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SubjectRe: [PATCH] gpio: enable expander pca957x
On Fri, Mar 18, 2011 at 12:04:58PM +0800, Haojian Zhuang wrote:
> Support both PCA9574(8-bit) and PCA9575(16-bit) gpio expander.
>
> Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
> ---
> drivers/gpio/Kconfig | 14 ++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/pca957x.c | 491 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/i2c/pca957x.h | 28 +++
> 4 files changed, 534 insertions(+), 0 deletions(-)
> create mode 100644 drivers/gpio/pca957x.c
> create mode 100644 include/linux/i2c/pca957x.h
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 7ef9108..28be09a 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -191,6 +191,20 @@ config GPIO_PCA953X_IRQ
> Say yes here to enable the pca953x to be used as an interrupt
> controller. It requires the driver to be built in the kernel.
>
> +config GPIO_PCA957X
> + tristate "PCA957x I/O ports"
> + depends on I2C
> + help
> + Say yes here to provide access several register-oriented
> + SMBus I/O expanders. Compatible models include:
> +
> + 8 bits: pca9574
> +
> + 16 bits: pca9575
> +
> + This driver can also be built as a module. If so, the module
> + will be called pca957x
> +
> config GPIO_PCF857X
> tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
> depends on I2C
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 3351cf8..6d941bd 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_GPIO_MC33880) += mc33880.o
> obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
> obj-$(CONFIG_GPIO_74X164) += 74x164.o
> obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
> +obj-$(CONFIG_GPIO_PCA957X) += pca957x.o
> obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
> obj-$(CONFIG_GPIO_PCH) += pch_gpio.o
> obj-$(CONFIG_GPIO_PL061) += pl061.o
> diff --git a/drivers/gpio/pca957x.c b/drivers/gpio/pca957x.c
> new file mode 100644
> index 0000000..9d8ceb1
> --- /dev/null
> +++ b/drivers/gpio/pca957x.c
> @@ -0,0 +1,491 @@
> +/*
> + * pca957x.c - 8/16 bit I/O ports
> + *
> + * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
> + * Copyright (C) 2007 Marvell International Ltd.
> + *
> + * Derived from drivers/i2c/chips/pca9539.c

It would appear that the driver is well near identical to
drivers/gpio/pca953x.c, except that this version accesses the
registers with a different word width and without the mutex locking.

Why can't the pca957x device be supported by the pca953x driver?

g.


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