* Tony Lindgren <t...@atomide.com> [090304 13:51]:
> From: Jarkko Nikula <jarkko.nik...@nokia.com>
>
> This patch adds a new command line option "i2c_bus=bus_id,clkrate" into
> I2C bus registration helper. Purpose of the option is to override the
> default board specific bus speed which is supplied by the
> omap_register_i2c_bus.
>
> The default bus speed is typically set to speed of slowest I2C chip on the
> bus and overriding allow to use some experimental configurations or updated
> chip versions without any kernel modifications.
Jarkko, this should also be in Documentation/kernel-parameters.txt. Can
you please reply with a patch for that, and I'll fold it into this
patch?
Also, maybe it should be called omap_i2c_bus instead of i2c_bus?
Regards,
Tony
> Signed-off-by: Jarkko Nikula <jarkko.nik...@nokia.com>
> Signed-off-by: Tony Lindgren <t...@atomide.com>
> ---
> arch/arm/plat-omap/i2c.c | 54
> +++++++++++++++++++++++++++++++++++++---------
> 1 files changed, 44 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm/plat-omap/i2c.c b/arch/arm/plat-omap/i2c.c
> index 3e95954..aa70e43 100644
> --- a/arch/arm/plat-omap/i2c.c
> +++ b/arch/arm/plat-omap/i2c.c
> @@ -119,6 +119,46 @@ static void __init omap_i2c_mux_pins(int bus)
> omap_cfg_reg(scl);
> }
>
> +static int __init omap_i2c_nr_ports(void)
> +{
> + int ports = 0;
> +
> + if (cpu_class_is_omap1())
> + ports = 1;
> + else if (cpu_is_omap24xx())
> + ports = 2;
> + else if (cpu_is_omap34xx())
> + ports = 3;
> +
> + return ports;
> +}
> +
> +/**
> + * omap_i2c_bus_setup - Process command line options for the I2C bus speed
> + * @str: String of options
> + *
> + * This function allow to override the default I2C bus speed for given I2C
> + * bus with a command line option.
> + *
> + * Format: i2c_bus=bus_id,clkrate (in kHz)
> + *
> + * Returns 1 on success, 0 otherwise.
> + */
> +static int __init omap_i2c_bus_setup(char *str)
> +{
> + int ports;
> + int ints[3];
> +
> + ports = omap_i2c_nr_ports();
> + get_options(str, 3, ints);
> + if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
> + return 0;
> + i2c_rate[ints[1] - 1] = ints[2];
> +
> + return 1;
> +}
> +__setup("i2c_bus=", omap_i2c_bus_setup);
> +
> /**
> * omap_register_i2c_bus - register I2C bus with device descriptors
> * @bus_id: bus id counting from number 1
> @@ -132,19 +172,12 @@ int __init omap_register_i2c_bus(int bus_id, u32
> clkrate,
> struct i2c_board_info const *info,
> unsigned len)
> {
> - int ports, err;
> + int err;
> struct platform_device *pdev;
> struct resource *res;
> resource_size_t base, irq;
>
> - if (cpu_class_is_omap1())
> - ports = 1;
> - else if (cpu_is_omap24xx())
> - ports = 2;
> - else if (cpu_is_omap34xx())
> - ports = 3;
> -
> - BUG_ON(bus_id < 1 || bus_id > ports);
> + BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
>
> if (info) {
> err = i2c_register_board_info(bus_id, info, len);
> @@ -153,7 +186,8 @@ int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
> }
>
> pdev = &omap_i2c_devices[bus_id - 1];
> - *(u32 *)pdev->dev.platform_data = clkrate;
> + if (i2c_rate[bus_id - 1] == 0)
> + i2c_rate[bus_id - 1] = clkrate;
>
> if (bus_id == 1) {
> res = pdev->resource;
>
> --
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