platdata = clk_fixed_rate_ofdata_to_platdata,
> > > >     .platdata_auto_alloc_size = sizeof(struct clk_fixed_rate),
> > > >     .ops = &clk_fixed_rate_ops,
> > > > +   .flags = DM_FLAG_PRE_RELOC,
> > > >  };  
> > >
> > > This probably shall be done with proper dts file (from TPC70 -
> > > imx6q conversion code):  
> >
> > My understanding is DM_FLAG_PRE_RELOC will let the driver could be
> > used before relocation. The dts u-boot,dm-spl or u-boot,dm-pre-reloc
> > is just to mark the device could be used at the corresponding stage.
> > Only modify dts will not make it work without the DM_FLAG_PRE_RELOC,
> > Right?
> >  
> 
> I think your understanding is correct. For device tree that cannot be
> modified by U-Boot, eg: DT passed from previous bootloader, the only
> way to support pre-relocation binding is to add DM_FLAG_PRE_RELOC in
> the U-Boot driver.

But as fair as I understand - the discussion is about SPL, not u-boot's
proper pre-location stage.

Please correct me if I'm wrong, but the recent code removes from
u-boot's proper DTS u-boot,dm-* properties.

> 
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> 
> Regards,
> Bin




Best regards,

Lukasz Majewski

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