linux-kernel - Re: Nokia N900: Broken lirc ir-rx51 driver

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Message-ID: <20160102170657.GB12622@atomide.com>
Date:	Sat, 2 Jan 2016 09:06:57 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machel <pavel@....cz>, Nishanth Menon <nm@...com>,
	Timo Kokkonen <timo.t.kokkonen@....fi>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Nokia N900: Broken lirc ir-rx51 driver

Hi,

* Pali Rohár <pali.rohar@...il.com> [160102 06:46]:
> --- a/drivers/media/rc/ir-rx51.c
> +++ b/drivers/media/rc/ir-rx51.c
> @@ -25,9 +25,9 @@
>  #include <linux/platform_device.h>
>  #include <linux/sched.h>
>  #include <linux/wait.h>
> +#include <linux/clk.h>
>  
> -#include <plat/dmtimer.h>
> -#include <plat/clock.h>
> +#include "../../../arch/arm/plat-omap/include/plat/dmtimer.h"

Well we don't want to export the dmtimer functions to drivers..But
we now have the PWM driver that can be already used for most of the
ir-rx51.c.

>  #include <media/lirc.h>
>  #include <media/lirc_dev.h>
> @@ -208,7 +208,7 @@ static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51)
>  	}
>  
>  	clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer);
> -	lirc_rx51->fclk_khz = clk_fclk->rate / 1000;
> +	lirc_rx51->fclk_khz = clk_get_rate(clk_fclk) / 1000;
>  
>  	return 0;
>  
> 
> So Tony, you are author of that commit (a62a6e98c3) which broke ir-rx51
> module for Nokia N900. Do you know how to fix this driver for upstream
> kernel? It would be great to have driver working and not to have it in
> this dead state...

Yup please take a look at thread "[PATCH 0/3] pwm: omap: Add PWM support
using dual-mode timers". Chances are we still need to set up the dmtimer
code to provide also irqchip functions. That way ir-rx51.c can just do
request_irq on the selected dmtimer for interrupts.

> Also platform data for this driver are only in legacy board code.
> Support in DTS is missing, so driver (after fixing above problem) cannot
> be used on DT booted kernel.

Yeah those parts should be already doable with the PWM timer code AFAIK.

Regards,

Tony


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