* [PATCH] cpufreq: ti-cpufreq: Only register platform_device when supported
@ 2018-08-23 2:44 Dave Gerlach
2018-08-23 7:50 ` Johan Hovold
0 siblings, 1 reply; 3+ messages in thread
From: Dave Gerlach @ 2018-08-23 2:44 UTC (permalink / raw)
To: Viresh Kumar, Rafael J . Wysocki
Cc: linux-arm-kernel, linux-omap, linux-kernel, linux-pm,
Tony Lindgren, Tero Kristo, Nishanth Menon, Stephen Boyd,
Dave Gerlach, Keerthy J
Currently the ti-cpufreq driver blindly registers a 'ti-cpufreq' to force
the driver to probe on any platforms where the driver is built in.
However, this should only happen on platforms that actually can make use
of the driver. There is already functionality in place to match the
SoC compatible so let's factor this out into a separate call and
make sure we find a match before creating the ti-cpufreq driver device.
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
drivers/cpufreq/ti-cpufreq.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c
index 3f0e2a14895a..541fdcf17b57 100644
--- a/drivers/cpufreq/ti-cpufreq.c
+++ b/drivers/cpufreq/ti-cpufreq.c
@@ -201,19 +201,31 @@ static const struct of_device_id ti_cpufreq_of_match[] = {
{},
};
+static const struct of_device_id *ti_cpufreq_match_node(void)
+{
+ struct device_node *np;
+ const struct of_device_id *match;
+
+ np = of_find_node_by_path("/");
+ match = of_match_node(ti_cpufreq_of_match, np);
+ of_node_put(np);
+
+ if (!match)
+ return NULL;
+ else
+ return match;
+}
+
static int ti_cpufreq_probe(struct platform_device *pdev)
{
u32 version[VERSION_COUNT];
- struct device_node *np;
const struct of_device_id *match;
struct opp_table *ti_opp_table;
struct ti_cpufreq_data *opp_data;
const char * const reg_names[] = {"vdd", "vbb"};
int ret;
- np = of_find_node_by_path("/");
- match = of_match_node(ti_cpufreq_of_match, np);
- of_node_put(np);
+ match = ti_cpufreq_match_node();
if (!match)
return -ENODEV;
@@ -290,7 +302,10 @@ static int ti_cpufreq_probe(struct platform_device *pdev)
static int ti_cpufreq_init(void)
{
- platform_device_register_simple("ti-cpufreq", -1, NULL, 0);
+ /* Check to ensure we are on a compatible platform */
+ if (ti_cpufreq_match_node())
+ platform_device_register_simple("ti-cpufreq", -1, NULL, 0);
+
return 0;
}
module_init(ti_cpufreq_init);
--
2.16.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] cpufreq: ti-cpufreq: Only register platform_device when supported
2018-08-23 2:44 [PATCH] cpufreq: ti-cpufreq: Only register platform_device when supported Dave Gerlach
@ 2018-08-23 7:50 ` Johan Hovold
2018-08-23 16:24 ` Dave Gerlach
0 siblings, 1 reply; 3+ messages in thread
From: Johan Hovold @ 2018-08-23 7:50 UTC (permalink / raw)
To: Dave Gerlach
Cc: Viresh Kumar, Rafael J . Wysocki, Nishanth Menon, linux-pm,
Tony Lindgren, Keerthy J, linux-kernel, Tero Kristo,
Stephen Boyd, linux-omap, linux-arm-kernel
On Wed, Aug 22, 2018 at 09:44:32PM -0500, Dave Gerlach wrote:
> Currently the ti-cpufreq driver blindly registers a 'ti-cpufreq' to force
> the driver to probe on any platforms where the driver is built in.
> However, this should only happen on platforms that actually can make use
> of the driver. There is already functionality in place to match the
> SoC compatible so let's factor this out into a separate call and
> make sure we find a match before creating the ti-cpufreq driver device.
>
> Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
> ---
> drivers/cpufreq/ti-cpufreq.c | 25 ++++++++++++++++++++-----
> 1 file changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c
> index 3f0e2a14895a..541fdcf17b57 100644
> --- a/drivers/cpufreq/ti-cpufreq.c
> +++ b/drivers/cpufreq/ti-cpufreq.c
> @@ -201,19 +201,31 @@ static const struct of_device_id ti_cpufreq_of_match[] = {
> {},
> };
>
> +static const struct of_device_id *ti_cpufreq_match_node(void)
> +{
> + struct device_node *np;
> + const struct of_device_id *match;
> +
> + np = of_find_node_by_path("/");
> + match = of_match_node(ti_cpufreq_of_match, np);
> + of_node_put(np);
> +
> + if (!match)
> + return NULL;
> + else
> + return match;
Shouldn't this just be "return match"?
