Re: [PATCH 2/2] ARM: dts: add AM33XX MMC support

[Matt Porter <mporter@ti.com>]

On Thu, Mar 07, 2013 at 02:39:55PM +0000, Vaibhav Hiremath wrote:
> 
> > -----Original Message-----
> > From: Matt Porter [mailto:ohiomdp@gmail.com] On Behalf Of Porter, Matt
> > Sent: Thursday, March 07, 2013 7:43 PM
> > To: Hiremath, Vaibhav
> > Cc: Krishnamoorthy, Balaji T; Chris Ball; Cousson, Benoit; Tony
> > Lindgren; Russell King; Devicetree Discuss; Linux ARM Kernel List;
> > Linux OMAP List; Linux Kernel Mailing List; Linux MMC List
> > Subject: Re: [PATCH 2/2] ARM: dts: add AM33XX MMC support
> > 
> > On Thu, Mar 07, 2013 at 05:29:24AM +0000, Vaibhav Hiremath wrote:
> > > > -----Original Message-----
> > > > From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
> > > > owner@vger.kernel.org] On Behalf Of Porter, Matt
> > > > Sent: Thursday, March 07, 2013 9:47 AM
> > > > To: Krishnamoorthy, Balaji T; Chris Ball; Cousson, Benoit; Tony
> > > > Lindgren; Russell King
> > > > Cc: Devicetree Discuss; Linux ARM Kernel List; Linux OMAP List;
> > Linux
> > > > Kernel Mailing List; Linux MMC List
> > > > Subject: [PATCH 2/2] ARM: dts: add AM33XX MMC support
> > > >
> > > > Adds AM33XX MMC support for am335x-bone, am335x-evm, and
> > > > am335x-evmsk.
> > > >
> > > > Signed-off-by: Matt Porter <mporter@ti.com>
> > > > Acked-by: Tony Lindgren <tony@atomide.com>
> > > > ---
> > > >  arch/arm/boot/dts/am335x-bone.dts  |    7 +++++++
> > > >  arch/arm/boot/dts/am335x-evm.dts   |    7 +++++++
> > > >  arch/arm/boot/dts/am335x-evmsk.dts |    7 +++++++
> > > >  arch/arm/boot/dts/am33xx.dtsi      |   28
> > ++++++++++++++++++++++++++++
> > > >  4 files changed, 49 insertions(+)
> > > >
> > > > diff --git a/arch/arm/boot/dts/am335x-bone.dts
> > > > b/arch/arm/boot/dts/am335x-bone.dts
> > > > index 11b240c..a154ce0 100644
> > > > --- a/arch/arm/boot/dts/am335x-bone.dts
> > > > +++ b/arch/arm/boot/dts/am335x-bone.dts
> > > > @@ -120,6 +120,8 @@
> > > >  		};
> > > >
> > > >  		ldo3_reg: regulator@5 {
> > > > +			regulator-min-microvolt = <1800000>;
> > > > +			regulator-max-microvolt = <3300000>;
> > > >  			regulator-always-on;
> > > >  		};
> > > >
> > > > @@ -136,3 +138,8 @@
> > > >  &cpsw_emac1 {
> > > >  	phy_id = <&davinci_mdio>, <1>;
> > > >  };
> > > > +
> > > > +&mmc1 {
> > > > +	status = "okay";
> > > > +	vmmc-supply = <&ldo3_reg>;
> > > > +};
> > > > diff --git a/arch/arm/boot/dts/am335x-evm.dts
> > > > b/arch/arm/boot/dts/am335x-evm.dts
> > > > index d649644..2907da6 100644
> > > > --- a/arch/arm/boot/dts/am335x-evm.dts
> > > > +++ b/arch/arm/boot/dts/am335x-evm.dts
> > > > @@ -232,6 +232,8 @@
> > > >  		};
> > > >
> > > >  		vmmc_reg: regulator@12 {
> > > > +			regulator-min-microvolt = <1800000>;
> > > > +			regulator-max-microvolt = <3300000>;
> > > >  			regulator-always-on;
> > > >  		};
> > > >  	};
> > > > @@ -244,3 +246,8 @@
> > > >  &cpsw_emac1 {
> > > >  	phy_id = <&davinci_mdio>, <1>;
> > > >  };
> > > > +
> > > > +&mmc1 {
> > > > +	status = "okay";
> > > > +	vmmc-supply = <&vmmc_reg>;
> > > > +};
> > > > diff --git a/arch/arm/boot/dts/am335x-evmsk.dts
> > > > b/arch/arm/boot/dts/am335x-evmsk.dts
> > > > index f5a6162..f050c46 100644
> > > > --- a/arch/arm/boot/dts/am335x-evmsk.dts
> > > > +++ b/arch/arm/boot/dts/am335x-evmsk.dts
> > > > @@ -244,7 +244,14 @@
> > > >  		};
> > > >
> > > >  		vmmc_reg: regulator@12 {
> > > > +			regulator-min-microvolt = <1800000>;
> > > > +			regulator-max-microvolt = <3300000>;
> > > >  			regulator-always-on;
> > > >  		};
> > > >  	};
> > > >  };
> > > > +
> > > > +&mmc1 {
> > > > +	status = "okay";
> > > > +	vmmc-supply = <&vmmc_reg>;
