From: Vaibhav Hiremath Date: Tue, 14 Jul 2015 07:36:41 +0000 (+0530) Subject: i2c: pxa: No need to set slave addr for i2c master mode reset X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e087b4272effeacc10629316d47a257c88f82898;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git i2c: pxa: No need to set slave addr for i2c master mode reset Normally i2c controller works as master, so slave addr is not needed, or it will impact some slave device (eg. ST NFC chip) i2c accesses, because it has the same i2c address with controller. For example, On the pxa1928 based platform, where PMIC (88pm860) is present @0x30 address on TWSI0 interface, and if we set 0x30 as a slave address in pxa1928 TWSI0 module, all the transactions towards PMIC would go for toss. Signed-off-by: Jett.Zhou Signed-off-by: Vaibhav Hiremath Acked-by: Robert Jarzmik Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index f4ac8c595a45..023e59fda650 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -459,7 +459,7 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c) writel(I2C_ISR_INIT, _ISR(i2c)); writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c)); - if (i2c->reg_isar) + if (i2c->reg_isar && IS_ENABLED(CONFIG_I2C_PXA_SLAVE)) writel(i2c->slave_addr, _ISAR(i2c)); /* set control register values */