[PATCH v7 4/5] i2c: aspeed: added driver for Aspeed I2C

Brendan Higgins brendanhiggins at google.com
Tue May 9 09:28:44 AEST 2017


‚ÄčI would like to release another version this week or next week, and I
think that we are pretty closed to having something we can apply, but
before I do that, I want to get something resolved:

+static int __aspeed_i2c_init(struct aspeed_i2c_bus *bus,
> +                            struct platform_device *pdev)
> +{
> +       int ret;
> +
> +       /* Disable everything. */
> +       writel(0, bus->base + ASPEED_I2C_FUN_CTRL_REG);
> +
> +       ret = __aspeed_i2c_init_clk(bus, pdev);
> +       if (ret < 0)
> +               return ret;
> +
> +       /* Enable Master Mode */
> +       writel(readl(bus->base + ASPEED_I2C_FUN_CTRL_REG) |
> +              ASPEED_I2CD_MASTER_EN |
> +              /* TODO: provide device tree option for multi-master mode.
> */


I am curious what everyone thinks about this. It seemed that, earlier on,
people did not like me disabling multi-master mode, but I think that it
would make bus recovery not work as well. Given that, I think it makes the
most sense to provide a device tree option either to enable multi-master
support or disable it. Thoughts?


>
> +              ASPEED_I2CD_MULTI_MASTER_DIS,
> +              bus->base + ASPEED_I2C_FUN_CTRL_REG);
> +
> +       /* Set interrupt generation of I2C controller */
> +       writel(ASPEED_I2CD_INTR_ALL, bus->base + ASPEED_I2C_INTR_CTRL_REG);
> +
> +       return 0;
> +}
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