Re: [PATCH 08/11] misc: rp1: RaspberryPi RP1 misc driver

On Fri, Aug 30, 2024 at 03:49:04PM +0200, Andrea della Porta wrote:

Hi Krzysztof,

On 10:38 Wed 21 Aug     , Krzysztof Kozlowski wrote:

quoted

On Tue, Aug 20, 2024 at 04:36:10PM +0200, Andrea della Porta wrote:

quoted

The RaspberryPi RP1 is ia PCI multi function device containing
peripherals ranging from Ethernet to USB controller, I2C, SPI
and others.
Implement a bare minimum driver to operate the RP1, leveraging
actual OF based driver implementations for the on-borad peripherals
by loading a devicetree overlay during driver probe.
The peripherals are accessed by mapping MMIO registers starting
from PCI BAR1 region.
As a minimum driver, the peripherals will not be added to the
dtbo here, but in following patches.

Link: https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
 MAINTAINERS                           |   2 +
 arch/arm64/boot/dts/broadcom/rp1.dtso | 152 ++++++++++++

Do not mix DTS with drivers.

These MUST be separate.

Separating the dtso from the driver in two different patches would mean
that the dtso patch would be ordered before the driver one. This is because
the driver embeds the dtbo binary blob inside itself, at build time. So
in order to build the driver, the dtso needs to be there also. This is not
the standard approach used with 'normal' dtb/dtbo, where the dtb patch is
ordered last wrt the driver it refers to.
Are you sure you want to proceed in this way?

It is more about they are logically separate things. The .dtb/dtbo
describes the hardware. It should be possible to review that as a
standalone thing. The code them implements the binding. It makes no
sense to review the code until the binding is correct, because changes
to the binding will need changes to the code. Hence, we want the
binding first, then the code which implements it.

	Andrew