On 09/05/2017 at 16:27:36 +0800, Yang, Wenyou wrote: > > > On 2017/4/24 9:12, 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> > > Do you have any comments? No but this was too late for the previous release and v4.12-rc1 is not tagged yet so I can't base the dt branch on it. > > --- > > 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(+) > > > > diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts > > index 9f7f8a7d8ff9..2f19b08dc226 100644 > > --- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts > > +++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts > > @@ -257,6 +257,12 @@ > > status = "okay"; > > }; > > + can0: can@f8054000 { > > + pinctrl-names = "default"; > > + pinctrl-0 = <&pinctrl_can0_default>; > > + status = "okay"; > > + }; > > + > > uart3: serial@fc008000 { > > atmel,use-dma-rx; > > atmel,use-dma-tx; > > @@ -321,6 +327,18 @@ > > bias-disable; > > }; > > + pinctrl_can0_default: can0_default { > > + pinmux = <PIN_PC10__CANTX0>, > > + <PIN_PC11__CANRX0>; > > + bias-disable; > > + }; > > + > > + pinctrl_can1_default: can1_default { > > + pinmux = <PIN_PC26__CANTX1>, > > + <PIN_PC27__CANRX1>; > > + bias-disable; > > + }; > > + > > pinctrl_charger_chglev: charger_chglev { > > pinmux = <PIN_PA12__GPIO>; > > bias-disable; > > @@ -468,6 +486,12 @@ > > }; > > }; > > + > > + can1: can@fc050000 { > > + pinctrl-names = "default"; > > + pinctrl-0 = <&pinctrl_can1_default>; > > + status = "okay"; > > + }; > > }; > > }; > > diff --git a/arch/arm/boot/dts/sama5d2.dtsi b/arch/arm/boot/dts/sama5d2.dtsi > > index 22332be72140..7e00fa21373e 100644 > > --- a/arch/arm/boot/dts/sama5d2.dtsi > > +++ b/arch/arm/boot/dts/sama5d2.dtsi > > @@ -762,6 +762,18 @@ > > atmel,clk-output-range = <0 83000000>; > > }; > > + can0_clk: can0_clk { > > + #clock-cells = <0>; > > + reg = <56>; > > + atmel,clk-output-range = <0 83000000>; > > + }; > > + > > + can1_clk: can1_clk { > > + #clock-cells = <0>; > > + reg = <57>; > > + atmel,clk-output-range = <0 83000000>; > > + }; > > + > > classd_clk: classd_clk { > > #clock-cells = <0>; > > reg = <59>; > > @@ -890,6 +902,18 @@ > > #clock-cells = <0>; > > reg = <55>; > > }; > > + > > + can0_gclk: can0_gclk { > > + #clock-cells = <0>; > > + reg = <56>; > > + atmel,clk-output-range = <0 80000000>; > > + }; > > + > > + can1_gclk: can1_gclk { > > + #clock-cells = <0>; > > + reg = <57>; > > + atmel,clk-output-range = <0 80000000>; > > + }; > > }; > > }; > > @@ -1144,6 +1168,22 @@ > > clocks = <&clk32k>; > > }; > > + can0: can@f8054000 { > > + compatible = "bosch,m_can"; > > + reg = <0xf8054000 0x4000>, <0x210000 0x4000>; > > + reg-names = "m_can", "message_ram"; > > + interrupts = <56 IRQ_TYPE_LEVEL_HIGH 7>, > > + <64 IRQ_TYPE_LEVEL_HIGH 7>; > > + interrupt-names = "int0", "int1"; > > + clocks = <&can0_clk>, <&can0_gclk>; > > + clock-names = "hclk", "cclk"; > > + assigned-clocks = <&can0_gclk>; > > + assigned-clock-parents = <&utmi>; > > + assigned-clock-rates = <40000000>; > > + bosch,mram-cfg = <0x0 0 0 64 0 0 32 32>; > > + status = "disabled"; > > + }; > > + > > spi1: spi@fc000000 { > > compatible = "atmel,at91rm9200-spi"; > > reg = <0xfc000000 0x100>; > > @@ -1305,6 +1345,22 @@ > > status = "okay"; > > }; > > + can1: can@fc050000 { > > + compatible = "bosch,m_can"; > > + reg = <0xfc050000 0x4000>, <0x210000 0x4000>; > > + reg-names = "m_can", "message_ram"; > > + interrupts = <57 IRQ_TYPE_LEVEL_HIGH 7>, > > + <65 IRQ_TYPE_LEVEL_HIGH 7>; > > + interrupt-names = "int0", "int1"; > > + clocks = <&can1_clk>, <&can1_gclk>; > > + clock-names = "hclk", "cclk"; > > + assigned-clocks = <&can1_gclk>; > > + assigned-clock-parents = <&utmi>; > > + assigned-clock-rates = <40000000>; > > + bosch,mram-cfg = <0x1100 0 0 64 0 0 32 32>; > > + status = "disabled"; > > + }; > > + > > chipid@fc069000 { > > compatible = "atmel,sama5d2-chipid"; > > reg = <0xfc069000 0x8>; > > Best Regards, > Wenyou Yang -- 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