> > > > +};
> > > > diff --git a/arch/arm/boot/dts/am33xx.dtsi
> > > > b/arch/arm/boot/dts/am33xx.dtsi
> > > > index c3c781a..e029eea 100644
> > > > --- a/arch/arm/boot/dts/am33xx.dtsi
> > > > +++ b/arch/arm/boot/dts/am33xx.dtsi
> > > > @@ -234,6 +234,34 @@
> > > >  			status = "disabled";
> > > >  		};
> > > >
> > > > +		mmc1: mmc@48060000 {
> > > > +			compatible = "ti,omap3-hsmmc";
> > > > +			ti,hwmods = "mmc1";
> > > > +			ti,dual-volt;
> > > > +			ti,needs-special-reset;
> > > > +			dmas = <&edma 24
> > > > +				&edma 25>;
> > > > +			dma-names = "tx", "rx";
> > > > +			status = "disabled";
> > > > +		};
> > > > +
> > > > +		mmc2: mmc@481d8000 {
> > > > +			compatible = "ti,omap3-hsmmc";
> > > > +			ti,hwmods = "mmc2";
> > > > +			ti,needs-special-reset;
> > > > +			dmas = <&edma 2
> > > > +				&edma 3>;
> > > > +			dma-names = "tx", "rx";
> > > > +			status = "disabled";
> > > > +		};
> > > > +
> > > > +		mmc3: mmc@47810000 {
> > > > +			compatible = "ti,omap3-hsmmc";
> > > > +			ti,hwmods = "mmc3";
> > > > +			ti,needs-special-reset;
> > > > +			status = "disabled";
> > > > +		};
> > > Any specific reason why you did not add edma entry here as well?
> > 
> > Yes, I've answered this one before and I think this illustrates a need
> > for a comment in the .dtsi. mmc3 edma event are on the crossbar and so
> > the event that will be mapped is system-specific. Since Luca is still
> > working on DT support for WiLink, there's no way to show an example of
> > how this is used upstream as that's the only in-kernel user.
> > 
> > I have a test driver I've cited in the postings that shows how the
> > crossbar is configured via the board .dts. It doesn't belong in the
> > .dtsi, however, in this case. When WiLink DT support is ready we can
> > have an entry in the am335x-evmsk.dts that shows this case.
> > 
> > > Also, I wonder why "interrupt" property is not coming here, I
> > understand
> > > That hwmod is filling the gap here; but I would still recommend you
> > to complete
> > > The DT node, as we only support DT boot.
> > 
> > Yeah, I only added needed properties so as to not confuse people as to
> > where the interrupt resources are coming from. If you feel strongly
> > about this I don't have a problem with adding unused data in the dts.
> > I suppose this will help clear things to have a switch away from using
> > the hwmod data.
> 
> Its not true, if you specify interrupt property in the DTS file
> It is being used. Please refer to the omap_device.c file. I am pasting
> Comments from code for your reference -
> 
> 
> 389         /*
> 390          * Non-DT Boot:
> 391          *   Here, pdev->num_resources = 0, and we should get all the
> 392          *   resources from hwmod.
> 393          *
> 394          * DT Boot:
> 395          *   OF framework will construct the resource structure (currently
> 396          *   does for MEM & IRQ resource) and we should respect/use these
> 397          *   resources, killing hwmod dependency.
> 398          *   If pdev->num_resources > 0, we assume that MEM & IRQ resources
> 399          *   have been allocated by OF layer already (through DTB).
> 400          *   As preparation for the future we examine the OF provided resources
> 401          *   to see if we have DMA resources provided already. In this case
> 402          *   there is no need to update the resources for the device, we use the
> 403          *   OF provided ones.
> 404          *
> 405          * TODO: Once DMA resource is available from OF layer, we should
> 406          *   kill filling any resources from hwmod.
> 407          */

