[PATCHv4 8/9] ASoC: fsl-asoc-card: add DT property "cpu-system-clock-direction-out"
Add new optional DT property "cpu-system-clock-direction-out" to set sysclk direction as "out" for the CPU DAI when using the generic codec. It is set for both Tx and Rx. If not set, the direction is "in". The way the direction value is used is up to the CPU DAI driver implementation.
Signed-off-by: Elinor Montmasson elinor.montmasson@savoirfairelinux.com --- sound/soc/fsl/fsl-asoc-card.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/sound/soc/fsl/fsl-asoc-card.c b/sound/soc/fsl/fsl-asoc-card.c index c7fc9c16f761..f3fc2b29c92f 100644 --- a/sound/soc/fsl/fsl-asoc-card.c +++ b/sound/soc/fsl/fsl-asoc-card.c @@ -760,6 +760,10 @@ static int fsl_asoc_card_probe(struct platform_device *pdev) priv->cpu_priv.sysclk_freq[RX] = priv->cpu_priv.sysclk_freq[TX]; clk_put(cpu_sysclk); } + priv->cpu_priv.sysclk_dir[TX] = + of_property_read_bool(np, "cpu-system-clock-direction-out") ? + SND_SOC_CLOCK_OUT : SND_SOC_CLOCK_IN; + priv->cpu_priv.sysclk_dir[RX] = priv->cpu_priv.sysclk_dir[TX]; } else { dev_err(&pdev->dev, "unknown Device Tree compatible\n"); ret = -EINVAL;
On Wed, May 15, 2024 at 03:54:10PM +0200, Elinor Montmasson wrote:
Add new optional DT property "cpu-system-clock-direction-out" to set sysclk direction as "out" for the CPU DAI when using the generic codec. It is set for both Tx and Rx. If not set, the direction is "in". The way the direction value is used is up to the CPU DAI driver implementation.
This feels like we should be using the clock bindings to specify the clock input of whatever is using the output from the SoC, though that's a lot more work.
From: "Mark Brown" broonie@kernel.org Sent: Thursday, 16 May, 2024 14:18:00
On Wed, May 15, 2024 at 03:54:10PM +0200, Elinor Montmasson wrote:
Add new optional DT property "cpu-system-clock-direction-out" to set sysclk direction as "out" for the CPU DAI when using the generic codec. It is set for both Tx and Rx. If not set, the direction is "in". The way the direction value is used is up to the CPU DAI driver implementation.
This feels like we should be using the clock bindings to specify the clock input of whatever is using the output from the SoC, though that's a lot more work.
Similarly to patch 7/9, I exposed this parameter because the driver has it, and because there might be CPU DAIs needing this parameter. Otherwise the cpu sysclk direction will always be IN as a default. This parameter could be needed for cases with CPU DAIs, such as an SAI, which can provide or consume Tx/Rx clocks. For these devices I know the sysclk direction should correspond to what was set in the dai format.
This new compatible is intended to be used when there is no codec device/driver. There is technically no codec device/driver for which the clock input can be set.
Is it a bad idea to allow setting the cpu sysclk direction only ? Should the compatible be limited to use-cases where the cpu sysclk direction cannot be set by the machine driver ?
Best regards, Elinor Montmasson
On Fri, May 17, 2024 at 05:05:38AM -0400, Elinor Montmasson wrote:
This new compatible is intended to be used when there is no codec device/driver. There is technically no codec device/driver for which the clock input can be set.
This is obviously not true, there clearly is a driver.
Is it a bad idea to allow setting the cpu sysclk direction only ? Should the compatible be limited to use-cases where the cpu sysclk direction cannot be set by the machine driver ?
When I said "this should use the clock bindings" I meant that we should use the clock bindings for configuration here.
From: "Mark Brown" broonie@kernel.org Sent: Friday, 17 May, 2024 13:06:03
On Fri, May 17, 2024 at 05:05:38AM -0400, Elinor Montmasson wrote:
This new compatible is intended to be used when there is no codec device/driver. There is technically no codec device/driver for which the clock input can be set.
This is obviously not true, there clearly is a driver.
Is it a bad idea to allow setting the cpu sysclk direction only ? Should the compatible be limited to use-cases where the cpu sysclk direction cannot be set by the machine driver ?
When I said "this should use the clock bindings" I meant that we should use the clock bindings for configuration here.
As far I as know, it's not possible to set the direction with the clock bindings, but maybe there is and I missed something ?
On Fri, May 31, 2024 at 08:47:22AM -0400, Elinor Montmasson wrote:
When I said "this should use the clock bindings" I meant that we should use the clock bindings for configuration here.
As far I as know, it's not possible to set the direction with the clock bindings, but maybe there is and I missed something ?
If a given clock has an input configured then it can't function as an output and vice versa.
participants (2)
-
Elinor Montmasson -
Mark Brown