linux-kernel - Re: [RFC PATCH 2/3] soc: ti: Add wkup_m3

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Date:	Wed, 26 Nov 2014 22:51:50 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Dave Gerlach <d-gerlach@...com>, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Paul Walmsley <paul@...an.com>,
	Kevin Hilman <khilman@...aro.org>,
	Tony Lindgren <tony@...mide.com>,
	Benoit Cousson <bcousson@...libre.com>
Subject: Re: [RFC PATCH 2/3] soc: ti: Add wkup_m3_ipc driver

On Wednesday 26 November 2014 15:38:09 Dave Gerlach wrote:
> +
> +static const struct wkup_m3_wakeup_src wakeups[] = {
> +       {.irq_nr = 35,  .src = "USB0_PHY"},
> +       {.irq_nr = 36,  .src = "USB1_PHY"},
> +       {.irq_nr = 40,  .src = "I2C0"},
> +       {.irq_nr = 41,  .src = "RTC Timer"},
> +       {.irq_nr = 42,  .src = "RTC Alarm"},
> +       {.irq_nr = 43,  .src = "Timer0"},
> +       {.irq_nr = 44,  .src = "Timer1"},
> +       {.irq_nr = 45,  .src = "UART"},
> +       {.irq_nr = 46,  .src = "GPIO0"},
> +       {.irq_nr = 48,  .src = "MPU_WAKE"},
> +       {.irq_nr = 49,  .src = "WDT0"},
> +       {.irq_nr = 50,  .src = "WDT1"},
> +       {.irq_nr = 51,  .src = "ADC_TSC"},
> +       {.irq_nr = 0,   .src = "Unknown"},
> +};
> 

This seems awfully specific to some SoC version, and not aware of
IRQ domains. It also seems to be only used in a dev_dbg statement,
so I guess you could just kill this off entirely.

> +static struct rproc *wkup_m3_get_rproc(struct device *dev)
> +{
> +       struct device_node *node;
> +       struct rproc *rp;
> +
> +       node = of_parse_phandle(dev->of_node, "ti,rproc", 0);
> +       if (!node)
> +               return NULL;
> +
> +       dev = bus_find_device(&platform_bus_type, NULL, node, match);
> +       if (!dev)
> +               return NULL;
> +
> +       rp = dev_get_drvdata(dev);
> +       return rp;

This is wrong on a number of levels. I suspect what you really want
is an interface exported from drivers/remoteproc that looks up
a 'struct rproc' and performs the necessary reference counting.

That one can just use of_find_node_by_phandle() to get to
a device_node and use that to look up the rproc device in
a linked list it maintains.

	Arnd
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