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| author | Peter Rosin <peda@axentia.se> | 2016-12-02 11:51:14 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-12-07 15:27:02 +0100 |
| commit | 6c4ef627d8c458fe8880ccd2e2cd581de0d9b42f (patch) | |
| tree | f3f5e3e3302205c38aac6874fb1e2603e05ab8e7 /drivers/pinctrl/pinctrl-sx150x.c | |
| parent | 222ed59e8dace1c325c30dbee1b0161cf7eff2c7 (diff) | |
| download | talos-obmc-linux-6c4ef627d8c458fe8880ccd2e2cd581de0d9b42f.tar.gz talos-obmc-linux-6c4ef627d8c458fe8880ccd2e2cd581de0d9b42f.zip | |
pinctrl: sx150x: access the correct bits in the 4-bit regs of sx150[147]
The code assumes 8-bit or 16-bit width registers, but three of the
chips (sx1501/sx1504/sx1507) are 4-bit. So, try to handle 4-bit chips as
well, they leave the high part of each register unused.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-sx150x.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-sx150x.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pinctrl/pinctrl-sx150x.c b/drivers/pinctrl/pinctrl-sx150x.c index 1a1c8b51a992..a121819ffc92 100644 --- a/drivers/pinctrl/pinctrl-sx150x.c +++ b/drivers/pinctrl/pinctrl-sx150x.c @@ -5,6 +5,7 @@ * Copyright (c) 2010, Code Aurora Forum. All rights reserved. * * Driver for Semtech SX150X I2C GPIO Expanders + * The handling of the 4-bit chips (SX1501/SX1504/SX1507) is untested. * * Author: Gregory Bean <gbean@codeaurora.org> * @@ -1088,7 +1089,7 @@ static int sx150x_regmap_reg_write(void *context, unsigned int reg, val = sx150x_maybe_swizzle(pctl, reg, val); - n = width - 8; + n = (width - 1) & ~7; do { const u8 byte = (val >> n) & 0xff; |
