[PATCH 10/10] ARM: ux500: Enable PL022 SSP Controller in Device Tree
Arnd Bergmann
arnd at arndb.de
Wed Mar 14 10:05:49 EDT 2012
On Wednesday 14 March 2012, Lee Jones wrote:
> This SSP Controller supports a number of serial communication methods.
>
> Namely:
>
> /**
> * enum ssp_interface - interfaces allowed for this SSP Controller
> * @SSP_INTERFACE_MOTOROLA_SPI: Motorola Interface
> * @SSP_INTERFACE_TI_SYNC_SERIAL: Texas Instrument Synchronous Serial
> * interface
> * @SSP_INTERFACE_NATIONAL_MICROWIRE: National Semiconductor Microwire
> * interface
> * @SSP_INTERFACE_UNIDIRECTIONAL: Unidirectional interface (STn8810
> * &STn8815 only)
> */
>
> ... and as such cannot be registered using of_register_spi_devices.
> Instead it can be registered simply as a primecell device.
>
> Signed-off-by: Lee Jones <lee.jones at linaro.org>
Looks good to me, but this one needs review from Grant as the maintainer
for both device tree and SPI.
For this to be functional, I think you also need a way for the SPI
controller to find the child devices from the device tree, but I
don't see how ux500 currently does it, or how it should be done.
Acked-by: Arnd Bergmann <arnd at arndb.de>
> ---
> arch/arm/boot/dts/db8500.dtsi | 5 ++++-
> arch/arm/mach-ux500/board-mop500.c | 6 +++---
> 2 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/boot/dts/db8500.dtsi b/arch/arm/boot/dts/db8500.dtsi
> index 6ae7f69..a9866a3 100644
> --- a/arch/arm/boot/dts/db8500.dtsi
> +++ b/arch/arm/boot/dts/db8500.dtsi
> @@ -206,11 +206,14 @@
> ssp at 80002000 {
> compatible = "arm,pl022", "arm,primecell";
> reg = <80002000 0x1000>;
> - interrupts = <14>;
> + interrupts = <0 14 4>;
> #address-cells = <1>;
> #size-cells = <0>;
> status = "disabled";
> +
> + // Add one of these for each child device
> cs-gpios = <&gpio0 31 &gpio4 14 &gpio4 16 &gpio6 22 &gpio7 0>;
> +
> };
>
> uart at 80120000 {
> diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c
> index ea0242a..d0799d5 100644
> --- a/arch/arm/mach-ux500/board-mop500.c
> +++ b/arch/arm/mach-ux500/board-mop500.c
> @@ -443,7 +443,7 @@ static struct stedma40_chan_cfg ssp0_dma_cfg_tx = {
> };
> #endif
>
> -static struct pl022_ssp_controller ssp0_platform_data = {
> +static struct pl022_ssp_controller ssp0_plat = {
> .bus_id = 0,
> #ifdef CONFIG_STE_DMA40
> .enable_dma = 1,
> @@ -461,7 +461,7 @@ static struct pl022_ssp_controller ssp0_platform_data = {
>
> static void __init mop500_spi_init(struct device *parent)
> {
> - db8500_add_ssp0(parent, &ssp0_platform_data);
> + db8500_add_ssp0(parent, &ssp0_plat);
> }
>
> #ifdef CONFIG_STE_DMA40
> @@ -749,6 +749,7 @@ struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
> OF_DEV_AUXDATA("arm,pl011", 0x80120000, "uart0", &uart0_plat),
> OF_DEV_AUXDATA("arm,pl011", 0x80121000, "uart1", &uart1_plat),
> OF_DEV_AUXDATA("arm,pl011", 0x80007000, "uart2", &uart2_plat),
> + OF_DEV_AUXDATA("arm,pl022", 0x80002000, "ssp0", &ssp0_plat),
> {},
> };
>
> @@ -804,7 +805,6 @@ static void __init u8500_init_machine(void)
> hrefv60_sdi_init(parent);
> }
> mop500_i2c_init(parent);
> - mop500_spi_init(parent);
>
> i2c_register_board_info(0, mop500_i2c0_devices, i2c0_devs);
> i2c_register_board_info(2, mop500_i2c2_devices,
> --
> 1.7.5.4
>
>
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