linux-kernel - Re: [PATCH] mfd: qcom-spmi-pmic: Don't access non-existing registers

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Message-ID: <20160111055000.GK3331@x1>
Date:	Mon, 11 Jan 2016 05:50:00 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mfd: qcom-spmi-pmic: Don't access non-existing registers

On Tue, 17 Nov 2015, Stephen Boyd wrote:

> From: "Ivan T. Ivanov" <ivan.ivanov@...aro.org>
> 
> Revision ID registers are available only on devices with
> Slave IDs that are even, so don't make access to unavailable
> registers.
> 
> Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
> [sboyd@...eaurora.org: Consider all slave ids that are even]
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  drivers/mfd/qcom-spmi-pmic.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Applied, thanks.

> diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c
> index af6ac1c4b45c..8653e8b9bb4f 100644
> --- a/drivers/mfd/qcom-spmi-pmic.c
> +++ b/drivers/mfd/qcom-spmi-pmic.c
> @@ -127,7 +127,9 @@ static int pmic_spmi_probe(struct spmi_device *sdev)
>  	if (IS_ERR(regmap))
>  		return PTR_ERR(regmap);
>  
> -	pmic_spmi_show_revid(regmap, &sdev->dev);
> +	/* Only the first slave id for a PMIC contains this information */
> +	if (sdev->usid % 2 == 0)
> +		pmic_spmi_show_revid(regmap, &sdev->dev);
>  
>  	return of_platform_populate(root, NULL, NULL, &sdev->dev);
>  }

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