linux-kernel - Re: [PATCH v1] clk: keystone: syscon-clk: Fix audio refclk

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Date:   Mon, 31 Jul 2023 16:07:52 +0530
From:   Jai Luthra <j-luthra@...com>
To:     Francesco Dolcini <francesco@...cini.it>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
CC:     Francesco Dolcini <francesco.dolcini@...adex.com>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v1] clk: keystone: syscon-clk: Fix audio refclk

Hi Francesco,

On 29/07/23 03:56, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@...adex.com>
> 
> Audio REFCLK's are not working correctly, trying to use them lead to the
> following errors:
> 
> [    6.575277] of_clk_hw_onecell_get: invalid index 4294934528
> [    6.581515] wm8904 1-001a: Failed to get MCLK
> [    6.586290] wm8904: probe of 1-001a failed with error -2
> 
> The issue is that Audio REFCLK has #clock-cells = 0 [1], while the driver
> is registering those clocks assuming they have one cells. Fix this by
> registering the clock with of_clk_hw_simple_get() when there is only one
> instance, e.g. "audio_refclk".

Good catch, I didn't encounter the dmesg error during my tests - 
probably because of zero-initialized structs so idx = 0.

> 
> [1] Documentation/devicetree/bindings/clock/ti,am62-audio-refclk.yaml
> 
> Fixes: 6acab96ee337 ("clk: keystone: syscon-clk: Add support for audio refclk")
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>

Reviewed-by: Jai Luthra <j-luthra@...com>

> ---
>   drivers/clk/keystone/syscon-clk.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/keystone/syscon-clk.c b/drivers/clk/keystone/syscon-clk.c
> index d33f74119488..6b335ce5cc26 100644
> --- a/drivers/clk/keystone/syscon-clk.c
> +++ b/drivers/clk/keystone/syscon-clk.c
> @@ -151,8 +151,12 @@ static int ti_syscon_gate_clk_probe(struct platform_device *pdev)
>   				 data[i].name);
>   	}
>   
> -	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> -					   hw_data);
> +	if (num_clks == 1)
> +		return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
> +						   hw_data->hws[0]);
> +	else
> +		return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> +						   hw_data);
>   }
>   
>   #define TI_SYSCON_CLK_GATE(_name, _offset, _bit_idx)	\

-- 
Thanks,
Jai

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