linux-kernel - Re: [PATCH v2] can: xilinx CAN controller support.

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Date:	Fri, 14 Feb 2014 10:04:36 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	monstr@...str.eu
CC:	Kedareswara rao Appana <appana.durga.rao@...inx.com>,
	wg@...ndegger.com, michal.simek@...inx.com,
	grant.likely@...aro.org, robh+dt@...nel.org,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH v2] can: xilinx CAN controller support.

On 02/14/2014 09:55 AM, Michal Simek wrote:
> Hi Marc,
> 
>>> +	int waiting_ech_skb_num;
>>> +	int xcan_echo_skb_max_tx;
>>> +	int xcan_echo_skb_max_rx;
>>> +	struct napi_struct napi;
>>> +	spinlock_t ech_skb_lock;
>>> +	u32 (*read_reg)(const struct xcan_priv *priv, int reg);
>>> +	void (*write_reg)(const struct xcan_priv *priv, int reg, u32 val);
>>
>> Please remove read_reg, write_reg, as long as there isn't any BE support
>> in the driver, call them directly.
> 
> That's not entirely truth. If you look at Microblaze then you will see
> that Microblaze can be BE and LE.
> There is just missing endian detection which we will add to the next version.

As far as I know the endianess of the kernel is fixed and known during
compile time. Correct me if I'm wrong. So there is no need for a runtime
detection of the endianess and so no need for {read,write}_reg function
pointers.

> But because MB io helper functions are broken for a while you should be
> able to use this driver on both endianess.
> 
> btw: I would prefer to use ioread32 and ioread32be instead of readl.
> Is it OK for you?

Make it so. :)

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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