Re: [alsa-devel] [PATCH 1/2] ASoC: rt5682: Add CCF usage for providing I2S clks

On Fri, Feb 14, 2020 at 03:53:33PM +0800, derek.fang@realtek.com wrote:

• parent_clk = clk_get_parent(hw->clk);
• if (!parent_clk)

• dev_warn(component->dev,
  

• 	"Parent mclk of wclk not acquired in driver. Please ensure mclk was provided as %d Hz.\n",
  

• 	CLK_PLL2_FIN);
  

• if (parent_rate != CLK_PLL2_FIN)

• dev_warn(component->dev, "clk %s only support %d Hz input\n",
  

• 	clk_name, CLK_PLL2_FIN);
  

• if (rate != CLK_48) {

• dev_warn(component->dev, "clk %s only support %d Hz output\n",
  

• 	clk_name, CLK_48);
  

• rate = CLK_48;
  

• }

Are these genuine restrictions of the hardware or is this just being hard coded in the driver?