netdev - Re: [PATCH 3/3] stmmac: Add an optional device tree property "snps,burst

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Date:	Thu, 22 Jan 2015 09:20:25 +0100
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Sonic Zhang <sonic.adi@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>,
	<adi-buildroot-devel@...ts.sourceforge.net>,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: Re: [PATCH 3/3] stmmac: Add an optional device tree property "snps,burst_len"

On 1/22/2015 7:55 AM, Sonic Zhang wrote:
> From: Sonic Zhang <sonic.zhang@...log.com>
>
> This property define the AXI bug lenth.

Hello

I can accept this patch for now. So thx :-)

FYI, I will send a set of patches to program the AXI Bus mode
register providing more parameters from DT.

Peppe

>
> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
> ---
>   Documentation/devicetree/bindings/net/stmmac.txt   |    1 +
>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |    3 +++
>   2 files changed, 4 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index c41afd9..8ca65ce 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -43,6 +43,7 @@ Optional properties:
>     available this clock is used for programming the Timestamp Addend Register.
>     If not passed then the system clock will be used and this is fine on some
>     platforms.
> +- snps,burst_len: The AXI burst lenth value of the AXI BUS MODE register.
>
>   Examples:
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 3039de2..a20cf0d 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -234,6 +234,9 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
>   			of_property_read_bool(np, "snps,fixed-burst");
>   		dma_cfg->mixed_burst =
>   			of_property_read_bool(np, "snps,mixed-burst");
> +		of_property_read_u32(np, "snps,burst_len", &dma_cfg->burst_len);
> +		if (dma_cfg->burst_len < 0 || dma_cfg->burst_len > 256)
> +			dma_cfg->burst_len = 0;
>   	}
>   	plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
>   	if (plat->force_thresh_dma_mode) {
>

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