Also add eeprom 93cx6 to generic-2.6
[openwrt/svn-archive/archive.git] / target / linux / generic-2.6 / patches / 002-eeprom_93cx6.patch
1 From: John W. Linville <linville@tuxdriver.com>
2 Date: Tue, 12 Jun 2007 01:37:46 +0000 (-0400)
3 Subject: [PATCH] eeprom_93cx6: shorten pulse timing to match spec
4 X-Git-Tag: v2.6.23-rc1~1201^2~71
5 X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=7e9400f178d291b2208c4ed9aac0f425c1364000
6
7 [PATCH] eeprom_93cx6: shorten pulse timing to match spec
8
9 93cx6 datasheet available here:
10
11 http://ww1.microchip.com/downloads/en/DeviceDoc/21749F.pdf
12
13 Figure 1-1 and Table 1-2 on pages 4-5 indicate that both Clock High
14 Time and Clock Low Time have largest minimum times of 450ns.
15
16 Signed-off-by: John W. Linville <linville@tuxdriver.com>
17 ---
18
19 diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
20 index 0d6d742..ac515b0 100644
21 --- a/drivers/misc/eeprom_93cx6.c
22 +++ b/drivers/misc/eeprom_93cx6.c
23 @@ -42,10 +42,10 @@ static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
24
25 /*
26 * Add a short delay for the pulse to work.
27 - * According to the specifications the minimal time
28 - * should be 450ns so a 1us delay is sufficient.
29 + * According to the specifications the "maximum minimum"
30 + * time should be 450ns.
31 */
32 - udelay(1);
33 + ndelay(450);
34 }
35
36 static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)