i2c: meson: add configurable divider factors
This patch try to add support for I2C controller in Meson-AXG SoC, Due to the IP changes between I2C controller, we need to introduce a compatible data to make the divider factor configurable. Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Jian Hu <jian.hu@amlogic.com> Signed-off-by: Yixun Lan <yixun.lan@amlogic.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -16,6 +16,7 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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@ -57,6 +58,10 @@ enum {
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STATE_WRITE,
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};
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struct meson_i2c_data {
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unsigned char div_factor;
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};
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/**
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* struct meson_i2c - Meson I2C device private data
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*
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@ -93,6 +98,8 @@ struct meson_i2c {
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struct completion done;
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u32 tokens[2];
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int num_tokens;
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const struct meson_i2c_data *data;
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};
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static void meson_i2c_set_mask(struct meson_i2c *i2c, int reg, u32 mask,
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@ -128,7 +135,7 @@ static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq)
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unsigned long clk_rate = clk_get_rate(i2c->clk);
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unsigned int div;
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div = DIV_ROUND_UP(clk_rate, freq * 4);
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div = DIV_ROUND_UP(clk_rate, freq * i2c->data->div_factor);
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/* clock divider has 12 bits */
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if (div >= (1 << 12)) {
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@ -376,6 +383,9 @@ static int meson_i2c_probe(struct platform_device *pdev)
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spin_lock_init(&i2c->lock);
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init_completion(&i2c->done);
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i2c->data = (const struct meson_i2c_data *)
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of_device_get_match_data(&pdev->dev);
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i2c->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(i2c->clk)) {
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dev_err(&pdev->dev, "can't get device clock\n");
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@ -440,11 +450,25 @@ static int meson_i2c_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct of_device_id meson_i2c_match[] = {
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{ .compatible = "amlogic,meson6-i2c" },
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{ .compatible = "amlogic,meson-gxbb-i2c" },
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{ },
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static const struct meson_i2c_data i2c_meson6_data = {
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.div_factor = 4,
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};
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static const struct meson_i2c_data i2c_gxbb_data = {
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.div_factor = 4,
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};
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static const struct meson_i2c_data i2c_axg_data = {
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.div_factor = 3,
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};
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static const struct of_device_id meson_i2c_match[] = {
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{ .compatible = "amlogic,meson6-i2c", .data = &i2c_meson6_data },
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{ .compatible = "amlogic,meson-gxbb-i2c", .data = &i2c_gxbb_data },
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{ .compatible = "amlogic,meson-axg-i2c", .data = &i2c_axg_data },
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{},
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};
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MODULE_DEVICE_TABLE(of, meson_i2c_match);
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static struct platform_driver meson_i2c_driver = {
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