linux-kernel - Re: [PATCH RESEND v2 1/4] mfd: intel_soc

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Date:	Tue, 27 May 2014 12:20:24 +0100
From:	Mark Brown <broonie@...nel.org>
To:	"Zhu, Lejun" <lejun.zhu@...ux.intel.com>
Cc:	lee.jones@...aro.org, sameo@...ux.intel.com,
	linux-kernel@...r.kernel.org, jacob.jun.pan@...ux.intel.com,
	bin.yang@...el.com
Subject: Re: [PATCH RESEND v2 1/4] mfd: intel_soc_pmic: Core driver

On Tue, May 27, 2014 at 08:48:58AM +0800, Zhu, Lejun wrote:
> On 5/26/2014 10:51 PM, Mark Brown wrote:

> >> We created these names to hide the implementation of how read/write is
> >> done from other platform specific patches interacting with this driver.
> >> So when we change the implementation, e.g. from I2C read/write to
> >> regmap, we don't have to touch all these patches.

> > This sort of HAL is frowned upon in the upstream kernel.

> We want to do what other MFD drivers' been doing, and make it easier for
> the callers. A couple of similar examples are intel_msic_reg_read() and
> lp3943_read_byte(). We want to do the same with intel_soc_pmic_readb(),
> and I don't think it's too odd.

The odd and problematic bit is the global variable part of things -
these wrappers are usually just doing lookup of the underlying I/O
handle in the struct for the device and can be implemented as static
inlines in the header.

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