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clk: x86: add "mclk" alias for Baytrail/Cherrytrail

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Due to timing requirements, TI and Conexant manage the audio
reference clock from their ASoC codec drivers using the "mclk"
string. This patch adds another lookup for the "pmc_plt_clk_3"
clock to avoid Intel-specific tests in those codec drivers and
use code as-is.

To avoid a leak, clk_add_alias() is not used in this patch.
Instead the lookup is created manually as part of the .probe()
step and dropped in the .remove() step.

"pmc_plt_clk_3" is used exclusively for audio on all known
Baytrail/CherryTrail designs and is e.g. routed on the MCLK
(pin 26) of the MinnowBoardMAX Turbot LSE connector.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Pierre-Louis Bossart 2017-02-20 14:23:56 -06:00 committed by Stephen Boyd
parent 8973aa4aec
commit 41ee7caf59
1 changed files with 7 additions and 0 deletions
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7
drivers/clk/x86/clk-pmc-atom.c
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@ -54,6 +54,7 @@ struct clk_plt_data {
struct clk_plt_fixed **parents;
u8 nparents;
struct clk_plt *clks[PMC_CLK_NUM];
struct clk_lookup *mclk_lookup;
};
/* Return an index in parent table */
@ -337,6 +338,11 @@ static int plt_clk_probe(struct platform_device *pdev)
goto err_unreg_clk_plt;
}
}
data->mclk_lookup = clkdev_hw_create(&data->clks[3]->hw, "mclk", NULL);
if (IS_ERR(data->mclk_lookup)) {
err = PTR_ERR(data->mclk_lookup);
goto err_unreg_clk_plt;
}
plt_clk_free_parent_names_loop(parent_names, data->nparents);
@ -356,6 +362,7 @@ static int plt_clk_remove(struct platform_device *pdev)
data = platform_get_drvdata(pdev);
clkdev_drop(data->mclk_lookup);
plt_clk_unregister_loop(data, PMC_CLK_NUM);
plt_clk_unregister_parents(data);
return 0;