Re: [PATCHv2 1/8] ARM: at91: Add at91sam9rl DT SoC support

Alexandre Belloni
2014-02-19T17:31:45Z

On 19/02/2014 at 17:00:20 +0000, Mark Rutland wrote :
> On Wed, Feb 19, 2014 at 03:32:24PM +0000, Alexandre Belloni wrote:
> > This adds preliminary DT support for the at91sam9rl.
> >
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> > ---
> > arch/arm/boot/dts/at91sam9rl.dtsi | 628 ++++++++++++++++++++++++++++++++++++++
> > arch/arm/mach-at91/at91sam9rl.c | 16 +
> > 2 files changed, 644 insertions(+)
> > create mode 100644 arch/arm/boot/dts/at91sam9rl.dtsi
>
> [...]
>
> > + tcb0: timer@fffa0000 {
> > + compatible = "atmel,at91rm9200-tcb";
> > + reg = <0xfffa0000 0x100>;
> > + interrupts = <16 IRQ_TYPE_LEVEL_HIGH 0
> > + 17 IRQ_TYPE_LEVEL_HIGH 0
> > + 18 IRQ_TYPE_LEVEL_HIGH 0>;
> > + };
>
> Nit: please bracket list entries individually. Also for other list
> properties like reg and (*-)gpio(s).
>

OK.

> [...]
>
> > + adc0: adc@fffd0000 {
> > + compatible = "atmel,at91sam9260-adc";
> > + reg = <0xfffd0000 0x100>;
> > + interrupts = <20 IRQ_TYPE_LEVEL_HIGH 0>;
> > + atmel,adc-use-external-triggers;
> > + atmel,adc-channels-used = <0xf>;
> > + atmel,adc-vref = <3300>;
> > + atmel,adc-num-channels = <4>;
> > + atmel,adc-startup-time = <15>;
> > + atmel,adc-channel-base = <0x30>;
> > + atmel,adc-drdy-mask = <0x10000>;
> > + atmel,adc-status-register = <0x1c>;
> > + atmel,adc-trigger-register = <0x04>;
> > + atmel,adc-res = <8 10>;
> > + atmel,adc-res-names = "lowres", "highres";
> > + atmel,adc-use-res = "highres";
> > +
> > + trigger@0 {
> > + trigger-name = "timer-counter-0";
> > + trigger-value = <0x1>;
> > + };
>
> A unit-address should go with a reg value. Either this needs a reg and
> the parent node needs #address-cells and #size-cells, or the
> unit-address should go, and the names made unique through other means.
>

OK, I guess I'll have to fix
Documentation/devicetree/bindings/arm/atmel-adc.txt too.

> [...]
>
> > + pinctrl@fffff400 {
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > + compatible = "atmel,at91rm9200-pinctrl", "simple-bus";
>
> NAK. Either this is a atmel,at91rm9200-pinctrl node or a simple-bus. Not
> both; that doesn't make any sense.
>

Simply a copy paste, I'll fix that here and also the 6 other atmel
dtsi includes.

What is your preference for those using:
compatible = "atmel,at91sam9x5-pinctrl", "atmel,at91rm9200-pinctrl", "simple-bus"; ?

> > diff --git a/arch/arm/mach-at91/at91sam9rl.c b/arch/arm/mach-at91/at91sam9rl.c
> > index 3651517abedf..d6ee8bb47213 100644
> > --- a/arch/arm/mach-at91/at91sam9rl.c
> > +++ b/arch/arm/mach-at91/at91sam9rl.c
> > @@ -196,6 +196,22 @@ static struct clk_lookup periph_clocks_lookups[] = {
> > CLKDEV_CON_ID("pioB", &pioB_clk),
> > CLKDEV_CON_ID("pioC", &pioC_clk),
> > CLKDEV_CON_ID("pioD", &pioD_clk),
> > + /* more lookup table for DT entries */
> > + CLKDEV_CON_DEV_ID("usart", "fffff200.serial", &mck),
> > + CLKDEV_CON_DEV_ID("usart", "fffb0000.serial", &usart0_clk),
> > + CLKDEV_CON_DEV_ID("usart", "ffffb400.serial", &usart1_clk),
> > + CLKDEV_CON_DEV_ID("usart", "ffffb800.serial", &usart2_clk),
> > + CLKDEV_CON_DEV_ID("usart", "ffffbc00.serial", &usart3_clk),
> > + CLKDEV_CON_DEV_ID("t0_clk", "fffa0000.timer", &tc0_clk),
> > + CLKDEV_CON_DEV_ID("t1_clk", "fffa0000.timer", &tc1_clk),
> > + CLKDEV_CON_DEV_ID("t2_clk", "fffa0000.timer", &tc2_clk),
> > + CLKDEV_CON_DEV_ID("mci_clk", "fffa4000.mmc", &mmc_clk),
> > + CLKDEV_CON_DEV_ID(NULL, "fffa8000.i2c", &twi0_clk),
> > + CLKDEV_CON_DEV_ID(NULL, "fffac000.i2c", &twi1_clk),
> > + CLKDEV_CON_DEV_ID(NULL, "fffff400.gpio", &pioA_clk),
> > + CLKDEV_CON_DEV_ID(NULL, "fffff600.gpio", &pioB_clk),
> > + CLKDEV_CON_DEV_ID(NULL, "fffff800.gpio", &pioC_clk),
> > + CLKDEV_CON_DEV_ID(NULL, "fffffa00.gpio", &pioD_clk),
>
> Why can't these clocks be described in the DT?
>

The issue is twofold:
- At that point in the series, at91sam9 SoCs are not supported through
the CCF.
- Even after supporting CCF, the at91_dt_defconfig is selecting at91
SoCs that are not supported through the CCF hence preventing us from
using it.

--
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering