linux-kernel - Re: [PATCH v3 2/5] pinctrl: st: Enhance the controller to manage unavailable registers

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Message-ID: <20140311111326.GB21216@lee--X1>
Date:	Tue, 11 Mar 2014 11:13:26 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Maxime Coquelin <maxime.coquelin@...com>
Cc:	Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
	Russell King <linux@....linux.org.uk>, kernel@...inux.com,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	Rob Landley <rob@...dley.net>,
	Kumar Gala <galak@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/5] pinctrl: st: Enhance the controller to manage
 unavailable registers

> >>>From: Giuseppe Cavallaro <peppe.cavallaro@...com>
> >>>
> >>>This patch adds a new logic inside the st pinctrl to manage
> >>>an unsupported scenario: some sysconfig are not available!
> >>>
> >>>This is the case of STiH407 where, although documented, the
> >>>following registers from SYSCFG_FLASH have been removed from the SoC.
> >>>
> >>>SYSTEM_CONFIG3040
> >>>    Output Enable pad control for all PIO Alternate Functions
> >>>and
> >>>SYSTEM_ CONFIG3050
> >>>    Pull Up pad control for all PIO Alternate Functions
> >>>
> >>>Without managing this condition an imprecise external abort
> >>>will be detect.
> >>>
> >>>To do this the patch also reviews the st_parse_syscfgs
> >>>and other routines to manipulate the registers only if
> >>>actually available.
> >>>In any case, for example the st_parse_syscfgs detected
> >>>an error condition but no action was made in the
> >>>st_pctl_probe_dt.
> >>>
> >>>Signed-off-by: Maxime Coquelin <maxime.coquelin@...com>
> >>>Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
> >>>+
> >>>+static struct regmap_field *st_pc_get_value(struct device *dev,
> >>>+                        struct regmap *regmap, int bank,
> >>>+                        int data, int lsb, int msb)
> >>>+{
> >>>+    struct reg_field reg = REG_FIELD((data + bank) * 4, lsb, msb);
> >>>+
> >>>+    if (data < 0)
> >>>+        return NULL;
> >>
> >>What happens is data < 0 and it's used in REG_FIELD?
> >Nothing bad, but I agree this is not crystal clear.
> >
> >>Would it make more sense to make this check before calling REG_FIELD?
> >Yes, it will be done in the v4.
> 
> Finally, I have to keep it as it was if I want this patch to compile.

Ah, why's that?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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