> +}
> +
> static int ti_cpufreq_probe(struct platform_device *pdev)
> {
> u32 version[VERSION_COUNT];
> - struct device_node *np;
> const struct of_device_id *match;
> struct opp_table *ti_opp_table;
> struct ti_cpufreq_data *opp_data;
> const char * const reg_names[] = {"vdd", "vbb"};
> int ret;
>
> - np = of_find_node_by_path("/");
> - match = of_match_node(ti_cpufreq_of_match, np);
> - of_node_put(np);
> + match = ti_cpufreq_match_node();
> if (!match)
> return -ENODEV;
>
> @@ -290,7 +302,10 @@ static int ti_cpufreq_probe(struct platform_device *pdev)
>
> static int ti_cpufreq_init(void)
> {
> - platform_device_register_simple("ti-cpufreq", -1, NULL, 0);
> + /* Check to ensure we are on a compatible platform */
> + if (ti_cpufreq_match_node())
> + platform_device_register_simple("ti-cpufreq", -1, NULL, 0);
> +
> return 0;
> }
> module_init(ti_cpufreq_init);
With that fixed, feel free to add:
Reviewed-by: Johan Hovold <johan@kernel.org>
Johan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] cpufreq: ti-cpufreq: Only register platform_device when supported
2018-08-23 7:50 ` Johan Hovold
@ 2018-08-23 16:24 ` Dave Gerlach
0 siblings, 0 replies; 3+ messages in thread
From: Dave Gerlach @ 2018-08-23 16:24 UTC (permalink / raw)
To: Johan Hovold
Cc: Viresh Kumar, Rafael J . Wysocki, Nishanth Menon, linux-pm,
Tony Lindgren, Keerthy J, linux-kernel, Tero Kristo,
Stephen Boyd, linux-omap, linux-arm-kernel
On 08/23/2018 02:50 AM, Johan Hovold wrote:
> On Wed, Aug 22, 2018 at 09:44:32PM -0500, Dave Gerlach wrote:
>> Currently the ti-cpufreq driver blindly registers a 'ti-cpufreq' to force
>> the driver to probe on any platforms where the driver is built in.
>> However, this should only happen on platforms that actually can make use
>> of the driver. There is already functionality in place to match the
>> SoC compatible so let's factor this out into a separate call and
>> make sure we find a match before creating the ti-cpufreq driver device.
>>
>> Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
>> ---
>> drivers/cpufreq/ti-cpufreq.c | 25 ++++++++++++++++++++-----
>> 1 file changed, 20 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c
>> index 3f0e2a14895a..541fdcf17b57 100644
>> --- a/drivers/cpufreq/ti-cpufreq.c
>> +++ b/drivers/cpufreq/ti-cpufreq.c
>> @@ -201,19 +201,31 @@ static const struct of_device_id ti_cpufreq_of_match[] = {
>> {},
>> };
>>
>> +static const struct of_device_id *ti_cpufreq_match_node(void)
>> +{
>> + struct device_node *np;
>> + const struct of_device_id *match;
>> +
>> + np = of_find_node_by_path("/");
>> + match = of_match_node(ti_cpufreq_of_match, np);
>> + of_node_put(np);
>> +
>> + if (!match)
>> + return NULL;
>> + else
>> + return match;
>
> Shouldn't this just be "return match"?
Whoops, yes that's an entirely pointless check I added.
>
>> +}
>> +
>> static int ti_cpufreq_probe(struct platform_device *pdev)
>> {
>> u32 version[VERSION_COUNT];
>> - struct device_node *np;
>> const struct of_device_id *match;
>> struct opp_table *ti_opp_table;
>> struct ti_cpufreq_data *opp_data;
>> const char * const reg_names[] = {"vdd", "vbb"};
>> int ret;
>>
>> - np = of_find_node_by_path("/");
>> - match = of_match_node(ti_cpufreq_of_match, np);
>> - of_node_put(np);
>> + match = ti_cpufreq_match_node();
>> if (!match)
>> return -ENODEV;
>>
>> @@ -290,7 +302,10 @@ static int ti_cpufreq_probe(struct platform_device *pdev)
>>
>> static int ti_cpufreq_init(void)
>> {
>> - platform_device_register_simple("ti-cpufreq", -1, NULL, 0);
>> + /* Check to ensure we are on a compatible platform */
>> + if (ti_cpufreq_match_node())
>> + platform_device_register_simple("ti-cpufreq", -1, NULL, 0);
>> +
>> return 0;
>> }
>> module_init(ti_cpufreq_init);
>
> With that fixed, feel free to add:
>
> Reviewed-by: Johan Hovold <johan@kernel.org>
Thanks for the review I will update and resend.
Regards,
Dave
>
> Johan
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-08-23 2:44 [PATCH] cpufreq: ti-cpufreq: Only register platform_device when supported Dave Gerlach
2018-08-23 7:50 ` Johan Hovold
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