linux-kernel - Re: [PATCH v2] ARC: Configure APB GPIO controller on ARC HSDK platform

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Message-ID: <1b200ba226f7e509049f0ffbf4478ca0d80a67b0.camel@synopsys.com>
Date:   Fri, 6 Jul 2018 16:35:21 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>
CC:     "robh@...nel.org" <robh@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "eugeniy.paltsev@...opsys.com" <eugeniy.paltsev@...opsys.com>,
        "sboyd@...eaurora.org" <sboyd@...eaurora.org>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "joao.pinto@...opsys.com" <joao.pinto@...opsys.com>
Subject: Re: [PATCH v2] ARC: Configure APB GPIO controller on ARC HSDK
 platform

Hi Gustavo,

On Fri, 2018-07-06 at 11:32 +0100, Gustavo Pimentel wrote:
> In case of HSDK we have intermediate INTC in for of DW APB GPIO controller
> which is used as a de-bounce logic for interrupt wires that come from
> outside the board.
> 
> We cannot use existing "irq-dw-apb-ictl" driver here because all input
> lines are routed to corresponding output lines but not muxed into one
> line (this is configured in RTL and we cannot change this in software).
> 
> But even if we add such a feature to "irq-dw-apb-ictl" driver that won't
> benefit us as higher-level INTC (in case of HSDK it is IDU) anyways has
> per-input control so adding fully-controller intermediate INTC will only
> bring some overhead on interrupt processing but no other benefits.
> 
> Thus we just do one-time configuration of DW APB GPIO controller and
> forget about it.
> 
> Based on implementation available on arch/arc/plat-axs10x/axs10x.c file.
> 
> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>

Acked-by: Alexey Brodkin <abrodkin@...opsys.com>