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i2c: mv64xxx: Fix clock resource by adding an optional bus clock

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On Armada 7K/8K we need to explicitly enable the bus clock. The bus clock
is optional because not all the SoCs need them but at least for Armada
7K/8K it is actually mandatory.

The binding documentation is updating accordingly.

Signed-off-by: Gregory CLEMENT <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
This commit is contained in:
Gregory CLEMENT 2018-01-16 17:35:39 +01:00 • committed by Wolfram Sang
commit 1534156e99
2 changed files with 31 additions and 1 deletions
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12
drivers/i2c/busses/i2c-mv64xxx.c
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@ -135,6 +135,7 @@ struct mv64xxx_i2c_data {
u32 freq_m;
u32 freq_n;
struct clk *clk;
struct clk *reg_clk;
wait_queue_head_t waitq;
spinlock_t lock;
struct i2c_msg *msg;
@ -894,13 +895,20 @@ mv64xxx_i2c_probe(struct platform_device *pd)
init_waitqueue_head(&drv_data->waitq);
spin_lock_init(&drv_data->lock);
/* Not all platforms have a clk */
/* Not all platforms have clocks */
drv_data->clk = devm_clk_get(&pd->dev, NULL);
if (IS_ERR(drv_data->clk) && PTR_ERR(drv_data->clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (!IS_ERR(drv_data->clk))
clk_prepare_enable(drv_data->clk);
drv_data->reg_clk = devm_clk_get(&pd->dev, "reg");
if (IS_ERR(drv_data->reg_clk) &&
PTR_ERR(drv_data->reg_clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (!IS_ERR(drv_data->reg_clk))
clk_prepare_enable(drv_data->reg_clk);
drv_data->irq = platform_get_irq(pd, 0);
if (pdata) {
@ -950,6 +958,7 @@ exit_free_irq:
exit_reset:
reset_control_assert(drv_data->rstc);
exit_clk:
clk_disable_unprepare(drv_data->reg_clk);
clk_disable_unprepare(drv_data->clk);
return rc;
@ -963,6 +972,7 @@ mv64xxx_i2c_remove(struct platform_device *dev)
i2c_del_adapter(&drv_data->adapter);
free_irq(drv_data->irq, drv_data);
reset_control_assert(drv_data->rstc);
clk_disable_unprepare(drv_data->reg_clk);
clk_disable_unprepare(drv_data->clk);
return 0;