hw/riscv/atlantis: Add some i2c peripherals
Add an I2C RTC device and a temperature sensor. These are not present on the board but help for testing. The tmp105 is a lm75 compatible temperature sensor used by the SENSORS_LM75 Linux kernel driver. The ds1338 is a RTC device that is used by the RTC_DRV_DS1307 Linux kernel driver. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Acked-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Message-ID: <20260630024952.1520546-13-joel@jms.id.au> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Joel Stanley committed
Jun 30, 2026 at 12:19 UTC
50cbe2343214dfcb85000cdd157c8ecbda6a8020
2 files changed
+29
hw/riscv/Kconfig
+2
@@ -130,6 +130,8 @@ config TENSTORRENT
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select SERIAL_MM
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select DEVICE_TREE
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select DESIGNWARE_I2C
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+ select DS1338
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+ select TMP105
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config XIANGSHAN_KUNMINGHU
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bool
hw/riscv/tt_atlantis.c
+27
@@ -64,6 +64,13 @@ static const MemMapEntry tt_atlantis_memmap[] = {
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[TT_ATL_DDR_HI] = { 0x100000000, 0x1000000000 },
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};
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+static I2CBus *i2c_get_bus(TTAtlantisState *s, unsigned busnr)
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+{
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+ assert(busnr < TT_ATL_NUM_I2C);
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+
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+ return s->i2c[busnr].bus;
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+}
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+
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static uint32_t fdt_phandle = 1;
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static uint32_t next_phandle(void)
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{
@@ -309,6 +316,19 @@ static void create_fdt_i2c(void *fdt, const MemMapEntry *mem, uint32_t irq,
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qemu_fdt_setprop_cell(fdt, name, "#size-cells", 0);
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}
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+static void create_fdt_i2c_device(TTAtlantisState *s, int bus,
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+ const char *compat, int addr)
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+{
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+ void *fdt = MACHINE(s)->fdt;
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+ hwaddr base = s->memmap[TT_ATL_I2C0 + bus].base;
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+ g_autofree char *name = g_strdup_printf("/soc/i2c@%"HWADDR_PRIX"/sensor@%x",
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+ base, addr);
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+
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+ qemu_fdt_add_subnode(fdt, name);
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+ qemu_fdt_setprop_string(fdt, name, "compatible", compat);
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+ qemu_fdt_setprop_cell(fdt, name, "reg", addr);
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+}
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+
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static void finalize_fdt(TTAtlantisState *s)
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{
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uint32_t aplic_s_phandle = next_phandle();
@@ -336,6 +356,9 @@ static void finalize_fdt(TTAtlantisState *s)
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TT_ATL_I2C0_IRQ + i,
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aplic_s_phandle, periph_clk_phandle);
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}
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+
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+ create_fdt_i2c_device(s, 0, "dallas,ds1338", 0x6f);
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+ create_fdt_i2c_device(s, 4, "ti,tmp105", 0x48);
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}
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static void create_fdt(TTAtlantisState *s)
@@ -551,6 +574,10 @@ static void tt_atlantis_machine_init(MachineState *machine)
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qdev_get_gpio_in(s->irqchip, TT_ATL_I2C0_IRQ + i));
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}
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+ /* I2C peripherals: qemu specific */
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+ i2c_slave_create_simple(i2c_get_bus(s, 0), "ds1338", 0x6f);
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+ i2c_slave_create_simple(i2c_get_bus(s, 4), "tmp105", 0x48);
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+
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/* Load or create device tree */
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if (machine->dtb) {
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load_fdt(s);