[PATCH v2] mux: mmio: use reg property when parent device is not a syscon

[PATCH v2] mux: mmio: use reg property when parent device is not a syscon

[Andrew Davis]

The DT binding for the reg-mux compatible states it can be used when the
"parent device of mux controller is not syscon device". It also allows
for a reg property. When the reg property is provided, use that to
identify the address space for this mux. If not provided fallback to
using the parent device as a regmap provider.

Signed-off-by: Andrew Davis <afd@ti.com>
---

Changes from v1:
 - Flip logic as suggested in v1[0]

[0] https://lore.kernel.org/lkml/1c27d9d4-b1cc-c158-90f7-f7e47e02c424@ti.com/T/

 drivers/mux/mmio.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
index 44a7a0e885b8d..2c9e4df9d6f2c 100644
--- a/drivers/mux/mmio.c
+++ b/drivers/mux/mmio.c
@@ -44,10 +44,13 @@ static int mux_mmio_probe(struct platform_device *pdev)
 	int ret;
 	int i;
 
-	if (of_device_is_compatible(np, "mmio-mux"))
+	if (of_device_is_compatible(np, "mmio-mux")) {
 		regmap = syscon_node_to_regmap(np->parent);
-	else
-		regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
+	} else {
+		regmap = device_node_to_regmap(np);
+		if (IS_ERR(regmap))
+			regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
+	}
 	if (IS_ERR(regmap)) {
 		ret = PTR_ERR(regmap);
 		dev_err(dev, "failed to get regmap: %d\n", ret);
-- 
2.39.2

Re: [PATCH v2] mux: mmio: use reg property when parent device is not a syscon

[Andrew Davis]

On 6/5/23 10:41 AM, Andrew Davis wrote:
> The DT binding for the reg-mux compatible states it can be used when the
> "parent device of mux controller is not syscon device". It also allows
> for a reg property. When the reg property is provided, use that to
> identify the address space for this mux. If not provided fallback to
> using the parent device as a regmap provider.
> 
> Signed-off-by: Andrew Davis <afd@ti.com>
> ---

Ping, still needed and applies cleanly on v6.5-rc1.

Andrew

> 
> Changes from v1:
>   - Flip logic as suggested in v1[0]
> 
> [0] https://lore.kernel.org/lkml/1c27d9d4-b1cc-c158-90f7-f7e47e02c424@ti.com/T/
> 
>   drivers/mux/mmio.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
> index 44a7a0e885b8d..2c9e4df9d6f2c 100644
> --- a/drivers/mux/mmio.c
> +++ b/drivers/mux/mmio.c
> @@ -44,10 +44,13 @@ static int mux_mmio_probe(struct platform_device *pdev)
>   	int ret;
>   	int i;
>   
> -	if (of_device_is_compatible(np, "mmio-mux"))
> +	if (of_device_is_compatible(np, "mmio-mux")) {
>   		regmap = syscon_node_to_regmap(np->parent);
> -	else
> -		regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
> +	} else {
> +		regmap = device_node_to_regmap(np);
> +		if (IS_ERR(regmap))
> +			regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
> +	}
>   	if (IS_ERR(regmap)) {
>   		ret = PTR_ERR(regmap);
>   		dev_err(dev, "failed to get regmap: %d\n", ret);

Re: [PATCH v2] mux: mmio: use reg property when parent device is not a syscon

[Nishanth Menon]

On 15:12-20230713, Andrew Davis wrote:
> On 6/5/23 10:41 AM, Andrew Davis wrote:
> > The DT binding for the reg-mux compatible states it can be used when the
> > "parent device of mux controller is not syscon device". It also allows
> > for a reg property. When the reg property is provided, use that to
> > identify the address space for this mux. If not provided fallback to
> > using the parent device as a regmap provider.
> > 
> > Signed-off-by: Andrew Davis <afd@ti.com>
> > ---
> 
> Ping, still needed and applies cleanly on v6.5-rc1.
> 
> Andrew
> 
> > 
> > Changes from v1:
> >   - Flip logic as suggested in v1[0]
> > 
> > [0] https://lore.kernel.org/lkml/1c27d9d4-b1cc-c158-90f7-f7e47e02c424@ti.com/T/
> > 
> >   drivers/mux/mmio.c | 9 ++++++---
> >   1 file changed, 6 insertions(+), 3 deletions(-)


Reviewed-by: Nishanth Menon <nm@ti.com>

Greg: looks like you were missed in CC

Peter/Greg: Any chance of Looking at this? This is a basic corner stone
for us to clean up much of the mess we have created up in the device
tree syscon nodes and trying to transition those into simple-bus.

