linux-kernel - Re: [PATCH v6] mfd: syscon: Add hardware spinlock support

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Date:   Tue, 19 Dec 2017 09:21:49 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6] mfd: syscon: Add hardware spinlock support

On Tue, Dec 19, 2017 at 02:55:47PM +0800, Baolin Wang wrote:

> Um, why regmap doesn't accept a zero lock-id, that because regmap will
> reguest hwlock depending on the 'regmap_config->hwlock_id' is not
> zero, if regmap regard a zero lock-id as valid which will affect other
> 'struct regmap_config' definition. So users should not assign the zero
> lock-id to regmap.

> Now of_hwspin_lock_get_id() can return 0 as valid, which depend on
> what is the base id registered by hwspinlock driver. So you think we
> should not regard 0 as valid from of_hwspin_lock_get_id(), I can try
> to send another patch to fix.

If 0 is a valid hwspinlock ID you need to add a flag to the regmap
config to say if a hwspinlock should be used.  That way we're not
rejecting valid values.

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