Ok thanks, we'll add it in.
 
> > 
> > > I will test the whole patch series today and update you.
> > 
> I just booted up the EVM with all the patches you have submitted recently,
> There are two issues I can see,
> 
> 1. Stack dump from MMC driver.
> This happens because you do not have "interrupt" property mentioned
> In the dts file. I have added "interrupt" property and dump went away.
> 
> 2. And MMC rootFS mount is __not__ working for me.
> 
> 3. I get following error message - 
> 
> [    2.118207] omap_hsmmc mmc.3: unable to obtain RX DMA engine channel 25

See below, you don't have CONFIG_EDMA on most likely.

> I haven’t debugged it yet, just thought I should report it before 
> Proceeding further.
> 
> 
> Boot Log:
> ======================================
> 
> U-Boot# mmc rescan 0
> U-Boot# fatload mmc 0 82000000 uImage
> reading uImage
> 4026992 bytes read in 441 ms (8.7 MiB/s)
> U-Boot# fatload mmc 0 81000000 am335x-evm.dtb
> reading am335x-evm.dtb
> 11371 bytes read in 10 ms (1.1 MiB/s)
> U-Boot# run mmcargs
> U-Boot# bootm 82000000 - 81000000
> ## Booting kernel from Legacy Image at 82000000 ...
>    Image Name:   Linux
>    Image Type:   ARM Linux Kernel Image (uncompressed)
>    Data Size:    4026928 Bytes = 3.8 MiB
>    Load Address: 80008000
>    Entry Point:  80008000
>    Verifying Checksum ... OK
> ## Flattened Device Tree blob at 81000000
>    Booting using the fdt blob at 0x81000000
>    Loading Kernel Image ... OK
> OK
>    Using Device Tree in place at 81000000, end 81005c6a
> 
> Starting kernel ...
> 
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Linux version 3.9.0-rc1-00122-g106e3c6 (XXX@psplinux064) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #2 SMP Thu Mar 7 16:57:39 IST 2013
> [    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
> [    0.000000] Machine: Generic AM33XX (Flattened Device Tree), model: TI AM335x EVM
> [    0.000000] cma: CMA: reserved 16 MiB at ae800000
> [    0.000000] Memory policy: ECC disabled, Data cache writeback
> [    0.000000] CPU: All CPU(s) started in SVC mode.
> [    0.000000] AM335X ES2.0 (neon )
> [    0.000000] PERCPU: Embedded 9 pages/cpu @c181d000 s13632 r8192 d15040 u36864
> [    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 260368
> [    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 ro rootfstype=ext3 rootwait ip=none
> [    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
> [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> [    0.000000] __ex_table already sorted, skipping sort
> [    0.000000] Memory: 1023MB = 1023MB total
> [    0.000000] Memory: 1008260k/1008260k available, 40316k reserved, 269312K highmem
> [    0.000000] Virtual kernel memory layout:
> [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
