* [PATCH] drm/omap/dss: Use syscon_regmap_lookup_by_phandle_args
@ 2025-01-12 13:46 Krzysztof Kozlowski
2025-01-14 14:23 ` Tomi Valkeinen
0 siblings, 1 reply; 3+ messages in thread
From: Krzysztof Kozlowski @ 2025-01-12 13:46 UTC (permalink / raw)
To: Tomi Valkeinen, Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, dri-devel,
linux-kernel
Cc: Krzysztof Kozlowski
Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
syscon_regmap_lookup_by_phandle() combined with getting the syscon
argument. Except simpler code this annotates within one line that given
phandle has arguments, so grepping for code would be easier.
There is also no real benefit in printing errors on missing syscon
argument, because this is done just too late: runtime check on
static/build-time data. Dtschema and Devicetree bindings offer the
static/build-time check for this already.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
drivers/gpu/drm/omapdrm/dss/dss.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
index 7b2df3185de4..692df747e2ae 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss.c
@@ -1236,21 +1236,15 @@ static int dss_video_pll_probe(struct dss_device *dss)
if (!np)
return 0;
- if (of_property_read_bool(np, "syscon-pll-ctrl")) {
- dss->syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
- "syscon-pll-ctrl");
+ if (of_property_present(np, "syscon-pll-ctrl")) {
+ dss->syscon_pll_ctrl =
+ syscon_regmap_lookup_by_phandle_args(np, "syscon-pll-ctrl",
+ 1, &dss->syscon_pll_ctrl_offset);
if (IS_ERR(dss->syscon_pll_ctrl)) {
dev_err(&pdev->dev,
"failed to get syscon-pll-ctrl regmap\n");
return PTR_ERR(dss->syscon_pll_ctrl);
}
-
- if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
- &dss->syscon_pll_ctrl_offset)) {
- dev_err(&pdev->dev,
- "failed to get syscon-pll-ctrl offset\n");
- return -EINVAL;
- }
}
pll_regulator = devm_regulator_get(&pdev->dev, "vdda_video");
--
2.43.0
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/omap/dss: Use syscon_regmap_lookup_by_phandle_args
2025-01-12 13:46 [PATCH] drm/omap/dss: Use syscon_regmap_lookup_by_phandle_args Krzysztof Kozlowski
@ 2025-01-14 14:23 ` Tomi Valkeinen
2025-01-14 14:43 ` Krzysztof Kozlowski
0 siblings, 1 reply; 3+ messages in thread
From: Tomi Valkeinen @ 2025-01-14 14:23 UTC (permalink / raw)
To: Krzysztof Kozlowski
Cc: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann,
David Airlie, Simona Vetter, dri-devel, linux-kernel
Hi,
On 12/01/2025 15:46, Krzysztof Kozlowski wrote:
> Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
> syscon_regmap_lookup_by_phandle() combined with getting the syscon
> argument. Except simpler code this annotates within one line that given
> phandle has arguments, so grepping for code would be easier.
>
> There is also no real benefit in printing errors on missing syscon
> argument, because this is done just too late: runtime check on
> static/build-time data. Dtschema and Devicetree bindings offer the
> static/build-time check for this already.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> ---
> drivers/gpu/drm/omapdrm/dss/dss.c | 14 ++++----------
> 1 file changed, 4 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
> index 7b2df3185de4..692df747e2ae 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dss.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dss.c
> @@ -1236,21 +1236,15 @@ static int dss_video_pll_probe(struct dss_device *dss)
> if (!np)
> return 0;
>
> - if (of_property_read_bool(np, "syscon-pll-ctrl")) {
> - dss->syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
> - "syscon-pll-ctrl");
> + if (of_property_present(np, "syscon-pll-ctrl")) {
> + dss->syscon_pll_ctrl =
> + syscon_regmap_lookup_by_phandle_args(np, "syscon-pll-ctrl",
> + 1, &dss->syscon_pll_ctrl_offset);
> if (IS_ERR(dss->syscon_pll_ctrl)) {
> dev_err(&pdev->dev,
> "failed to get syscon-pll-ctrl regmap\n");
> return PTR_ERR(dss->syscon_pll_ctrl);
> }
> -
> - if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
> - &dss->syscon_pll_ctrl_offset)) {
> - dev_err(&pdev->dev,
> - "failed to get syscon-pll-ctrl offset\n");
> - return -EINVAL;
> - }
> }
>
> pll_regulator = devm_regulator_get(&pdev->dev, "vdda_video");
Looks reasonable to me. Tested on dra76 evm.
