linux-kernel - Re: [PATCH 3/3] of: Handle memory@0 node on PPC32 only

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Message-ID: <20140424092642.GQ5904@bivouac.eciton.net>
Date:	Thu, 24 Apr 2014 10:26:42 +0100
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Grant Likely <grant.likely@...aro.org>,
	Mark Rutland <mark.rutland@....com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Rob Herring <robherring2@...il.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 3/3] of: Handle memory@0 node on PPC32 only

On Wed, Apr 23, 2014 at 02:10:58PM +0100, Grant Likely wrote:
> > Does anyone have a LongTrail DT to hand, and if so does the root have a
> > compatible string? From grepping through the kernel I could only find a
> > model string ("IBM,LongTrail").
> 
> Actually, on LongTrail this can be removed from the common code
> entirely. It has real open firmware and PowerPC already has the
> infrastructure for fixing up the device tree.
> 
> Here's a draft patch that I've compile tested, but nothing else.

I would certainly be happy with that.

Consider my 3/3 withdrawn.

And if the kernel proper will stop honoring nodes with no type,
there is no need for the stub to treat those specially either.

/
    Leif

> g.
> 
> ---
> 
> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index 078145acf7fb..18b2c3fee98f 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -2587,9 +2587,18 @@ static void __init fixup_device_tree_chrp(void)
>  	phandle ph;
>  	u32 prop[6];
>  	u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
> -	char *name;
> +	char *name, strprop[16];
>  	int rc;
>  
> +	/* Deal with missing device_type in LongTrail memory node */
> +	name = "/memory@0";
> +	ph = call_prom("finddevice", 1, 1, ADDR(name));
> +	rc = prom_getprop(ph, "device_type", strprop, sizeof(strprop));
> +	if (rc == PROM_ERROR || strcmp(strprop, "memory") != 0) {
> +		prom_printf("Fixing up missing device_type on /memory@0 node...\n");
> +		prom_setprop(ph, name, "device_type", "memory", sizeof("memory"));
> +	}
> +
>  	name = "/pci@...00000/isa@c";
>  	ph = call_prom("finddevice", 1, 1, ADDR(name));
>  	if (!PHANDLE_VALID(ph)) {
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 7a2ef7bb8022..7cda0d279cbe 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -886,14 +886,7 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
>  	unsigned long l;
>  
>  	/* We are scanning "memory" nodes only */
> -	if (type == NULL) {
> -		/*
> -		 * The longtrail doesn't have a device_type on the
> -		 * /memory node, so look for the node called /memory@0.
> -		 */
> -		if (depth != 1 || strcmp(uname, "memory@0") != 0)
> -			return 0;
> -	} else if (strcmp(type, "memory") != 0)
> +	if (!type || strcmp(type, "memory") != 0)
>  		return 0;
>  
>  	reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
> 
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