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SubjectRe: [PATCH 2/2] soc: ti: pruss: add support for AM18XX/OMAP-L138 PRUSS
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On 1/15/21 6:52 PM, Suman Anna wrote:
> Hi David,
>
> On 1/4/21 12:30 PM, David Lechner wrote:
>> This adds support for the PRUSS found in AM18XX/OMAP-L138. This PRUSS
>> doesn't have a CFG register, so that is made optional as selected by
>> the device tree compatible string.
>>
>> ARCH_DAVINCI is added in the Kconfig so that the driver can be selected
>> on that platform.
>>
>> Signed-off-by: David Lechner <david@lechnology.com>
>> ---
>> drivers/soc/ti/Kconfig | 2 +-
>> drivers/soc/ti/pruss.c | 76 ++++++++++++++++++++++++------------------
>> 2 files changed, 45 insertions(+), 33 deletions(-)
>>
>> diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig
>> index 7e2fb1c16af1..7a692a21480a 100644
>> --- a/drivers/soc/ti/Kconfig
>> +++ b/drivers/soc/ti/Kconfig
>> @@ -85,7 +85,7 @@ config TI_K3_SOCINFO
>>
>> config TI_PRUSS
>> tristate "TI PRU-ICSS Subsystem Platform drivers"
>> - depends on SOC_AM33XX || SOC_AM43XX || SOC_DRA7XX || ARCH_KEYSTONE || ARCH_K3
>> + depends on ARCH_DAVINCI || SOC_AM33XX || SOC_AM43XX || SOC_DRA7XX || ARCH_KEYSTONE || ARCH_K3
>> select MFD_SYSCON
>> help
>> TI PRU-ICSS Subsystem platform specific support.
>> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
>> index 5d6e7132a5c4..bfaf3ff74b01 100644
>> --- a/drivers/soc/ti/pruss.c
>> +++ b/drivers/soc/ti/pruss.c
>> @@ -24,10 +24,12 @@
>> * struct pruss_private_data - PRUSS driver private data
>> * @has_no_sharedram: flag to indicate the absence of PRUSS Shared Data RAM
>> * @has_core_mux_clock: flag to indicate the presence of PRUSS core clock
>> + * @has_cfg: flag to indicate the presence of PRUSS CFG registers
>
> I recommend to change this to a negative flag as the Davinci platforms are the
> only ones that don't have CFG (being the very first SoCs with a PRUSS IP)
> sub-module.

Negative flags hurt my brain. :-)

I was actually thinking about submitting a patch to convert
has_no_sharedram to a positive flag as well. But I understand
the sentiment of only setting the flag true for the odd case
rather than the usual case.

>
>> */
>> struct pruss_private_data {
>> bool has_no_sharedram;
>> bool has_core_mux_clock;
>> + bool has_cfg;
>> };
>>
>> static void pruss_of_free_clk_provider(void *data)
>> @@ -239,42 +241,44 @@ static int pruss_probe(struct platform_device *pdev)
>> goto rpm_disable;
>> }
>>
>
> And use it here to skip all the cfg code parsing. All the below delta is just
> for the additional indentation for the flag. If you don't like goto's in
> non-error paths, then we can refactor the CFG parse code into a separate function.
>

Refactoring to a separate function sounds good to me.

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