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authorGraeme Smecher <gsmecher@threespeedlogic.com>2013-09-14 01:41:48 +0400
committerLinus Walleij <linus.walleij@linaro.org>2013-09-23 14:57:11 +0400
commite5304db8d7541c1338a6313ae951355b5a72cd19 (patch)
tree0e3fb0e5efe909e605900025d475bdaaeec5a763 /drivers/gpio/gpio-pca953x.c
parent8fa82b16304b5cdcddb929afbfebfddfb7adb716 (diff)
downloadlinux-e5304db8d7541c1338a6313ae951355b5a72cd19.tar.xz
gpio: pca953x: Don't flip bits on PCA957x GPIO expanders when probing them.
The pca957x driver supports a handful of I2C GPIO expanders from NXP, Maxim, and TI. For the PCA9574 and PCA9575 devices only, the driver resets the GPIO level and direction in the pca957x_probe function. This seems like the wrong thing to do, since it can cause hardware bit twiddles during warm reboots when the chip state and reset values don't match. This kind of initialization is best left upstream (in a bootloader) or downstream (in userspace). It's also an inconsistency across devices supported by this driver. This patch is NOT boot-tested: the SoC I'm using is stuck on 2.6.37, and the patch doesn't apply trivially. Signed-off-by: Graeme Smecher <gsmecher@threespeedlogic.com> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pca953x.c')
-rw-r--r--drivers/gpio/gpio-pca953x.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index cdd1aa12b895..6e48c07e3d8c 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -683,17 +683,6 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
int ret;
u8 val[MAX_BANK];
- /* Let every port in proper state, that could save power */
- memset(val, 0, NBANK(chip));
- pca953x_write_regs(chip, PCA957X_PUPD, val);
- memset(val, 0xFF, NBANK(chip));
- pca953x_write_regs(chip, PCA957X_CFG, val);
- memset(val, 0, NBANK(chip));
- pca953x_write_regs(chip, PCA957X_OUT, val);
-
- ret = pca953x_read_regs(chip, PCA957X_IN, val);
- if (ret)
- goto out;
ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
if (ret)
goto out;