linux-kernel - Re: [PATCH 2/2] arm: socfpga: Add support for Altera SoC SDRAM controller

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Date:	Tue, 1 Apr 2014 07:33:43 +0200
From:	Steffen Trumtrar <s.trumtrar@...gutronix.de>
To:	tthayer@...era.com
Cc:	dinguyen@...era.com, rob.herring@...xeda.com, pawel.moll@....com,
	mark.rutland@....com, devicetree@...lion.org.uk,
	galak@...eaurora.org, rob@...dley.net, linux@....linux.org.uk,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/2] arm: socfpga: Add support for Altera SoC SDRAM
 controller

On Mon, Mar 31, 2014 at 05:07:07PM -0500, tthayer@...era.com wrote:
> From: Thor Thayer <tthayer@...era.com>
> 
> Addition of the Altera SDRAM controller registers to the
> Altera SoC project. These registers are shared by future
> drivers such as ECC and the FPGA bridge.
> 
> Signed-off-by: Thor Thayer <tthayer@...era.com>
> To: Rob Herring <rob.herring@...xeda.com>
> To: Pawel Moll <pawel.moll@....com>
> To: Mark Rutland <mark.rutland@....com>
> To: Ian Campbell <ijc+devicetree@...lion.org.uk>
> To: Kumar Gala <galak@...eaurora.org>
> To: Rob Landley <rob@...dley.net>
> To: Russell King <linux@....linux.org.uk>
> To: Dinh Nguyen <dinguyen@...era.com>
> Cc: devicetree@...r.kernel.org
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>  arch/arm/mach-socfpga/socfpga.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
> index 21d6026..d514e8a 100644
> --- a/arch/arm/mach-socfpga/socfpga.c
> +++ b/arch/arm/mach-socfpga/socfpga.c
> @@ -32,6 +32,7 @@
>  void __iomem *socfpga_scu_base_addr = ((void __iomem *)(SOCFPGA_SCU_VIRT_BASE));
>  void __iomem *sys_manager_base_addr;
>  void __iomem *rst_manager_base_addr;
> +void __iomem *sdr_ctl_base_addr;
>  void __iomem *clk_mgr_base_addr;
>  unsigned long cpu1start_addr;
>  

Can't we get rid of all these global pointers instead of adding to them?

> @@ -150,6 +151,15 @@ void __init socfpga_sysmgr_init(void)
>  
>  	np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr");
>  	clk_mgr_base_addr = of_iomap(np, 0);
> +
> +	np = of_find_compatible_node(NULL, NULL, "altr,sdr-ctl");
> +	if (!np) {
> +		pr_err("SOCFPGA: Unable to find sdr-ctl\n");
> +		return;
> +	}
> +
> +	sdr_ctl_base_addr = of_iomap(np, 0);
> +	WARN_ON(!sdr_ctl_base_addr);
>  }
>  
>  static void __init socfpga_init_irq(void)
> -- 
> 1.7.9.5
> 

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