[PATCH] ARM: dts: imx6qdl: pfla02: Update spi-nor naming for kernel compatibility

[Yunus Bas]

Hello Ahmad,

Am Montag, dem 03.05.2021 um 20:36 +0200 schrieb Ahmad Fatoum:
> Hello Yunus,
> 
> On 03.05.21 16:38, Yunus Bas wrote:
> > Hi Ahmad,
> > 
> > The main purpose behind adding MTD-partitions as NVMEM-devices was
> > to
> > have a fast and uncomplicated access on partitions with sensitive
> > data,
> > especially on embedded systems. I think, there is a reasoning for
> > it,
> > but nevertheless, the original kernel patch is from 2018.
> 
> So it's a patch you carry with you and not Linux-upstream
> functionality?

Registering MTD-partitions as NVMEM devices is Linux-upstream. We just
need to adapt the partition names in barebox.

> 
> > To say the truth, there is already an upstream fix for the name-
> > clashing, which registers the NVMEM devices with the unique device
> > names, instead of the MTD-names. I had two options here, one was to
> > revert the first patch with the change for phyCore, the other was
> > to
> > follow up with the phyFLEX-module. I've chosen the latter one,
> > since I
> > felt it has more readability.
> 
> Thanks for the clarification,
> Ahmad
> 

Maybe it is better to drop this and revert the change on phyCore
instead. Prepending the device before the partition would only apply to
the NOR flash. Also, this solution doesn't work out in case there are
two flash memories of the same kind, e.g. two NOR flashes.

Please drop this patch.

Regards,
Yunus

> > 
> > Regards,
> > Yunus
> > 
> > Am Montag, dem 03.05.2021 um 14:38 +0200 schrieb Ahmad Fatoum:
> > > Hello Yunus,
> > > 
> > > On 03.05.21 14:25, Yunus Bas wrote:
> > > > The kernel NVMEM-subsystem prevents the usage of duplicate
> > > > partition names.
> > > > Change the SPI-NOR partition names to be compatible with the
> > > > kernel
> > > > driver.
> > > 
> > > I don't mind the change, but I can't follow the reasoning.
> > > These are MTD partitions, so they shouldn't have been registered
> > > with
> > > the NVMEM
> > > framework in the first place?
> > > 
> > > Cheers,
> > > Ahmad
> > > 
> > > > 
> > > > Commit 72ba815bf6fe ("ARM: dts: phycore-imx6: change mtd-
> > > > partition
> > > > names for
> > > > compatibility with kernel") applies the change for phyCORE
> > > > SOMs.
> > > > The
> > > > same applies for phyFLEX-modules.
> > > > 
> > > > Signed-off-by: Yunus Bas <y.bas at phytec.de>
> > > > ---
> > > >  arch/arm/dts/imx6qdl-phytec-pfla02.dtsi | 11 ++++++-----
> > > >  1 file changed, 6 insertions(+), 5 deletions(-)
> > > > 
> > > > diff --git a/arch/arm/dts/imx6qdl-phytec-pfla02.dtsi
> > > > b/arch/arm/dts/imx6qdl-phytec-pfla02.dtsi
> > > > index e1aa3183b..6df8d247b 100644
> > > > --- a/arch/arm/dts/imx6qdl-phytec-pfla02.dtsi
> > > > +++ b/arch/arm/dts/imx6qdl-phytec-pfla02.dtsi
> > > > @@ -21,7 +21,7 @@
> > > >  
> > > >                 environment-spinor {
> > > >                         compatible = "barebox,environment";
> > > > -                       device-path = &som_flash,
> > > > "partname:barebox-environment";
> > > > +                       device-path = &som_flash,
> > > > "partname:nor.barebox-environment";
> > > >                         status = "disabled";
> > > >                 };
> > > >  
> > > > @@ -54,28 +54,29 @@
> > > >  /delete-node/ &{/memory at 10000000};
> > > >  
> > > >  &som_flash {
> > > > +
> > > >         partitions {
> > > >                 compatible = "fixed-partitions";
> > > >                 #address-cells = <1>;
> > > >                 #size-cells = <1>;
> > > >  
> > > >                 partition at 0 {
> > > > -                       label = "barebox";
> > > > +                       label = "nor.barebox";
> > > >                         reg = <0x0 0x100000>;
> > > >                 };
> > > >  
> > > >                 partition at 100000 {
> > > > -                       label = "barebox-environment";
> > > > +                       label = "nor.barebox-environment";
> > > >                         reg = <0x100000 0x20000>;
> > > >                 };
> > > >  
> > > >                 partition at 120000 {
> > > > -                       label = "oftree";
> > > > +                       label = "nor.oftree";
> > > >                         reg = <0x120000 0x20000>;
> > > >                 };
> > > >  
> > > >                 partition at 140000 {
> > > > -                       label = "kernel";
> > > > +                       label = "nor.kernel";
> > > >                         reg = <0x140000 0x0>;
> > > >                 };
> > > >         };
> > > > 
> > > 
> > 
> 

-- 
Mit freundlichen Grüßen
Yunus Bas

-Software Engineer-
PHYTEC Messtechnik GmbH
Robert-Koch-Str. 39
55129 Mainz
Germany
Tel.: +49 (0)6131 9221- 466
Web: www.phytec.de

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