From: Andy Green Date: Mon, 30 May 2011 14:43:04 +0000 (-0700) Subject: I2C: OMAP2+: Name registers in I2C IP V2 only accordingly X-Git-Tag: firefly_0821_release~3680^2~4244^2~18 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b88530884141e977b3702d8e82de52e553b45876;p=firefly-linux-kernel-4.4.55.git I2C: OMAP2+: Name registers in I2C IP V2 only accordingly The OMAP I2C driver dynamically chooses between two register sets of differing sizes depending on the cpu type it finds itself on. It has been observed that the existing code references non-existing registers on OMAP3530, because while it correctly chose the smaller register layout based on cpu type, the code uses the probed register ID to decide if to execute code referencing an extra register, and both register layout devices on OMAP3530 and OMAP4430 report the same probed ID of 0x40. This patch changes the extended register names only found on IP V2 of the I2C peripheral unit accordingly to help show up errors in usage. Cc: patches@linaro.org Reported-by: Peter Maydell Signed-off-by: Andy Green Signed-off-by: Tony Lindgren Acked-by: Ben Dooks Signed-off-by: Kevin Hilman --- diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 2dfb63176856..d40943c23fcc 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -72,11 +72,12 @@ enum { OMAP_I2C_SCLH_REG, OMAP_I2C_SYSTEST_REG, OMAP_I2C_BUFSTAT_REG, - OMAP_I2C_REVNB_LO, - OMAP_I2C_REVNB_HI, - OMAP_I2C_IRQSTATUS_RAW, - OMAP_I2C_IRQENABLE_SET, - OMAP_I2C_IRQENABLE_CLR, + /* only on OMAP4430 */ + OMAP_I2C_IP_V2_REVNB_LO, + OMAP_I2C_IP_V2_REVNB_HI, + OMAP_I2C_IP_V2_IRQSTATUS_RAW, + OMAP_I2C_IP_V2_IRQENABLE_SET, + OMAP_I2C_IP_V2_IRQENABLE_CLR, }; /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ @@ -244,11 +245,11 @@ static const u8 omap4_reg_map[] = { [OMAP_I2C_SCLH_REG] = 0xb8, [OMAP_I2C_SYSTEST_REG] = 0xbC, [OMAP_I2C_BUFSTAT_REG] = 0xc0, - [OMAP_I2C_REVNB_LO] = 0x00, - [OMAP_I2C_REVNB_HI] = 0x04, - [OMAP_I2C_IRQSTATUS_RAW] = 0x24, - [OMAP_I2C_IRQENABLE_SET] = 0x2c, - [OMAP_I2C_IRQENABLE_CLR] = 0x30, + [OMAP_I2C_IP_V2_REVNB_LO] = 0x00, + [OMAP_I2C_IP_V2_REVNB_HI] = 0x04, + [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24, + [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c, + [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30, }; static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, @@ -309,7 +310,7 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); if (dev->rev >= OMAP_I2C_REV_ON_4430) - omap_i2c_write_reg(dev, OMAP_I2C_IRQENABLE_CLR, 1); + omap_i2c_write_reg(dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1); else omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);