On Sat, Mar 21, 2015 at 02:05:22PM +0800, Eddie Huang wrote:
> Add mediatek MT8173 I2C controller driver. Compare to I2C controller
> of earlier mediatek SoC, MT8173 fix write-then-read limitation, and
> also increase message size to 64kb.
>
[...]
> +static const struct i2c_adapter_quirks mt8173_i2c_quirks = {
> + .max_num_msgs = MAX_MSG_NUM_MT8173,
> + .max_write_len = MAX_DMA_TRANS_SIZE_MT8173,
> + .max_read_len = MAX_DMA_TRANS_SIZE_MT8173,
> + .max_comb_1st_msg_len = MAX_DMA_TRANS_SIZE_MT8173,
> + .max_comb_2nd_msg_len = MAX_WRRD_TRANS_SIZE_MT8173,
> +};
> +
> static int mtk_i2c_probe(struct platform_device *pdev)
> {
> int ret = 0;
> @@ -587,7 +626,8 @@ static int mtk_i2c_probe(struct platform_device *pdev)
> return -EINVAL;
>
> i2c->platform_compat = mtk_get_device_prop(pdev);
> - if (i2c->have_pmic && (i2c->platform_compat & COMPAT_MT6577))
> + if (i2c->have_pmic && (i2c->platform_compat &
> + (COMPAT_MT6577 | COMPAT_MT8173)))
> return -EINVAL;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -613,7 +653,10 @@ static int mtk_i2c_probe(struct platform_device *pdev)
> i2c->adap.dev.parent = &pdev->dev;
> i2c->adap.owner = THIS_MODULE;
> i2c->adap.algo = &mtk_i2c_algorithm;
> - i2c->adap.quirks = &mt6577_i2c_quirks;
> + if (i2c->platform_compat & COMPAT_MT8173)
> + i2c->adap.quirks = &mt8173_i2c_quirks;
> + else
> + i2c->adap.quirks = &mt6577_i2c_quirks;
Instead of putting an integer into struct of_device_id you should
introduce a
struct mtk_i2c_data {
struct i2c_adapter_quirks quirks;
int compat;
/* Additional SoC specific data */
};
and put a pointer to this directly into the of_device_id. This way you
need less casting and can put newly discovered differences diretly into
some data struct and don't have to introduce if(socxy) ... else ...
everytime.
Sascha
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