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omap: TWL4030 Bump VMMC1 interface voltage from 3V to 3.15V

PATCH New Ash Charles 3 participants 3 messages Sep 28, 2011 – Dec 6, 2011

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Ash Charles

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PATCH 1/1 omap: TWL4030 Bump VMMC1 interface voltage from 3V to 3.15V

MMC interfaces are specified to be 3.3V compatible with an operating voltage range of 3.1V to 3.5V for SD cards. This change affects hardware using TWL4030 (TPS6595x) PMICs and should improve the reliability when communicating with marginally-spec'd MMC devices. 3.15V is the highest possible level for this chip. This patch has been tested on a Gumstix Overo board.

Signed-off-by Ash Charles <[email protected]>
---
 drivers/power/twl4030.c |    4 ++--
 include/twl4030.h       |    1 +
 2 files changed, 3 insertions(+), 2 deletions(-)
drivers/power/twl4030.c +2 -2
index 5a7323a..4a4ddeb 100644
@@ -97,9 +97,9 @@ void twl4030_power_init(void)
 
 void twl4030_power_mmc_init(void)
 {
-	/* Set VMMC1 to 3 Volts */
+	/* Set VMMC1 to 3.15 Volts */
 	twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC1_DEDICATED,
-				TWL4030_PM_RECEIVER_VMMC1_VSEL_30,
+				TWL4030_PM_RECEIVER_VMMC1_VSEL_32,
 				TWL4030_PM_RECEIVER_VMMC1_DEV_GRP,
 				TWL4030_PM_RECEIVER_DEV_GRP_P1);
 }
include/twl4030.h +1 -0
index 930c285..9cd32ab 100644
@@ -310,6 +310,7 @@
 #define TWL4030_PM_RECEIVER_VPLL2_VSEL_18		0x05
 #define TWL4030_PM_RECEIVER_VDAC_VSEL_18		0x03
 #define TWL4030_PM_RECEIVER_VMMC1_VSEL_30		0x02
+#define TWL4030_PM_RECEIVER_VMMC1_VSEL_32		0x03
 
 /* Device Selection in PM Receiver Module */
 #define TWL4030_PM_RECEIVER_DEV_GRP_P1			0x20
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1.7.4.1
#1 lore raw

PATCH 1/1 omap: TWL4030 Bump VMMC1 interface voltage from 3V to 3.15V

Quoted 8 lines · Ash Charles

MMC interfaces are specified to be 3.3V compatible with an operating voltage range of 3.1V to 3.5V for SD cards. This change affects hardware using TWL4030 (TPS6595x) PMICs and should improve the reliability when communicating with marginally-spec'd MMC devices. 3.15V is the highest possible level for this chip. ?This patch has been tested on a Gumstix Overo board.

Signed-off-by Ash Charles <[email protected]>
Tested-by Steve Sakoman <[email protected]>

Steve

#2 lore raw

PATCH 1/1 omap: TWL4030 Bump VMMC1 interface voltage from 3V to 3.15V

In reply to Ash Charles
Quoted 7 lines · On Wed, 28 Sep 2011 09:47:16 -0700 Ash Charles <[email protected]> wrote:

MMC interfaces are specified to be 3.3V compatible with an operating voltage range of 3.1V to 3.5V for SD cards. This change affects hardware using TWL4030 (TPS6595x) PMICs and should improve the reliability when communicating with marginally-spec'd MMC devices. 3.15V is the highest possible level for this chip. This patch has been tested on a Gumstix Overo board.

Quoted 5 lines
Signed-off-by Ash Charles <[email protected]>
---
 drivers/power/twl4030.c |    4 ++--
 include/twl4030.h       |    1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

Applied to u-boot-staging/agust at denx.de. Thanks!

Anatolij