linux-kernel - Re: [PATCH v2] hwspinlock/msm: Add support for Qualcomm MSM HW Mutex block

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Date:	Fri, 29 Aug 2014 16:41:29 -0700
From:	Courtney Cavin <courtney.cavin@...ymobile.com>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
CC:	Ohad Ben-Cohen <ohad@...ery.com>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Suman Anna <s-anna@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Jeffrey Hugo <jhugo@...eaurora.org>,
	Eric Holmberg <eholmber@...eaurora.org>
Subject: Re: [PATCH v2] hwspinlock/msm: Add support for Qualcomm MSM HW Mutex
 block

On Sat, Aug 30, 2014 at 01:14:23AM +0200, Bjorn Andersson wrote:
> From: Kumar Gala <galak@...eaurora.org>
> 
> Add driver for Qualcomm MSM Hardware Mutex block that exists on
> newer Qualcomm SoCs.
> 
> Cc: Jeffrey Hugo <jhugo@...eaurora.org>
> Cc: Eric Holmberg <eholmber@...eaurora.org>
> Cc: Courtney Cavin <courtney.cavin@...ymobile.com>
> Signed-off-by: Kumar Gala <galak@...eaurora.org>
> [bjorn: added pm_runtime calls, from Courtney,
> 	added sfpb-mutex compatible,
> 	updated DT binding documentation formatting]
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
[...]
> diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig
> index 3612cb5..2cd39e2 100644
> --- a/drivers/hwspinlock/Kconfig
> +++ b/drivers/hwspinlock/Kconfig
> @@ -8,6 +8,17 @@ config HWSPINLOCK
>  
>  menu "Hardware Spinlock drivers"
>  
> +config HWSPINLOCK_MSM
> +	tristate "MSM Hardware Spinlock device"
> +	depends on ARCH_QCOM

This should also depend on OF, as it won't compile or work without it.

> +	select HWSPINLOCK
> +	help
> +	  Say y here to support the MSM Hardware Mutex functionality, which
> +	  provides a synchronisation mechanism for the various processors on
> +	  the SoC.
> +
> +	  If unsure, say N.
> +
>  config HWSPINLOCK_OMAP
>  	tristate "OMAP Hardware Spinlock device"
>  	depends on ARCH_OMAP4 || SOC_OMAP5 || SOC_DRA7XX || SOC_AM33XX || SOC_AM43XX
[...]
> +static const struct of_device_id msm_hwspinlock_of_match[] = {
> +	{ .compatible = "qcom,sfpb-mutex", .data = (void *)0x4 },
> +	{ .compatible = "qcom,tcsr-mutex", .data = (void *)0x80 },
> +	{ },
> +};

MODULE_DEVICE_TABLE(of, msm_hwspinlock_of_match); ?

[...]
> +static struct platform_driver msm_hwspinlock_driver = {
> +	.probe		= msm_hwspinlock_probe,
> +	.remove		= msm_hwspinlock_remove,
> +	.driver		= {
> +		.name	= "msm_hwspinlock",
> +		.owner	= THIS_MODULE,

No need, as:

#define platform_driver_register(drv) \
	__platform_driver_register(drv, THIS_MODULE)
extern int __platform_driver_register(struct platform_driver *,
					struct module *);

> +		.of_match_table = msm_hwspinlock_of_match,
> +	},
> +};

Otherwise, looks fine.

-Courtney
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