linux-kernel - Re: [PATCHv2 2/9] hwspinlock/omap: add support for dt nodes

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Message-Id: <AE597DCC-83D7-4BCD-8990-3D63540F32EA@codeaurora.org>
Date:	Fri, 27 Sep 2013 11:06:38 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Suman Anna <s-anna@...com>
Cc:	Ohad Ben-Cohen <ohad@...ery.com>, Tony Lindgren <tony@...mide.com>,
	Benoit Cousson <bcousson@...libre.com>,
	Paul Walmsley <paul@...an.com>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCHv2 2/9] hwspinlock/omap: add support for dt nodes


On Sep 17, 2013, at 2:30 PM, Suman Anna wrote:

> HwSpinlock IP is present only on OMAP4 and other newer SoCs,
> which are all device-tree boot only. This patch adds the
> base support for parsing the DT nodes, and removes the code
> dealing with the traditional platform device instantiation.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> ---
> .../devicetree/bindings/hwlock/omap-hwspinlock.txt | 31 +++++++++++
> arch/arm/mach-omap2/Makefile                       |  3 --
> arch/arm/mach-omap2/hwspinlock.c                   | 60 ----------------------
> drivers/hwspinlock/omap_hwspinlock.c               | 23 +++++++--
> 4 files changed, 50 insertions(+), 67 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
> delete mode 100644 arch/arm/mach-omap2/hwspinlock.c
> 
> diff --git a/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
> new file mode 100644
> index 0000000..235b7c5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
> @@ -0,0 +1,31 @@
> +OMAP4+ HwSpinlock Driver
> +========================
> +
> +Required properties:
> +- compatible:		Currently supports only "ti,omap4-hwspinlock" for
> +				OMAP44xx, OMAP54xx, AM33xx, AM43xx, DRA7xx SoCs
> +- reg:			Contains the hwspinlock register address range (base
> +			address and length)
> +- ti,hwmods:		Name of the hwmod associated with the hwspinlock device
> +
> +Common hwlock properties:
> +The following describes the usage of the common hwlock properties (defined in
> +Documentation/devicetree/bindings/hwlock/hwlock.txt) on OMAP.
> +
> +- hwlock-base-id:	There are currently no OMAP SoCs with multiple
> +			hwspinlock devices. The OMAP driver uses a default
> +			base id value of 0 for the locks present within the
> +			single hwspinlock device on all SoCs.
> +- hwlock-num-locks:	This property is not required on OMAP SoCs, since the
> +			number of locks present within a device can be deduced
> +			from the SPINLOCK_SYSSTATUS device register.

If you are going to be explicit about this properties, you should probably be a bit more clear about them NOT being in the OMAP dts because of the reasons you specify.

> +
> +
> +Example:
> +
> +/* OMAP4 */
> +hwspinlock: spinlock@...f6000 {
> +	compatible = "ti,omap4-hwspinlock";
> +	reg = <0x4a0f6000 0x1000>;
> +	ti,hwmods = "spinlock";
> +};

- k

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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