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| author |   Linus Walleij <linus.walleij@linaro.org> | 2019-06-01 00:37:56 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2019-06-12 13:20:23 +0200 |
| commit | fdb7e884ad617f8aa69abdd7f39e3fdac85e081e (patch) | |
| tree | 8040de47cccdb9797aa15272df7d0afde3431307 /arch/arm/include/asm/hardware | |
| parent | i2c: s3c2410: Convert to use GPIO descriptors (diff) | |
| download | linux-dev-fdb7e884ad617f8aa69abdd7f39e3fdac85e081e.tar.xz linux-dev-fdb7e884ad617f8aa69abdd7f39e3fdac85e081e.zip | |
i2c: iop: Use GPIO descriptors
The IOP3xx has some elaborate code to directly slam the
GPIO lines multiplexed with I2C down low before enablement,
apparently a workaround for a hardware bug found in the
early chips.
After consulting the developer documentation for IOP80321
and IOP80331 I can clearly see that this may be useful for
IOP80321 family (mach-iop32x) but it is highly dubious for
any 80331 series or later chip: in these chips the lines
are not multiplexed for UARTs.
We convert the code to pass optional GPIO descriptors
and register these only on the 80321-based boards where
it makes sense, optionally obtain them in the driver and
use the gpiod_set_raw_value() to ascertain the line gets
driven low when needed.
The GPIO driver does not give the GPIO chip a reasonable
label so the patch also adds that so that these machine
descriptor tables can be used.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'arch/arm/include/asm/hardware')
| -rw-r--r-- | arch/arm/include/asm/hardware/iop3xx.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/include/asm/hardware/iop3xx.h b/arch/arm/include/asm/hardware/iop3xx.h index 2594a95ff19a..a15d08160e8f 100644 --- a/arch/arm/include/asm/hardware/iop3xx.h +++ b/arch/arm/include/asm/hardware/iop3xx.h @@ -305,6 +305,8 @@ extern struct platform_device iop3xx_dma_1_channel; extern struct platform_device iop3xx_aau_channel; extern struct platform_device iop3xx_i2c0_device; extern struct platform_device iop3xx_i2c1_device; +extern struct gpiod_lookup_table iop3xx_i2c0_gpio_lookup; +extern struct gpiod_lookup_table iop3xx_i2c1_gpio_lookup; #endif |