diff options
| author | Arseny Solokha <asolokha@kb.kras.ru> | 2017-12-07 17:20:02 +0700 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2018-01-15 19:16:14 +0100 |
| commit | 7575a745f9ea12d7fdbc7cf02c862bad0a47c50f (patch) | |
| tree | b4178fb80fbad9d04362eec15514f78ef3856f5c /drivers/i2c | |
| parent | f6214f6f2b11e696a83b97f90b7a0f04efb8ec09 (diff) | |
| download | linux-7575a745f9ea12d7fdbc7cf02c862bad0a47c50f.tar.bz2 | |
i2c: mpc: fix PORDEVSR2 mask for MPC8533/44
According to the reference manuals for the corresponding SoCs, SEC
frequency ratio configuration is indicated by bit 26 of the POR Device
Status Register 2. Consequently, SEC_CFG bit should be tested by mask 0x20,
not 0x80. Testing the wrong bit leads to selection of wrong I2C clock
prescaler on those SoCs.
Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mpc.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index 648a5afded64..aac0ec6dc5fc 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -332,14 +332,18 @@ static u32 mpc_i2c_get_sec_cfg_8xxx(void) if (prop) { /* * Map and check POR Device Status Register 2 - * (PORDEVSR2) at 0xE0014 + * (PORDEVSR2) at 0xE0014. Note than while MPC8533 + * and MPC8544 indicate SEC frequency ratio + * configuration as bit 26 in PORDEVSR2, other MPC8xxx + * parts may store it differently or may not have it + * at all. */ reg = ioremap(get_immrbase() + *prop + 0x14, 0x4); if (!reg) printk(KERN_ERR "Error: couldn't map PORDEVSR2\n"); else - val = in_be32(reg) & 0x00000080; /* sec-cfg */ + val = in_be32(reg) & 0x00000020; /* sec-cfg */ iounmap(reg); } } |