[U-Boot] [PATCH v3] mx6: Read silicon revision from register

Liu Hui-R64343 r64343 at freescale.com
Wed Mar 14 07:09:27 CET 2012

>-----Original Message-----
>From: Fabio Estevam [mailto:festevam at gmail.com]
>Sent: Wednesday, March 14, 2012 10:57 AM
>To: u-boot at lists.denx.de
>Cc: sbabic at denx.de; eric.nelson at boundarydevices.com;
>dirk.behme at de.bosch.com; Liu Hui-R64343; Estevam Fabio-R49496
>Subject: [PATCH v3] mx6: Read silicon revision from register
>Instead of hardcoding the mx6 silicon revision, read it in run-time.
>Also, besides the silicon version also print the mx6 variant type: quad,
>dual/solo or solo-lite.
>Tested on a mx6qsabrelite, where it shows:
>CPU:   Freescale i.MX6Q rev1.0 at 792 MHz
>Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
>Changes since v2:
>- Read both chip variant and chip silicon version from anatop
>- Create a struct for accessing the anatop registers Changes since v1:
>- Fix typo on Subject
> arch/arm/cpu/armv7/imx-common/cpu.c      |   19 +++++++++++++++++--
> arch/arm/cpu/armv7/mx6/soc.c             |    8 +++++++-
> arch/arm/include/asm/arch-mx6/imx-regs.h |    5 +++++
> 3 files changed, 29 insertions(+), 3 deletions(-)


>diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h
>index 5ba5f39..9644807 100644
>--- a/arch/arm/include/asm/arch-mx6/imx-regs.h
>+++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
>@@ -294,5 +294,10 @@ struct aipstz_regs {
> 	u32	opacr4;
> };
>+struct anatop_regs {
>+	u8	rsvd[0x260]; /* To be completed as needed */
>+	u32	siliconid;

I'm afraid whether this is correct to add it here since some registers of anatop was included into the ccm_reg.

ANATOP is a collection of analog and anadig. So, ANATOP register mostly is consist of 4 parts:

ANADIG in CCM: for example: PLL/PFD,
ANAREG in power: internal analog regulator, power tree.
ANAUSB in usb: for usb vbus dection, charge, etc.
ANAMISC: misc feature, only one register now for the Chip Silicon Version

So the siliconid is in the last register.

Jason Liu

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