linux-kernel - Re: [PATCH 1/2] clk: st: clkgen-fsyn: search reg within node or parent

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Date:   Wed, 15 Dec 2021 11:06:04 +0100
From:   Patrice CHOTARD <patrice.chotard@...s.st.com>
To:     Alain Volmat <avolmat@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Lee Jones <lee.jones@...aro.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] clk: st: clkgen-fsyn: search reg within node or
 parent

Ah one remark, reviewing the patch 2, i saw you added a pr_err() in case of error, 
perhaps you can add one here also.

Patrice

On 12/15/21 11:03 AM, Patrice CHOTARD wrote:
> Hi Alain
> 
> On 12/2/21 8:28 AM, Alain Volmat wrote:
>> In order to avoid having duplicated addresses within the DT,
>> only have one unit-address per clockgen and each driver within
>> the clockgen should look at the parent node (overall clockgen)
>> to figure out the reg property.  Such behavior is already in
>> place in other STi platform clock drivers such as clk-flexgen
>> and clkgen-pll.  Keep backward compatibility by first looking
>> at reg within the node before looking into the parent node.
>>
>> Signed-off-by: Alain Volmat <avolmat@...com>
>> ---
>>  drivers/clk/st/clkgen-fsyn.c | 11 +++++++++--
>>  1 file changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clk/st/clkgen-fsyn.c b/drivers/clk/st/clkgen-fsyn.c
>> index 164285d6be97..0d41164f2c7f 100644
>> --- a/drivers/clk/st/clkgen-fsyn.c
>> +++ b/drivers/clk/st/clkgen-fsyn.c
>> @@ -988,9 +988,16 @@ static void __init st_of_quadfs_setup(struct device_node *np,
>>  	void __iomem *reg;
>>  	spinlock_t *lock;
>>  
>> +	/*
>> +	 * First check for reg property within the node to keep backward
>> +	 * compatibility, then if reg doesn't exist look at the parent node
>> +	 */
>>  	reg = of_iomap(np, 0);
>> -	if (!reg)
>> -		return;
>> +	if (!reg) {
>> +		reg = of_iomap(of_get_parent(np), 0);
>> +		if (!reg)
>> +			return;
>> +	}
>>  
>>  	clk_parent_name = of_clk_get_parent_name(np, 0);
>>  	if (!clk_parent_name)
>>
> Reviewed-by: Patrice Chotard <patrice.chotard@...s.st.com>
> 
> Thanks
> Patrice
>