On 24/04/2017 at 09:12:17 +0800, Wenyou Yang wrote: > Add nodes to support the Controller Area Network(M_CAN) on SAMA5D2. > The version of M_CAN IP core is 3.1.0 (CREL = 0x31040730). > > As said in SAMA5D2 datasheet, the CAN clock is recommended to use > frequencies of 20, 40 or 80 MHz. To achieve these frequencies, > PMC GCLK3 must select the UPLLCK(480 MHz) as source clock and > divide by 24, 12, or 6. So, the "assigned-clock-rates" property > has three options: 20000000, 40000000, and 80000000. > The "assigned-clock-parents" property should be referred to utmi > fixedly. > > The MSBs [bits 31:16] of the CAN Message RAM for CAN0 and CAN1 are > default configured in 0x00200000. To avoid conflict with SRAM map > for PM, change them to 0x00210000 in the AT91Bootstrap via setting > the CAN Memories Address-based Register(SFR_CAN) of SFR. > > Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx> > Tested-by: Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx> > --- > The patch is tested on SAMA5D2 Xplained and based on the patch set, > 1. [PATCH v4 1/7] can: m_can: Disabled Interrupt Line 1 > http://marc.info/?l=linux-can&m=149165343604033&w=2 > > Changes in v3: > - Add Tested-by tag. > - Change the number of Rx Rx Buffers, Tx Buffers and Tx Event FIFO > to maximum. > > Changes in v2: > - Configures 10 TX Event FIFO elements and 10 TX Buffers/FIFO slots, > because the TXE FIFO is needed to be configured. > - Configure the offset of Message RAM for CAN1 followed from CAN0's. > > arch/arm/boot/dts/at91-sama5d2_xplained.dts | 24 +++++++++++++ > arch/arm/boot/dts/sama5d2.dtsi | 56 +++++++++++++++++++++++++++++ > 2 files changed, 80 insertions(+) > It didn't apply cleanly, can you please verify https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git/log/?h=at91-dt -- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
