Currently driver provides geni_se_resources_off() function to turn
off SE resources like clocks, pinctrl. But we don't have function to
control clock separately, hence export function geni_se_clks_off()
to turn off clocks separately without disturbing GPIO.

The client drivers like i2c requires this function for use case where
i2c SE is shared between two subsystems.

Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>
---
 drivers/soc/qcom/qcom-geni-se.c  | 4 +++-
 include/linux/soc/qcom/geni-se.h | 3 +++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index 2e8f24d5da80..20166c8fc919 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+// Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
 
 /* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */
 #define __DISABLE_TRACE_MMIO__
@@ -482,13 +483,14 @@ void geni_se_config_packing(struct geni_se *se, int bpw, int pack_words,
 }
 EXPORT_SYMBOL_GPL(geni_se_config_packing);
 
-static void geni_se_clks_off(struct geni_se *se)
+void geni_se_clks_off(struct geni_se *se)
 {
 	struct geni_wrapper *wrapper = se->wrapper;
 
 	clk_disable_unprepare(se->clk);
 	clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->clks);
 }
+EXPORT_SYMBOL_GPL(geni_se_clks_off);
 
 /**
  * geni_se_resources_off() - Turn off resources associated with the serial
diff --git a/include/linux/soc/qcom/geni-se.h b/include/linux/soc/qcom/geni-se.h
index 0f038a1a0330..caf2c0c4505b 100644
--- a/include/linux/soc/qcom/geni-se.h
+++ b/include/linux/soc/qcom/geni-se.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #ifndef _LINUX_QCOM_GENI_SE
@@ -494,6 +495,8 @@ int geni_se_resources_off(struct geni_se *se);
 
 int geni_se_resources_on(struct geni_se *se);
 
+void geni_se_clks_off(struct geni_se *se);
+
 int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl);
 
 int geni_se_clk_freq_match(struct geni_se *se, unsigned long req_freq,
-- 
2.25.1

On 29/08/2024 10:24, Mukesh Kumar Savaliya wrote:
> Currently driver provides geni_se_resources_off() function to turn
> off SE resources like clocks, pinctrl. But we don't have function to
> control clock separately, hence export function geni_se_clks_off()
> to turn off clocks separately without disturbing GPIO.
> 
> The client drivers like i2c requires this function for use case where
> i2c SE is shared between two subsystems.
> 
> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com>

Suggest:

Currently the driver provides a function called 
geni_serial_resources_off() to turn off resources like clocks and 
pinctrl. We don't have a function to control clocks separately hence, 
export the function geni_se_clks_off() to turn off clocks separately 
without disturbing GPIO.

Client drivers like I2C require this function for use-cases where the 
I2C SE is shared between two subsystems.

> ---
>   drivers/soc/qcom/qcom-geni-se.c  | 4 +++-
>   include/linux/soc/qcom/geni-se.h | 3 +++
>   2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
> index 2e8f24d5da80..20166c8fc919 100644
> --- a/drivers/soc/qcom/qcom-geni-se.c
> +++ b/drivers/soc/qcom/qcom-geni-se.c
> @@ -1,5 +1,6 @@
>   // SPDX-License-Identifier: GPL-2.0
>   // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> +// Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
>   
>   /* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */
>   #define __DISABLE_TRACE_MMIO__
> @@ -482,13 +483,14 @@ void geni_se_config_packing(struct geni_se *se, int bpw, int pack_words,
>   }
>   EXPORT_SYMBOL_GPL(geni_se_config_packing);
>   
> -static void geni_se_clks_off(struct geni_se *se)
> +void geni_se_clks_off(struct geni_se *se)
>   {
>   	struct geni_wrapper *wrapper = se->wrapper;
>   
>   	clk_disable_unprepare(se->clk);
>   	clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->clks);
>   }
> +EXPORT_SYMBOL_GPL(geni_se_clks_off);
>

Does it make sense to have geni_se_clks_off() exported without having 
geni_se_clks_on() similarly exported ?

Two exported functions already appear to wrapper this functionality for you.

geni_se_resources_off -> gensi_se_clks_off
geni_se_resources_on -> gensi_se_clks_on

Seems like a usage violation to have geni_se_resources_on() switch the 
clocks on but then have something else directly call gensi_se_clks_off() 
without going through geni_se_resources_off();

?

---
bod

On 8/29/2024 3:49 PM, Bryan O'Donoghue wrote:
> Suggest:
> 
> Currently the driver provides a function called 
> geni_serial_resources_off() to turn off resources like clocks and 
> pinctrl. We don't have a function to control clocks separately hence, 
> export the function geni_se_clks_off() to turn off clocks separately 
> without disturbing GPIO.
> 
> Client drivers like I2C require this function for use-cases where the 
> I2C SE is shared between two subsystems.
ACKed.