linux-kernel - Re: [PATCH v2 5/6] clk: stm32f469: Add QSPI clock

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Message-ID: <ce7829db-a858-2de9-f9e5-89c6642262b1@st.com>
Date:   Thu, 20 Oct 2016 17:44:44 +0200
From:   Gabriel Fernandez <gabriel.fernandez@...com>
To:     Stephen Boyd <sboyd@...eaurora.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Nicolas Pitre <nico@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        <daniel.thompson@...aro.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <ludovic.barre@...com>, <olivier.bideau@...com>,
        <amelie.delaunay@...com>
Subject: Re: [PATCH v2 5/6] clk: stm32f469: Add QSPI clock

Hi Stephen


On 10/19/2016 10:32 PM, Stephen Boyd wrote:
> On 10/14, gabriel.fernandez@...com wrote:
>> @@ -532,10 +618,42 @@ static struct clk_hw *stm32_register_cclk(struct device *dev, const char *name,
>>   	{ 0 },
>>   };
>>   
>> +struct stm32f4_clk_data {
>> +	const struct stm32f4_gate_data *gates_data;
>> +	const u64 *gates_map;
>> +	int gates_num;
>> +};
>> @@ -549,6 +667,19 @@ static void __init stm32f4_rcc_init(struct device_node *np)
>>   		goto fail;
>>   	}
>>   
>> +	match = of_match_node(stm32f4_of_match, np);
>> +	if (WARN_ON(!match))
>> +		return;
>> +
>> +	data = match->data;
>> +
>> +	clks = kmalloc_array(data->gates_num + END_PRIMARY_CLK,
>> +			sizeof(struct clk_hw *), GFP_KERNEL);
> sizeof(*clks)?
ok

>
>> +	if (!clks)
>> +		goto fail;
>> +
>> +	stm32f4_gate_map = data->gates_map;
>> +
>>   	hse_clk = of_clk_get_parent_name(np, 0);
>>   
>>   	clk_register_fixed_rate_with_accuracy(NULL, "hsi", NULL, 0,
>> @@ -581,11 +712,15 @@ static void __init stm32f4_rcc_init(struct device_node *np)
>>   	clks[FCLK] = clk_hw_register_fixed_factor(NULL, "fclk", "ahb_div",
>>   					       0, 1, 1);
>>   
>> -	for (n = 0; n < ARRAY_SIZE(stm32f4_gates); n++) {
>> -		const struct stm32f4_gate_data *gd = &stm32f4_gates[n];
>> -		unsigned int secondary =
>> -		    8 * (gd->offset - STM32F4_RCC_AHB1ENR) + gd->bit_idx;
>> -		int idx = stm32f4_rcc_lookup_clk_idx(0, secondary);
>> +	for (n = 0; n < data->gates_num; n++) {
>> +		const struct stm32f4_gate_data *gd;
>> +		unsigned int secondary;
>> +		int idx;
>> +
>> +		gd = (struct stm32f4_gate_data *) &data->gates_data[n];
> Why do we cast here? Get rid of const? Perhaps the struct
> shouldn't have const on the member instead?
we don't need cast here.

Thank's Stephen

BR
Gabriel
>
>> +		secondary = 8 * (gd->offset - STM32F4_RCC_AHB1ENR) +
>> +			gd->bit_idx;
>> +		idx = stm32f4_rcc_lookup_clk_idx(0, secondary);
>>   
>>   		if (idx < 0)