> [    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
> [    0.000000]     vmalloc : 0xf0000000 - 0xff000000   ( 240 MB)
> [    0.000000]     lowmem  : 0xc0000000 - 0xef800000   ( 760 MB)
> [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
> [    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
> [    0.000000]       .text : 0xc0008000 - 0xc071fa34   (7263 kB)
> [    0.000000]       .init : 0xc0720000 - 0xc0775540   ( 342 kB)
> [    0.000000]       .data : 0xc0776000 - 0xc080f0e0   ( 613 kB)
> [    0.000000]        .bss : 0xc080f0e0 - 0xc0d6a348   (5485 kB)
> [    0.000000] Hierarchical RCU implementation.
> [    0.000000]  RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
> [    0.000000] NR_IRQS:16 nr_irqs:16 16
> [    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
> [    0.000000] Total of 128 interrupts on 1 active controller
> [    0.000000] OMAP clockevent source: GPTIMER1 at 24000000 Hz
> [    0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
> [    0.000000] OMAP clocksource: GPTIMER2 at 24000000 Hz
> [    0.000000] Console: colour dummy device 80x30
> [    0.000000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> [    0.000000] ... MAX_LOCKDEP_SUBCLASSES:  8
> [    0.000000] ... MAX_LOCK_DEPTH:          48
> [    0.000000] ... MAX_LOCKDEP_KEYS:        8191
> [    0.000000] ... CLASSHASH_SIZE:          4096
> [    0.000000] ... MAX_LOCKDEP_ENTRIES:     16384
> [    0.000000] ... MAX_LOCKDEP_CHAINS:      32768
> [    0.000000] ... CHAINHASH_SIZE:          16384
> [    0.000000]  memory used by lock dependency info: 3695 kB
> [    0.000000]  per task-struct memory footprint: 1152 bytes
> [    0.000989] Calibrating delay loop... 530.84 BogoMIPS (lpj=2654208)
> [    0.109762] pid_max: default: 32768 minimum: 301
> [    0.110250] Security Framework initialized
> [    0.110399] Mount-cache hash table entries: 512
> [    0.121898] CPU: Testing write buffer coherency: ok
> [    0.123398] CPU0: thread -1, cpu 0, socket -1, mpidr 0
> [    0.123476] Setting up static identity map for 0xc0510518 - 0xc0510588
> [    0.126105] Brought up 1 CPUs
> [    0.126130] SMP: Total of 1 processors activated (530.84 BogoMIPS).
> [    0.126142] CPU: All CPU(s) started in SVC mode.
> [    0.129134] devtmpfs: initialized
> [    0.199323] pinctrl core: initialized pinctrl subsystem
> [    0.205505] regulator-dummy: no parameters
> [    0.209247] NET: Registered protocol family 16
> [    0.217051] DMA: preallocated 256 KiB pool for atomic coherent allocations
> [    0.236271] platform 49000000.edma: alias fck already exists
> [    0.236311] platform 49000000.edma: alias fck already exists
> [    0.236333] platform 49000000.edma: alias fck already exists

