From 5de6baef9b5d9e3a84e0c3752cfb7eaef2eb1a0f Mon Sep 17 00:00:00 2001
From: notro <notro@tronnes.org>
Date: Sun, 27 Jul 2014 20:12:58 +0200
Subject: [PATCH 052/114] spi: bcm2708: add device tree support
Add DT support to driver and add to .dtsi file.
Setup pins and spidev in .dts file.
SPI is disabled by default.
Signed-off-by: Noralf Tronnes <notro@tronnes.org>
BCM2708: don't register SPI controller when using DT
The device for the SPI controller is in the Device Tree.
Only register the device when not using DT.
Signed-off-by: Noralf Tronnes <notro@tronnes.org>
spi: bcm2835: make driver available on ARCH_BCM2708
Make this driver available on ARCH_BCM2708
Signed-off-by: Noralf Tronnes <notro@tronnes.org>
bcm2708: Remove the prohibition on mixing SPIDEV and DT
---
arch/arm/boot/dts/bcm2708-rpi-b.dts | 32 ++++++++++++++++++++++++++++++++
arch/arm/boot/dts/bcm2708.dtsi | 18 ++++++++++++++++++
arch/arm/mach-bcm2708/bcm2708.c | 19 ++++++++++++++++---
drivers/spi/Kconfig | 2 +-
drivers/spi/spi-bcm2708.c | 8 ++++++++
5 files changed, 75 insertions(+), 4 deletions(-)
--- a/arch/arm/boot/dts/bcm2708-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2708-rpi-b.dts
@@ -5,4 +5,36 @@
/ {
compatible = "brcm,bcm2708";
model = "Raspberry Pi";
+
+ aliases {
+ spi0 = &spi0;
+ };
+};
+
+&gpio {
+ spi0_pins: spi0_pins {
+ brcm,pins = <7 8 9 10 11>;
+ brcm,function = <4>; /* alt0 */
+ };
+};
+
+&spi0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi0_pins>;
+
+ spidev@0{
+ compatible = "spidev";
+ reg = <0>; /* CE0 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <500000>;
+ };
+
+ spidev@1{
+ compatible = "spidev";
+ reg = <1>; /* CE1 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <500000>;
+ };
};
--- a/arch/arm/boot/dts/bcm2708.dtsi
+++ b/arch/arm/boot/dts/bcm2708.dtsi
@@ -38,11 +38,29 @@
interrupt-controller;
#interrupt-cells = <2>;
};
+
+ spi0: spi@7e204000 {
+ compatible = "brcm,bcm2708-spi";
+ reg = <0x7e204000 0x1000>;
+ interrupts = <2 22>;
+ clocks = <&clk_spi>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "disabled";
+ };
};
clocks {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <0>;
+
+ clk_spi: clock@2 {
+ compatible = "fixed-clock";
+ reg = <2>;
+ #clock-cells = <0>;
+ clock-output-names = "spi";
+ clock-frequency = <250000000>;
+ };
};
};
--- a/arch/arm/mach-bcm2708/bcm2708.c
+++ b/arch/arm/mach-bcm2708/bcm2708.c
@@ -486,6 +486,7 @@ static struct platform_device bcm2708_al
},
};
+#ifndef CONFIG_OF
static struct resource bcm2708_spi_resources[] = {
{
.start = SPI0_BASE,
@@ -509,6 +510,7 @@ static struct platform_device bcm2708_sp
.dma_mask = &bcm2708_spi_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON)},
};
+#endif
#ifdef CONFIG_BCM2708_SPIDEV
static struct spi_board_info bcm2708_spi_devices[] = {
@@ -670,6 +672,16 @@ int __init bcm_register_device(struct pl
return ret;
}
+/*
+ * Use this macro for platform devices that are present in the Device Tree.
+ * This way the device is only added on non-DT builds.
+ */
+#ifdef CONFIG_OF
+#define bcm_register_device_dt(pdev)
+#else
+#define bcm_register_device_dt(pdev) bcm_register_device(pdev)
+#endif
+
int calc_rsts(int partition)
{
return PM_PASSWORD |
@@ -784,7 +796,7 @@ void __init bcm2708_init(void)
for (i = 0; i < ARRAY_SIZE(bcm2708_alsa_devices); i++)
bcm_register_device(&bcm2708_alsa_devices[i]);
- bcm_register_device(&bcm2708_spi_device);
+ bcm_register_device_dt(&bcm2708_spi_device);
bcm_register_device(&bcm2708_bsc0_device);
bcm_register_device(&bcm2708_bsc1_device);
@@ -824,8 +836,9 @@ void __init bcm2708_init(void)
system_serial_low = serial;
#ifdef CONFIG_BCM2708_SPIDEV
- spi_register_board_info(bcm2708_spi_devices,
- ARRAY_SIZE(bcm2708_spi_devices));
+ if (!use_dt)
+ spi_register_board_info(bcm2708_spi_devices,
+ ARRAY_SIZE(bcm2708_spi_devices));
#endif
}
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -77,7 +77,7 @@ config SPI_ATMEL
config SPI_BCM2835
tristate "BCM2835 SPI controller"
- depends on ARCH_BCM2835 || COMPILE_TEST
+ depends on ARCH_BCM2835 || ARCH_BCM2708 || COMPILE_TEST
help
This selects a driver for the Broadcom BCM2835 SPI master.
--- a/drivers/spi/spi-bcm2708.c
+++ b/drivers/spi/spi-bcm2708.c
@@ -512,6 +512,7 @@ static int bcm2708_spi_probe(struct plat
master->setup = bcm2708_spi_setup;
master->transfer = bcm2708_spi_transfer;
master->cleanup = bcm2708_spi_cleanup;
+ master->dev.of_node = pdev->dev.of_node;
platform_set_drvdata(pdev, master);
bs = spi_master_get_devdata(master);
@@ -596,10 +597,17 @@ static int bcm2708_spi_remove(struct pla
return 0;
}
+static const struct of_device_id bcm2708_spi_match[] = {
+ { .compatible = "brcm,bcm2708-spi", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, bcm2708_spi_match);
+
static struct platform_driver bcm2708_spi_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
+ .of_match_table = bcm2708_spi_match,
},
.probe = bcm2708_spi_probe,
.remove = bcm2708_spi_remove,