From mboxrd@z Thu Jan  1 00:00:00 1970
From: tony@atomide.com (Tony Lindgren)
Date: Thu, 17 Jul 2014 23:24:56 -0700
Subject: [PATCH 5/5] tty: serial: Add 8250-core based omap driver
In-Reply-To: <53C7A01C.50107@linutronix.de>
References: <1405521903-5877-1-git-send-email-bigeasy@linutronix.de>
 <1405521903-5877-6-git-send-email-bigeasy@linutronix.de>
 <20140717070859.GD18374@atomide.com>
 <20140717074219.GA29193@linutronix.de>
 <20140717081232.GH18374@atomide.com> <53C7A01C.50107@linutronix.de>
Message-ID: <20140718062456.GJ18374@atomide.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

* Sebastian Andrzej Siewior <bigeasy@linutronix.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