linux-kernel - Re: [PATCH 9/9] spi: atmel-quadspi: add support for sam9x60 qspi controller

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Message-ID: <ae6235b9-be0c-525d-660e-66fb28577376@microchip.com>
Date:   Thu, 31 Jan 2019 10:46:10 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <bbrezillon@...nel.org>
CC:     <broonie@...nel.org>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-spi@...r.kernel.org>
Subject: Re: [PATCH 9/9] spi: atmel-quadspi: add support for sam9x60 qspi
 controller



On 01/30/2019 07:43 PM, Boris Brezillon wrote:
> On Wed, 30 Jan 2019 15:08:47 +0000
> <Tudor.Ambarus@...rochip.com> wrote:
> 
>> +static int atmel_sam9x60_qspi_clk_prepare_enable(struct atmel_qspi *aq)
>> +{
>> +	struct device *dev = &aq->pdev->dev;
>> +	int ret;
>> +
>> +	if (!aq->clk) {
>> +		/* Get the peripheral clock */
>> +		aq->clk = devm_clk_get(dev, "pclk");
>> +		if (IS_ERR(aq->clk)) {
>> +			dev_err(dev, "missing peripheral clock\n");
>> +			return PTR_ERR(aq->clk);
>> +		}
>> +	}
>> +
>> +	if (!aq->qspick) {
>> +		/* Get the QSPI system clock */
>> +		aq->qspick = devm_clk_get(dev, "qspick");
>> +		if (IS_ERR(aq->qspick)) {
>> +			dev_err(dev, "missing system clock\n");
>> +			return PTR_ERR(aq->qspick);
>> +		}
>> +	}
> 
> Move the devm_clk_get() calls to the probe path instead of doing it at
> prepare time, and you can make it generic for both compats with
> something like:
> 
> 	aq->clk = devm_clk_get(dev, "pclk");
> 	if (IS_ERR(aq->clk))
> 		aq->clk = devm_clk_get(dev, NULL);
> 
> 	if (IS_ERR(aq->clk))
> 		return PTR_ERR(aq->clk);
> 
> 	if (aq->caps->qspick_required) {
> 		aq->qspick = devm_clk_get(dev, "qspick");
> 		if (IS_ERR(aq->qspick)) {
> 			return PTR_ERR(aq->qspick);
> 	}

good tip, will do, thanks!

ta