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

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>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/clk/x86/clk-pmc-atom.c b/drivers/clk/x86/clk-pmc-atom.c
index 2b60577703ef..fafc99120dc2 100644
--- a/drivers/clk/x86/clk-pmc-atom.c
+++ b/drivers/clk/x86/clk-pmc-atom.c
@@ -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;