linux-kernel - Re: [PATCH 5/5] tty: serial: Add 8250-core based omap driver

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Date:	Thu, 17 Jul 2014 23:24:56 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 5/5] tty: serial: Add 8250-core based omap driver

* Sebastian Andrzej Siewior <bigeasy@...utronix.de> [140717 03:09]:
> On 07/17/2014 10:12 AM, Tony Lindgren wrote:
> > Hmm it could be that it works for a while because the clocks are on
> > from the bootloader and pm_runtime calls won't do anything. This
> > could happen if the interconnect data based on the ti,hwmods entry
> > is not getting matched to the new driver. This gets initialized when
> > the device entry gets created in omap_device_build_from_dt().
> > 
> > Or maybe something now affects the clock aliases? It seems that we
> > are still missing the clocks entries in the .dtsi files, see the
> > mappings with $ git grep uart drivers/clk/ti/
> 
> I've been looking for something completely different while I noticed
> this:
> 
> in drivers/tty/serial/omap-serial.c
> | static struct platform_driver serial_omap_driver = {
> |         .driver         = {
> |                 .name   = DRIVER_NAME,
> |         },
> | };
> |
> 
> and DRIVER_NAME should come from include/linux/platform_data/serial-omap.h
> Looking further, I've found arch/arm/mach-omap2/serial.c:
> | void __init omap_serial_init_port(struct omap_board_data *bdata,
> |                         struct omap_uart_port_info *info)
> | {
> |         char *name
> …
> |	name = DRIVER_NAME;
> …
> |	pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size);
> …
> |
> 
> Would this explain it?

That would explain it for legacy booting, but not for device tree
based booting. I can try to debug it further on Monday.

Regards,

Tony
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