| Message ID | 1406043594-14181-1-git-send-email-nm@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
> 1: dra72x-evm: Boot ok: http://slexy.org/raw/s20I6QXQa (needs MMC filesystem that current dts does not have.
Oops - missed a character in the link:
http://slexy.org/view/s20I6QXQal
Sorry about the spam.
On Tue, Jul 22, 2014 at 10:39:54AM -0500, Nishanth Menon wrote: > The DRA74/72 control module pins have a weak pull up and pull down. > This is configured by bit offset 17. if BIT(17) is 1, a pull up is > selected, else a pull down is selected. > > However, this pull resisstor is applied based on BIT(16) - > PULLUDENABLE - if BIT(18) is *0*, then pull as defined in BIT(17) is > applied, else no weak pulls are applied. We defined this in reverse. > > Reference: Table 18-5 (Description of the pad configuration register > bits) in Technical Reference Manual Revision (DRA74x revision Q: > SPRUHI2Q Revised June 2014 and DRA72x revision F: SPRUHP2F - Revised > June 2014) > > Fixes: 6e58b8f1daaf1a ("ARM: dts: DRA7: Add the dts files for dra7 SoC and dra7-evm board") > Signed-off-by: Nishanth Menon <nm@ti.com> > --- Tested on an upcoming board. Tested-by: Felipe Balbi <balbi@ti.com> Acked-by: Felipe Balbi <balbi@ti.com>
On 07/22/2014 11:47 AM, Felipe Balbi wrote: > On Tue, Jul 22, 2014 at 10:39:54AM -0500, Nishanth Menon wrote: >> The DRA74/72 control module pins have a weak pull up and pull down. >> This is configured by bit offset 17. if BIT(17) is 1, a pull up is >> selected, else a pull down is selected. >> >> However, this pull resisstor is applied based on BIT(16) - >> PULLUDENABLE - if BIT(18) is *0*, then pull as defined in BIT(17) is >> applied, else no weak pulls are applied. We defined this in reverse. >> >> Reference: Table 18-5 (Description of the pad configuration register >> bits) in Technical Reference Manual Revision (DRA74x revision Q: >> SPRUHI2Q Revised June 2014 and DRA72x revision F: SPRUHP2F - Revised >> June 2014) >> >> Fixes: 6e58b8f1daaf1a ("ARM: dts: DRA7: Add the dts files for dra7 SoC and dra7-evm board") >> Signed-off-by: Nishanth Menon <nm@ti.com> >> --- > > Tested on an upcoming board. > > Tested-by: Felipe Balbi <balbi@ti.com> > Acked-by: Felipe Balbi <balbi@ti.com> > > Felipe, Thanks. Tony, If you could consider this for the rc cycle it might be great(as well as for stable). The pull direction error can cause all kinds of Pull-down Vs Pull-Up contention with severe risk for certain IP reliability.
