| Message ID | 20180110165147.26605-3-gregory.clement@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hello, On Wed, 10 Jan 2018 17:51:47 +0100, Gregory CLEMENT wrote: > 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. Seems like the binding documentation update is not part of this patch :) Thomas
Hi Thomas, On mer., janv. 10 2018, Thomas Petazzoni <thomas.petazzoni@free-electrons.com> wrote: > Hello, > > On Wed, 10 Jan 2018 17:51:47 +0100, Gregory CLEMENT wrote: >> 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. > > Seems like the binding documentation update is not part of this patch > :) Indeed, I forgot to do the "git commit --amend". Thanks, Gregory > > Thomas > -- > Thomas Petazzoni, CTO, Free Electrons > Embedded Linux and Kernel engineering > http://free-electrons.com
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c index f69066266faa..cce37d8ecf41 100644 --- a/drivers/i2c/busses/i2c-mv64xxx.c +++ b/drivers/i2c/busses/i2c-mv64xxx.c @@ -135,6 +135,7 @@ struct mv64xxx_i2c_data { u32 freq_m; u32 freq_n; struct clk *clk; + struct clk *axi_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->axi_clk = devm_clk_get(&pd->dev, "axi"); + if (IS_ERR(drv_data->axi_clk) && + PTR_ERR(drv_data->axi_clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (!IS_ERR(drv_data->axi_clk)) + clk_prepare_enable(drv_data->axi_clk); + drv_data->irq = platform_get_irq(pd, 0); if (pdata) { @@ -950,6 +958,7 @@ mv64xxx_i2c_probe(struct platform_device *pd) exit_reset: reset_control_assert(drv_data->rstc); exit_clk: + clk_disable_unprepare(drv_data->axi_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->axi_clk); clk_disable_unprepare(drv_data->clk); return 0;
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 <gregory.clement@free-electrons.com> --- drivers/i2c/busses/i2c-mv64xxx.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)