This is from the private edma api.

> [    0.241486] OMAP GPIO hardware version 0.1
> [    0.265045] No ATAGs?
> [    0.265073] hw-breakpoint: debug architecture 0x4 unsupported.
> [    0.271061] Serial: AMBA PL011 UART driver
> [    0.329077] bio: create slab <bio-0> at 0
> [    0.406141] omap-dma-engine omap-dma-engine: OMAP DMA engine driver

Only OMAP dmaengine driver appears to be built in.

> [    0.408010] vbat: 5000 mV
> [    0.409244] lis3_reg: no parameters
> [    0.417237] SCSI subsystem initialized
> [    0.419384] usbcore: registered new interface driver usbfs
> [    0.420409] usbcore: registered new interface driver hub
> [    0.421312] usbcore: registered new device driver usb
> [    0.423218] omap_i2c 44e0b000.i2c: did not get pins for i2c error: -19
> [    0.425064] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
> [    0.427105] tps65910 0-002d: No interrupt support, no core IRQ
> [    0.433470] vrtc: 1800 mV
> [    0.433880] vrtc: supplied by vbat
> [    0.437014] vio: at 1500 mV
> [    0.437157] vio: supplied by vbat
> [    0.440177] vdd_mpu: 912 <--> 1312 mV at 1262 mV
> [    0.440331] vdd_mpu: supplied by vbat
> [    0.443151] vdd_core: 912 <--> 1150 mV at 1137 mV
> [    0.443293] vdd_core: supplied by vbat
> [    0.445806] vdd3: 5000 mV
> [    0.448346] vdig1: at 1800 mV
> [    0.448486] vdig1: supplied by vbat
> [    0.451824] vdig2: at 1800 mV
> [    0.451967] vdig2: supplied by vbat
> [    0.454524] vpll: at 1800 mV
> [    0.454652] vpll: supplied by vbat
> [    0.457185] vdac: at 1800 mV
> [    0.457311] vdac: supplied by vbat
> [    0.459975] vaux1: at 1800 mV
> [    0.460112] vaux1: supplied by vbat
> [    0.462698] vaux2: at 3300 mV
> [    0.462830] vaux2: supplied by vbat
> [    0.465339] vaux33: at 3300 mV
> [    0.465466] vaux33: supplied by vbat
> [    0.467947] vmmc:  omap_i2c 4802a000.i2c: did not get pins for i2c error: -19
> [    0.471641] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz
> [    0.482881] Switching to clocksource gp_timer
> [    0.607600] NET: Registered protocol family 2
> [    0.609603] TCP established hash table entries: 8192 (order: 4, 65536 bytes)
> [    0.609956] TCP bind hash table entries: 8192 (order: 6, 294912 bytes)
> [    0.613521] TCP: Hash tables configured (established 8192 bind 8192)
> [    0.613821] TCP: reno registered
> [    0.613863] UDP hash table entries: 512 (order: 3, 40960 bytes)
> [    0.614323] UDP-Lite hash table entries: 512 (order: 3, 40960 bytes)
> [    0.615553] NET: Registered protocol family 1
> [    0.617700] RPC: Registered named UNIX socket transport module.
> [    0.617727] RPC: Registered udp transport module.
> [    0.617739] RPC: Registered tcp transport module.
> [    0.617752] RPC: Registered tcp NFSv4.1 backchannel transport module.
> [    0.618827] NetWinder Floating Point Emulator V0.97 (double precision)
> [    0.619316] CPU PMU: probing PMU on CPU 0
> [    0.619350] hw perfevents: enabled with ARMv7 Cortex-A8 PMU driver, 5 counters available
> [    0.776940] bounce pool size: 64 pages
> [    0.777782] VFS: Disk quotas dquot_6.5.2
> [    0.777995] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> [    0.780682] NFS: Registering the id_resolver key type
> [    0.781239] Key type id_resolver registered
> [    0.781263] Key type id_legacy registered
> [    0.781406] jffs2: version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
> [    0.781933] msgmni has been set to 1475
> [    0.785529] io scheduler noop registered
> [    0.785553] io scheduler deadline registered
> [    0.785652] io scheduler cfq registered (default)
> [    0.787072] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
> [    0.791600] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [    0.798575] omap_uart 44e09000.serial: did not get pins for uart0 error: -19
> [    0.799200] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88) is a OMAP UART0
> [    1.549008] console [ttyO0] enabled
> [    1.586206] brd: module loaded
> [    1.608954] loop: module loaded
> [    1.617979] mtdoops: mtd device (mtddev=name/number) must be supplied
> [    1.626230] OneNAND driver initializing
> [    1.636711] usbcore: registered new interface driver asix
> [    1.642874] usbcore: registered new interface driver ax88179_178a
> [    1.650170] usbcore: registered new interface driver cdc_ether
> [    1.657216] usbcore: registered new interface driver smsc95xx
> [    1.663954] usbcore: registered new interface driver net1080
> [    1.670358] usbcore: registered new interface driver cdc_subset
> [    1.677253] usbcore: registered new interface driver zaurus
> [    1.683851] usbcore: registered new interface driver cdc_ncm
> [    1.691998] usbcore: registered new interface driver cdc_wdm
> [    1.698149] Initializing USB Mass Storage driver...
> [    1.703927] usbcore: registered new interface driver usb-storage
> [    1.710287] USB Mass Storage support registered.
> [    1.715804] usbcore: registered new interface driver usbtest
> [    1.724258] mousedev: PS/2 mouse device common for all mice
> [    1.735860] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0
> [    1.745083] i2c /dev entries driver
> [    1.751902] Driver for 1-wire Dallas network protocol.
> [    1.762053] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
> [    1.773746] omap-dma-engine omap-dma-engine: allocating channel for 25

Because the EDMA DMA engine driver isn't active, the driver tries to use
the OMAP DMA engine driver.