* Nishanth Menon <nm@ti.com> [140722 11:34]: > On 07/22/2014 11:47 AM, Felipe Balbi wrote: > > On Tue, Jul 22, 2014 at 10:39:54AM -0500, Nishanth Menon wrote: > >> The DRA74/72 control module pins have a weak pull up and pull down. > >> This is configured by bit offset 17. if BIT(17) is 1, a pull up is > >> selected, else a pull down is selected. > >> > >> However, this pull resisstor is applied based on BIT(16) - > >> PULLUDENABLE - if BIT(18) is *0*, then pull as defined in BIT(17) is > >> applied, else no weak pulls are applied. We defined this in reverse. > >> > >> Reference: Table 18-5 (Description of the pad configuration register > >> bits) in Technical Reference Manual Revision (DRA74x revision Q: > >> SPRUHI2Q Revised June 2014 and DRA72x revision F: SPRUHP2F - Revised > >> June 2014) > >> > >> Fixes: 6e58b8f1daaf1a ("ARM: dts: DRA7: Add the dts files for dra7 SoC and dra7-evm board") > >> Signed-off-by: Nishanth Menon <nm@ti.com> > >> --- > > > > Tested on an upcoming board. > > > > Tested-by: Felipe Balbi <balbi@ti.com> > > Acked-by: Felipe Balbi <balbi@ti.com> > > > > > Felipe, > Thanks. > > Tony, > > If you could consider this for the rc cycle it might be great(as well > as for stable). The pull direction error can cause all kinds of > Pull-down Vs Pull-Up contention with severe risk for certain IP > reliability. Yes this is a good one for the -rc cycle, applying into omap-for-v3.16/fixes. Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/include/dt-bindings/pinctrl/dra.h b/include/dt-bindings/pinctrl/dra.h index 002a285..3d33794 100644 --- a/include/dt-bindings/pinctrl/dra.h +++ b/include/dt-bindings/pinctrl/dra.h @@ -30,7 +30,8 @@ #define MUX_MODE14 0xe #define MUX_MODE15 0xf -#define PULL_ENA (1 << 16) +#define PULL_ENA (0 << 16) +#define PULL_DIS (1 << 16) #define PULL_UP (1 << 17) #define INPUT_EN (1 << 18) #define SLEWCONTROL (1 << 19) @@ -38,10 +39,10 @@ #define WAKEUP_EVENT (1 << 25) /* Active pin states */ -#define PIN_OUTPUT 0 +#define PIN_OUTPUT (0 | PULL_DIS) #define PIN_OUTPUT_PULLUP (PIN_OUTPUT | PULL_ENA | PULL_UP) #define PIN_OUTPUT_PULLDOWN (PIN_OUTPUT | PULL_ENA) -#define PIN_INPUT INPUT_EN +#define PIN_INPUT (INPUT_EN | PULL_DIS) #define PIN_INPUT_SLEW (INPUT_EN | SLEWCONTROL) #define PIN_INPUT_PULLUP (PULL_ENA | INPUT_EN | PULL_UP) #define PIN_INPUT_PULLDOWN (PULL_ENA | INPUT_EN)
The DRA74/72 control module pins have a weak pull up and pull down. This is configured by bit offset 17. if BIT(17) is 1, a pull up is selected, else a pull down is selected. However, this pull resisstor is applied based on BIT(16) - PULLUDENABLE - if BIT(18) is *0*, then pull as defined in BIT(17) is applied, else no weak pulls are applied. We defined this in reverse. Reference: Table 18-5 (Description of the pad configuration register bits) in Technical Reference Manual Revision (DRA74x revision Q: SPRUHI2Q Revised June 2014 and DRA72x revision F: SPRUHP2F - Revised June 2014) Fixes: 6e58b8f1daaf1a ("ARM: dts: DRA7: Add the dts files for dra7 SoC and dra7-evm board") Signed-off-by: Nishanth Menon <nm@ti.com> --- Patch based on v3.16-rc5 tag 1: dra72x-evm: Boot ok: http://slexy.org/raw/s20I6QXQa (needs MMC filesystem that current dts does not have. - Fails in plain Vanilla 3.16-rc5 kernel due to missing patch to handle USB IP instance delta (between dra72x and dra74x) appropriately. - Tested with fixes needed: https://patchwork.kernel.org/patch/4565431/ and https://patchwork.kernel.org/patch/4565461/ 2: dra7xx-evm: Boot PASS: http://slexy.org/raw/s21c6X2wOd Equivalent testing on 3.14 based product kernel: dra72x-evm: Boot PASS: http://slexy.org/raw/s21yIgttJw dra7xx-evm: Boot PASS: http://slexy.org/raw/s20w7OZaJJ It is obvious that current users of padconf have'nt had trouble with the wrong definitions. I think I might have been the first to discover this as emmc on beagleboard-X15 (an upcoming platform) exposed this problem. include/dt-bindings/pinctrl/dra.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)