linux-kernel - Re: [PATCH 1/2] hwspinlock/omap: add support for dt nodes

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Message-Id: <43798031-2D57-44F0-A19C-FD80DB9E9794@codeaurora.org>
Date:	Tue, 3 Sep 2013 13:50:53 -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>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] hwspinlock/omap: add support for dt nodes


On Sep 3, 2013, at 12:52 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 | 28 ++++++++++
> arch/arm/mach-omap2/Makefile                       |  3 --
> arch/arm/mach-omap2/hwspinlock.c                   | 60 ----------------------
> drivers/hwspinlock/omap_hwspinlock.c               | 21 ++++++--
> 4 files changed, 45 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..adfb8ad
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwlock/omap-hwspinlock.txt
> @@ -0,0 +1,28 @@
> +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
> +
> +Optional properties:
> +- base_id:		Base Id for the locks for a particular hwspinlock
> +			device. If not mentioned, a default value of 0 is used.
> +			This property is mandatory ONLY if a SoC has several
> +			hwspinlock devices. There are currently no such OMAP
> +			SoCs.

Should this be ti,base_id ? [ I know its kinda generic in its intent for any SoC w/multiple blocks ]

> +
> +			See documentation on struct hwspinlock_pdata in
> +			linux/hwspinlock.h for more details.
> +
> +
> +Example:
> +
> +/* OMAP4 */
> +hwspinlock: spinlock@...f6000 {
> +	compatible = "ti,omap4-hwspinlock";
> +	reg = <0x4a0f6000 0x1000>;
> +	ti,hwmods = "spinlock";
> +};

[ snip ]

- 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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