On 2/20/17 2:23 PM, Pierre-Louis Bossart wrote:
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
Was there any objection or feedback on this patch? The functionality is needed for a couple of audio drivers from Conexant and Dialog initially written for ARM platforms. Thanks -Pierre
drivers/clk/x86/clk-pmc-atom.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/clk/x86/clk-pmc-atom.c b/drivers/clk/x86/clk-pmc-atom.c index 2b60577..fafc991 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;