> [    1.780741] BUG: spinlock bad magic on CPU#0, swapper/0/1
> [    1.786477]  lock: dma_chan_lock+0x0/0x20, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
> [    1.795523] [<c001acb8>] (unwind_backtrace+0x0/0xf0) from [<c02d4838>] (do_raw_spin_lock+0x15c/0x19c)
> [    1.805284] [<c02d4838>] (do_raw_spin_lock+0x15c/0x19c) from [<c050a93c>] (_raw_spin_lock_irqsave+0x4c/0x58)
> [    1.815692] [<c050a93c>] (_raw_spin_lock_irqsave+0x4c/0x58) from [<c0040450>] (omap_request_dma+0x24/0x1b8)
> [    1.826014] [<c0040450>] (omap_request_dma+0x24/0x1b8) from [<c02ffca8>] (omap_dma_alloc_chan_resources+0x3c/0x50)
> [    1.836970] [<c02ffca8>] (omap_dma_alloc_chan_resources+0x3c/0x50) from [<c02fdfc8>] (dma_chan_get+0x5c/0xfc)
> [    1.847457] [<c02fdfc8>] (dma_chan_get+0x5c/0xfc) from [<c02fe6fc>] (__dma_request_channel+0xfc/0x1c0)
> [    1.857322] [<c02fe6fc>] (__dma_request_channel+0xfc/0x1c0) from [<c0422398>] (omap_hsmmc_probe+0x38c/0x908)
> [    1.867732] [<c0422398>] (omap_hsmmc_probe+0x38c/0x908) from [<c0339dc4>] (platform_drv_probe+0x18/0x1c)
> [    1.877767] [<c0339dc4>] (platform_drv_probe+0x18/0x1c) from [<c0338a68>] (really_probe+0x74/0x200)
> [    1.887342] [<c0338a68>] (really_probe+0x74/0x200) from [<c0338d0c>] (driver_probe_device+0x30/0x48)
> [    1.897010] [<c0338d0c>] (driver_probe_device+0x30/0x48) from [<c0338db8>] (__driver_attach+0x94/0x98)
> [    1.906860] [<c0338db8>] (__driver_attach+0x94/0x98) from [<c0337424>] (bus_for_each_dev+0x64/0x88)
> [    1.916433] [<c0337424>] (bus_for_each_dev+0x64/0x88) from [<c03383a8>] (bus_add_driver+0x1c0/0x240)
> [    1.926098] [<c03383a8>] (bus_add_driver+0x1c0/0x240) from [<c03392ec>] (driver_register+0x78/0x144)
> [    1.935758] [<c03392ec>] (driver_register+0x78/0x144) from [<c00086a4>] (do_one_initcall+0x34/0x180)
> [    1.945432] [<c00086a4>] (do_one_initcall+0x34/0x180) from [<c07208f8>] (kernel_init_freeable+0xfc/0x1c8)
> [    1.955553] [<c07208f8>] (kernel_init_freeable+0xfc/0x1c8) from [<c0502664>] (kernel_init+0x8/0xe4)
> [    1.965139] [<c0502664>] (kernel_init+0x8/0xe4) from [<c00133f0>] (ret_from_fork+0x14/0x24)
> [    1.974061] omap_hsmmc mmc.3: unable to obtain RX DMA engine channel 25
> [    1.982218] ledtrig-cpu: registered to indicate activity on CPUs
> [    1.989997] usbcore: registered new interface driver usbhid
> [    1.995997] usbhid: USB HID core driver
> [    2.001076] oprofile: using arm/armv7
> [    2.005481] TCP: cubic registered
> [    2.008992] Initializing XFRM netlink socket
> [    2.013601] NET: Registered protocol family 17
> [    2.018370] NET: Registered protocol family 15
> [    2.023292] Key type dns_resolver registered
> [    2.027918] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
> [    2.036074] ThumbEE CPU extension supported.
> [    2.103314] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
> [    2.109789] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
> [    2.117400] libphy: 4a101000.mdio: probed
> [    2.121661] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver unknown
> [    2.130442] Random MACID = aa:e0:1c:4f:40:25
> [    2.137280] of_get_named_gpio_flags exited with status 2
> [    2.143115] of_get_named_gpio_flags exited with status 3
> [    2.149951] input: volume_keys.7 as /devices/volume_keys.7/input/input0
> [    2.158349] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:00:01 UTC (946684801)
> [    2.168602] Waiting for root device /dev/mmcblk0p2...
> 
> 
> Thanks.
> Vaibhav
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