linux-kernel - Re: [PATCH v8 2/4] misc: Generic on-chip SRAM allocation driver

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Date:	Fri, 08 Feb 2013 20:16:34 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Richard Zhao <richard.zhao@...escale.com>,
	Huang Shijie <shijie8@...il.com>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Matt Porter <mporter@...com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Javier Martin <javier.martin@...ta-silicon.com>,
	kernel@...gutronix.de, devicetree-discuss@...ts.ozlabs.org,
	Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v8 2/4] misc: Generic on-chip SRAM allocation driver

On Mon,  4 Feb 2013 12:32:16 +0100, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> This driver requests and remaps a memory region as configured in the
> device tree. It serves memory from this region via the genalloc API.
> It optionally enables the SRAM clock.
> 
> Other drivers can retrieve the genalloc pool from a phandle pointing
> to this drivers' device node in the device tree.
> 
> The allocation granularity is hard-coded to 32 bytes for now,
> to make the SRAM driver useful for the 6502 remoteproc driver.
> There is overhead for bigger SRAMs, where only a much coarser
> allocation granularity is needed: At 32 bytes minimum allocation
> size, a 256 KiB SRAM needs a 1 KiB bitmap to track allocations.
> 
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> Reviewed-by: Shawn Guo <shawn.guo@...aro.org>
> ---
> Changes since v7:
>  - Removed obsolete __devinit/__devexit/__devexit_p
> ---
>  Documentation/devicetree/bindings/misc/sram.txt |   17 ++++
>  drivers/misc/Kconfig                            |    9 ++
>  drivers/misc/Makefile                           |    1 +
>  drivers/misc/sram.c                             |  121 +++++++++++++++++++++++
>  4 files changed, 148 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/sram.txt
>  create mode 100644 drivers/misc/sram.c
> 
> diff --git a/Documentation/devicetree/bindings/misc/sram.txt b/Documentation/devicetree/bindings/misc/sram.txt
> new file mode 100644
> index 0000000..b64136c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/sram.txt
> @@ -0,0 +1,17 @@
> +Generic on-chip SRAM
> +
> +Simple IO memory regions to be managed by the genalloc API.
> +
> +Required properties:
> +
> +- compatible : sram

I'm a little concerned that 'sram' is just too generic for a compatible
value and we may end up needing a blacklist of systems where the sram
device should not be driven with this driver. If you can think of
a more descriptive name here then I would use it.

However, I'm not worried about it enough to nak it and the rest of the
series looks fine.

Acked-by: Grant Likely <grant.likely@...retlab.ca>
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