linux-kernel - Re: [PATCH] Add initial SX3000b platform code to MIPS arch

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Date:   Wed, 22 Mar 2017 13:36:41 +0100
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Amit Kama IL <Amit.Kama@...ixfy.com>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "marc.zyngier@....com" <marc.zyngier@....com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "corbet@....net" <corbet@....net>
Subject: Re: [PATCH] Add initial SX3000b platform code to MIPS arch

On Wed, Mar 22, 2017 at 05:38:09AM +0000, Amit Kama IL wrote:

> Add initial support for boards based on Satixfy's SX3000b (Catniss) SoC.
> The SoC includes a MIPS interAptiv dual core 4 VPE processor and boots 
> using device-tree.
> 
> Signed-off-by: Amit Kama <amit.kama@...ixfy.com>
> 
> The irqchip file (irq-sx3000b.c) is pertinent to the platform. 
> IRQCHIP maintainers - is it possible to merge this through MIPS tree? 


First thig, run your patch through scripts/checkpatch.pl and fix the
resulting pile of errors and warnings.

sx3000_machine_halt() will consume plenty of power if implemented as a
empty loop:

+static void sx3000_machine_halt(void)
+{
+       while (true);
+}

Something like:

static void sx3000_machine_halt(void)
{
	local_irq_disable();
	while (1) {
		if (cpu_wait)
			cpu_wait();
	}
}

will make the function much "greener".

  Ralf