> > 
> > diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
> > index 44a7a0e885b8d..2c9e4df9d6f2c 100644
> > --- a/drivers/mux/mmio.c
> > +++ b/drivers/mux/mmio.c
> > @@ -44,10 +44,13 @@ static int mux_mmio_probe(struct platform_device *pdev)
> >   	int ret;
> >   	int i;
> > -	if (of_device_is_compatible(np, "mmio-mux"))
> > +	if (of_device_is_compatible(np, "mmio-mux")) {
> >   		regmap = syscon_node_to_regmap(np->parent);
> > -	else
> > -		regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
> > +	} else {
> > +		regmap = device_node_to_regmap(np);
> > +		if (IS_ERR(regmap))
> > +			regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
> > +	}
> >   	if (IS_ERR(regmap)) {
> >   		ret = PTR_ERR(regmap);
> >   		dev_err(dev, "failed to get regmap: %d\n", ret);

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

Re: [PATCH v2] mux: mmio: use reg property when parent device is not a syscon

[Greg Kroah-Hartman]

On Mon, Aug 07, 2023 at 01:26:45PM -0500, Nishanth Menon wrote:
> On 15:12-20230713, Andrew Davis wrote:
> > On 6/5/23 10:41 AM, Andrew Davis wrote:
> > > The DT binding for the reg-mux compatible states it can be used when the
> > > "parent device of mux controller is not syscon device". It also allows
> > > for a reg property. When the reg property is provided, use that to
> > > identify the address space for this mux. If not provided fallback to
> > > using the parent device as a regmap provider.
> > > 
> > > Signed-off-by: Andrew Davis <afd@ti.com>
> > > ---
> > 
> > Ping, still needed and applies cleanly on v6.5-rc1.
> > 
> > Andrew
> > 
> > > 
> > > Changes from v1:
> > >   - Flip logic as suggested in v1[0]
> > > 
> > > [0] https://lore.kernel.org/lkml/1c27d9d4-b1cc-c158-90f7-f7e47e02c424@ti.com/T/
> > > 
> > >   drivers/mux/mmio.c | 9 ++++++---
> > >   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> 
> Reviewed-by: Nishanth Menon <nm@ti.com>
> 
> Greg: looks like you were missed in CC
> 
> Peter/Greg: Any chance of Looking at this? This is a basic corner stone
> for us to clean up much of the mess we have created up in the device
> tree syscon nodes and trying to transition those into simple-bus.
> 
> > > 
> > > diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
> > > index 44a7a0e885b8d..2c9e4df9d6f2c 100644
> > > --- a/drivers/mux/mmio.c
> > > +++ b/drivers/mux/mmio.c
> > > @@ -44,10 +44,13 @@ static int mux_mmio_probe(struct platform_device *pdev)
> > >   	int ret;
> > >   	int i;
> > > -	if (of_device_is_compatible(np, "mmio-mux"))
> > > +	if (of_device_is_compatible(np, "mmio-mux")) {
> > >   		regmap = syscon_node_to_regmap(np->parent);
> > > -	else
> > > -		regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
> > > +	} else {
> > > +		regmap = device_node_to_regmap(np);
> > > +		if (IS_ERR(regmap))
> > > +			regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
> > > +	}
> > >   	if (IS_ERR(regmap)) {
> > >   		ret = PTR_ERR(regmap);
> > >   		dev_err(dev, "failed to get regmap: %d\n", ret);

I'm not the maintainer here, it's up to Peter.