linux-kernel - Re: [PATCH] mux: mmio: Do not use syscon helper to build regmap

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Message-ID: <2025012446-unturned-frugality-7a20@gregkh>
Date: Fri, 24 Jan 2025 06:26:16 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Nishanth Menon <nm@...com>
Cc: Andrew Davis <afd@...com>, Peter Rosin <peda@...ntia.se>,
	Vignesh Raghavendra <vigneshr@...com>, linux-kernel@...r.kernel.org,
	"Rob Herring (Arm)" <robh@...nel.org>, Lee Jones <lee@...nel.org>
Subject: Re: [PATCH] mux: mmio: Do not use syscon helper to build regmap

On Thu, Jan 23, 2025 at 02:04:12PM -0600, Nishanth Menon wrote:
> On 12:20-20250123, Andrew Davis wrote:
> > The syscon helper device_node_to_regmap() is used to fetch a regmap
> > registered to a device node. It also currently creates this regmap
> > if the node did not already have a regmap associated with it. This
> > should only be used on "syscon" nodes. This driver is not such a
> > device and instead uses device_node_to_regmap() on its own node as
> > a hacky way to create a regmap for itself.
> > 
> > This will not work going forward and so we should create our regmap
> > the normal way by defining our regmap_config, fetching our memory
> > resource, then using the normal regmap_init_mmio() function.
> > 
> > Signed-off-by: Andrew Davis <afd@...com>
> > ---
> Tested-by: Nishanth Menon <nm@...com>
> 
> Greg, Peter,
> 
> This is part of the fixes TI K3 platforms boot issues reported in
> https://lore.kernel.org/all/b2413460-ec8b-4c77-99b8-4c32b262439a@ti.com/
> on the latest linus master v6.13-5001-gd0d106a2bd21 + linux
> next-20250123
> 
> Total set of patches tested with:
> https://lore.kernel.org/all/20250119182121.3956546-1-vaishnav.a@ti.com/
> https://lore.kernel.org/r/20250123181726.597144-1-afd@ti.com
> https://lore.kernel.org/r/20250123181913.597304-1-afd@ti.com
> https://lore.kernel.org/r/20250123182059.597491-1-afd@ti.com
> https://lore.kernel.org/r/20250123182234.597665-1-afd@ti.com
> 
> Could we get this routed to master as fixes asap please to get a sane 6.14?

Our trees are of course closed right now due to the merge window, you
know that :)

So we can take things after -rc1 is out, and route bugfixes for
6.14-final and new stuff for 6.15-rc1, like always.  It's hard to see
that this is just a bugfix, but if it is, it needs a Fixes: tag at the
very least, right?

thanks,

greg k-h