linux-kernel - Re: [PATCH v2 3/3] ARM: orion5x: Add D-Link DNS-323 based on Device Tree

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Message-ID: <f6a27b077f8b595e9c74152f1fa3c780@ext.kapsi.fi>
Date:   Fri, 23 Sep 2022 12:13:24 +0300
From:   maukka@....kapsi.fi
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org, Olof Johansson <olof@...om.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Russell King <linux@...linux.org.uk>,
        Pali Rohár <pali@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/3] ARM: orion5x: Add D-Link DNS-323 based on Device
 Tree

On 23.9.2022 00:39, Arnd Bergmann wrote:
> On Thu, Sep 22, 2022, at 10:24 PM, Mauri Sandberg wrote:
>> +
>> +/* dns323_parse_hex_*() taken from tsx09-common.c; should a common
>> copy of these
>> + * functions be kept somewhere?
>> + */
>> +static int __init dns323_parse_hex_nibble(char n)
>> +{
>> +	if (n >= '0' && n <= '9')
>> +		return n - '0';
>> +
>> +	if (n >= 'A' && n <= 'F')
>> +		return n - 'A' + 10;
>> +
>> +	if (n >= 'a' && n <= 'f')
>> +		return n - 'a' + 10;
>> +
>> +	return -1;
>> +}
>> +
>> +static int __init dns323_parse_hex_byte(const char *b)
>> +{
>> +	int hi;
>> +	int lo;
>> +
>> +	hi = dns323_parse_hex_nibble(b[0]);
>> +	lo = dns323_parse_hex_nibble(b[1]);
>> +
>> +	if (hi < 0 || lo < 0)
>> +		return -1;
>> +
>> +	return (hi << 4) | lo;
>> +}
>> +
> 
> Can you use simple_strntoull() to parse the address into a u64 instead?
> 
Nice idea. Its current replacement seems to be kstrtoull(). I'll have to 
do
it byte by byte, right? Or what do you have in mind with 64bit unsigned?

>> +static int __init dns323_read_mac_addr(u8 *addr)
>> +{
>> +	int i;
>> +	char *mac_page;
>> +
>> +	/* MAC address is stored as a regular ol' string in /dev/mtdblock4
>> +	 * (0x007d0000-0x00800000) starting at offset 196480 (0x2ff80).
>> +	 */
>> +	mac_page = ioremap(DNS323_NOR_BOOT_BASE + 0x7d0000 + 196480, 1024);
>> +	if (!mac_page)
>> +		return -ENOMEM;
> 
> It would be nicer to use of_iomap() on the nor device than a
> hardcoded physical address here, at least if that doesn't add
> too much extra complexity.
> 

I'll look into this.