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117 lines
4.0 KiB
Diff
117 lines
4.0 KiB
Diff
From: Ivo van Doorn <ivdoorn@gmail.com>
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Date: Mon, 14 May 2007 21:06:01 +0000 (+0200)
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Subject: [PATCH] eeprom_93cx6: Add comment for 1us delay after pulse
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X-Git-Tag: v2.6.23-rc1~1201^2~73
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=4b914dc0493edff19ff698a18198a173a14ba9d2
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[PATCH] eeprom_93cx6: Add comment for 1us delay after pulse
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This will add a comment for the 1us delay which is taken
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after the pulse has been switched. The 1us delay is based
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on the specifications so that should be made clear.
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Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
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Signed-off-by: John W. Linville <linville@tuxdriver.com>
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---
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diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
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index bfcb434..0d6d742 100644
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--- a/drivers/misc/eeprom_93cx6.c
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+++ b/drivers/misc/eeprom_93cx6.c
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@@ -39,6 +39,12 @@ static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
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{
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eeprom->reg_data_clock = 1;
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eeprom->register_write(eeprom);
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+
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+ /*
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+ * Add a short delay for the pulse to work.
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+ * According to the specifications the minimal time
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+ * should be 450ns so a 1us delay is sufficient.
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+ */
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udelay(1);
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}
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@@ -46,6 +52,12 @@ static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
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{
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eeprom->reg_data_clock = 0;
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eeprom->register_write(eeprom);
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+
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+ /*
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+ * Add a short delay for the pulse to work.
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+ * According to the specifications the minimal time
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+ * should be 450ns so a 1us delay is sufficient.
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+ */
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udelay(1);
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}
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From: John W. Linville <linville@tuxdriver.com>
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Date: Tue, 12 Jun 2007 01:37:46 +0000 (-0400)
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Subject: [PATCH] eeprom_93cx6: shorten pulse timing to match spec
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X-Git-Tag: v2.6.23-rc1~1201^2~71
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=7e9400f178d291b2208c4ed9aac0f425c1364000
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[PATCH] eeprom_93cx6: shorten pulse timing to match spec
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93cx6 datasheet available here:
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http://ww1.microchip.com/downloads/en/DeviceDoc/21749F.pdf
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Figure 1-1 and Table 1-2 on pages 4-5 indicate that both Clock High
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Time and Clock Low Time have largest minimum times of 450ns.
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Signed-off-by: John W. Linville <linville@tuxdriver.com>
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---
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diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
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index 0d6d742..ac515b0 100644
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--- a/drivers/misc/eeprom_93cx6.c
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+++ b/drivers/misc/eeprom_93cx6.c
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@@ -42,10 +42,10 @@ static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
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/*
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* Add a short delay for the pulse to work.
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- * According to the specifications the minimal time
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- * should be 450ns so a 1us delay is sufficient.
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+ * According to the specifications the "maximum minimum"
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+ * time should be 450ns.
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*/
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- udelay(1);
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+ ndelay(450);
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}
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static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
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From: Francois Romieu <romieu@fr.zoreil.com>
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Date: Tue, 3 Jul 2007 22:31:44 +0000 (+0200)
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Subject: eeprom_93cx6: shorten pulse timing to match spec (bis)
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X-Git-Tag: v2.6.23-rc1~1151^2~11
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=8abd531e3f77188de2fc41e677d075cc66e61631
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eeprom_93cx6: shorten pulse timing to match spec (bis)
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Based on an original idea by John W. Linville.
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It is the missing part of 42d45ccd60636c28e35c2016f091783bc14ad99c
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Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
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Signed-off-by: Jeff Garzik <jeff@garzik.org>
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---
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diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
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index ac515b0..ea55654 100644
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--- a/drivers/misc/eeprom_93cx6.c
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+++ b/drivers/misc/eeprom_93cx6.c
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@@ -55,10 +55,10 @@ static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
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/*
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* Add a short delay for the pulse to work.
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- * According to the specifications the minimal time
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- * should be 450ns so a 1us delay is sufficient.
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+ * According to the specifications the "maximum minimum"
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+ * time should be 450ns.
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*/
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- udelay(1);
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+ ndelay(450);
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}
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static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom)
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