I can push this to drm-misc-next later if I see no other comments.
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Tomi
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/omap/dss: Use syscon_regmap_lookup_by_phandle_args
2025-01-14 14:23 ` Tomi Valkeinen
@ 2025-01-14 14:43 ` Krzysztof Kozlowski
0 siblings, 0 replies; 3+ messages in thread
From: Krzysztof Kozlowski @ 2025-01-14 14:43 UTC (permalink / raw)
To: Tomi Valkeinen
Cc: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann,
David Airlie, Simona Vetter, dri-devel, linux-kernel
On 14/01/2025 15:23, Tomi Valkeinen wrote:
> Hi,
>
> On 12/01/2025 15:46, Krzysztof Kozlowski wrote:
>> Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
>> syscon_regmap_lookup_by_phandle() combined with getting the syscon
>> argument. Except simpler code this annotates within one line that given
>> phandle has arguments, so grepping for code would be easier.
>>
>> There is also no real benefit in printing errors on missing syscon
>> argument, because this is done just too late: runtime check on
>> static/build-time data. Dtschema and Devicetree bindings offer the
>> static/build-time check for this already.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> ---
>> drivers/gpu/drm/omapdrm/dss/dss.c | 14 ++++----------
>> 1 file changed, 4 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
>> index 7b2df3185de4..692df747e2ae 100644
>> --- a/drivers/gpu/drm/omapdrm/dss/dss.c
>> +++ b/drivers/gpu/drm/omapdrm/dss/dss.c
>> @@ -1236,21 +1236,15 @@ static int dss_video_pll_probe(struct dss_device *dss)
>> if (!np)
>> return 0;
>>
>> - if (of_property_read_bool(np, "syscon-pll-ctrl")) {
>> - dss->syscon_pll_ctrl = syscon_regmap_lookup_by_phandle(np,
>> - "syscon-pll-ctrl");
>> + if (of_property_present(np, "syscon-pll-ctrl")) {
I see now that I combined two changes I wanted to split. This should be
a separate commit.
>> + dss->syscon_pll_ctrl =
>> + syscon_regmap_lookup_by_phandle_args(np, "syscon-pll-ctrl",
>> + 1, &dss->syscon_pll_ctrl_offset);
>> if (IS_ERR(dss->syscon_pll_ctrl)) {
>> dev_err(&pdev->dev,
>> "failed to get syscon-pll-ctrl regmap\n");
>> return PTR_ERR(dss->syscon_pll_ctrl);
>> }
>> -
>> - if (of_property_read_u32_index(np, "syscon-pll-ctrl", 1,
>> - &dss->syscon_pll_ctrl_offset)) {
>> - dev_err(&pdev->dev,
>> - "failed to get syscon-pll-ctrl offset\n");
>> - return -EINVAL;
>> - }
>> }
>>
>> pll_regulator = devm_regulator_get(&pdev->dev, "vdda_video");
>
> Looks reasonable to me. Tested on dra76 evm.
>
> I can push this to drm-misc-next later if I see no other comments.
>
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Let me send a v2 with your tag.
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-01-12 13:46 [PATCH] drm/omap/dss: Use syscon_regmap_lookup_by_phandle_args Krzysztof Kozlowski
2025-01-14 14:23 ` Tomi Valkeinen
2025-01-14 14:43 ` Krzysztof Kozlowski
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