diff options
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-aspeed.txt | 7 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-aspeed.c | 12 |
2 files changed, 17 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt index bd6480b19535..e7106bfc1f13 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt @@ -7,7 +7,9 @@ Required Properties: - compatible : should be "aspeed,ast2400-i2c-bus" or "aspeed,ast2500-i2c-bus" - clocks : root clock of bus, should reference the APB - clock + clock in the second cell +- resets : phandle to reset controller with the reset number in + the second cell - interrupts : interrupt number - interrupt-parent : interrupt controller for bus, should reference a aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic @@ -40,7 +42,8 @@ i2c { #interrupt-cells = <1>; reg = <0x40 0x40>; compatible = "aspeed,ast2400-i2c-bus"; - clocks = <&clk_apb>; + clocks = <&syscon ASPEED_CLK_APB>; + resets = <&syscon ASPEED_RESET_I2C>; bus-frequency = <100000>; interrupts = <0>; interrupt-parent = <&i2c_ic>; diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c index 284f8670dbeb..7d4aeb4465b3 100644 --- a/drivers/i2c/busses/i2c-aspeed.c +++ b/drivers/i2c/busses/i2c-aspeed.c @@ -27,6 +27,7 @@ #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/reset.h> #include <linux/slab.h> /* I2C Register */ @@ -132,6 +133,7 @@ struct aspeed_i2c_bus { struct i2c_adapter adap; struct device *dev; void __iomem *base; + struct reset_control *rst; /* Synchronizes I/O mem access to base. */ spinlock_t lock; struct completion cmd_complete; @@ -847,6 +849,14 @@ static int aspeed_i2c_probe_bus(struct platform_device *pdev) /* We just need the clock rate, we don't actually use the clk object. */ devm_clk_put(&pdev->dev, parent_clk); + bus->rst = devm_reset_control_get_shared(&pdev->dev, NULL); + if (IS_ERR(bus->rst)) { + dev_err(&pdev->dev, + "missing or invalid reset controller device tree entry"); + return PTR_ERR(bus->rst); + } + reset_control_deassert(bus->rst); + ret = of_property_read_u32(pdev->dev.of_node, "bus-frequency", &bus->bus_frequency); if (ret < 0) { @@ -917,6 +927,8 @@ static int aspeed_i2c_remove_bus(struct platform_device *pdev) spin_unlock_irqrestore(&bus->lock, flags); + reset_control_assert(bus->rst); + i2c_del_adapter(&bus->adap); return 0; |