Peripherals like I2C and SPI needs to be taken out of reset during board init for functioning properly. Hence, add `hi6220_periph_reset` function for doing the same. For instance without this function, I2C will fail like below while booting linux:
[ 0.608033] i2c_designware f7100000.i2c: Unknown Synopsys component type: 0x00000000 [ 0.621378] i2c_designware f7101000.i2c: Unknown Synopsys component type: 0x00000000 [ 0.633818] i2c_designware f7102000.i2c: Unknown Synopsys component type: 0x00000000
Signed-off-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org --- board/hisilicon/hikey/hikey.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/board/hisilicon/hikey/hikey.c b/board/hisilicon/hikey/hikey.c index 940ae82c45b..f8b8c372bfd 100644 --- a/board/hisilicon/hikey/hikey.c +++ b/board/hisilicon/hikey/hikey.c @@ -364,6 +364,20 @@ static void hi6220_pmussi_init(void) gpio_direction_output(0, 1); }
+static void hi6220_periph_reset(void) +{ + u32 data, bits; + + /* Bring I2C0/I2C1/I2C2/SPI0 out of reset */ + bits = PERI_RST3_I2C0 | PERI_RST3_I2C1 | PERI_RST3_I2C2 | PERI_RST3_SSP; + writel(bits, &peri_sc->rst3_dis); + + /* Wait until the peripherals are out of reset */ + do { + data = readl(&peri_sc->rst3_dis); + } while (data & bits); +} + int misc_init_r(void) { return 0; @@ -371,6 +385,8 @@ int misc_init_r(void)
int board_init(void) { + hi6220_periph_reset(); + return 0; }