Re: [PATCH v3 11/13] spi: atmel-quadspi: add support for named peripheral clock

Boris Brezillon
2019-02-02T07:16:57Z

On Sat, 2 Feb 2019 04:07:41 +0000
<Tudor.Ambarus@microchip.com> wrote:

> From: Tudor Ambarus <tudor.ambarus@microchip.com>
>
> Naming clocks is a good practice. Keep supporting unnamed
> peripheral clock, to be backward compatible with old DTs.
> While here, rename clk to pclk, to indicate that it is a
> peripheral clock.
>
> Suggested-by: Boris Brezillon <bbrezillon@kernel.org>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

Reviewed-by: Boris Brezillon <bbrezillon@kernel.org>

> ---
> v3: new patch
>
> drivers/spi/atmel-quadspi.c | 33 ++++++++++++++++++---------------
> 1 file changed, 18 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
> index bfa5f5e92d96..c9548942535a 100644
> --- a/drivers/spi/atmel-quadspi.c
> +++ b/drivers/spi/atmel-quadspi.c
> @@ -136,7 +136,7 @@
> struct atmel_qspi {
> void __iomem *regs;
> void __iomem *mem;
> - struct clk *clk;
> + struct clk *pclk;
> struct platform_device *pdev;
> u32 pending;
> u32 smm;
> @@ -338,7 +338,7 @@ static int atmel_qspi_setup(struct spi_device *spi)
> if (!spi->max_speed_hz)
> return -EINVAL;
>
> - src_rate = clk_get_rate(aq->clk);
> + src_rate = clk_get_rate(aq->pclk);
> if (!src_rate)
> return -EINVAL;
>
> @@ -429,15 +429,18 @@ static int atmel_qspi_probe(struct platform_device *pdev)
> }
>
> /* Get the peripheral clock */
> - aq->clk = devm_clk_get(&pdev->dev, NULL);
> - if (IS_ERR(aq->clk)) {
> + aq->pclk = devm_clk_get(&pdev->dev, "pclk");
> + if (IS_ERR(aq->pclk))
> + aq->pclk = devm_clk_get(&pdev->dev, NULL);
> +
> + if (IS_ERR(aq->pclk)) {
> dev_err(&pdev->dev, "missing peripheral clock\n");
> - err = PTR_ERR(aq->clk);
> + err = PTR_ERR(aq->pclk);
> goto exit;
> }
>
> /* Enable the peripheral clock */
> - err = clk_prepare_enable(aq->clk);
> + err = clk_prepare_enable(aq->pclk);
> if (err) {
> dev_err(&pdev->dev, "failed to enable the peripheral clock\n");
> goto exit;
> @@ -448,25 +451,25 @@ static int atmel_qspi_probe(struct platform_device *pdev)
> if (irq < 0) {
> dev_err(&pdev->dev, "missing IRQ\n");
> err = irq;
> - goto disable_clk;
> + goto disable_pclk;
> }
> err = devm_request_irq(&pdev->dev, irq, atmel_qspi_interrupt,
> 0, dev_name(&pdev->dev), aq);
> if (err)
> - goto disable_clk;
> + goto disable_pclk;
>
> err = atmel_qspi_init(aq);
> if (err)
> - goto disable_clk;
> + goto disable_pclk;
>
> err = spi_register_controller(ctrl);
> if (err)
> - goto disable_clk;
> + goto disable_pclk;
>
> return 0;
>
> -disable_clk:
> - clk_disable_unprepare(aq->clk);
> +disable_pclk:
> + clk_disable_unprepare(aq->pclk);
> exit:
> spi_controller_put(ctrl);
>
> @@ -480,7 +483,7 @@ static int atmel_qspi_remove(struct platform_device *pdev)
>
> spi_unregister_controller(ctrl);
> writel_relaxed(QSPI_CR_QSPIDIS, aq->regs + QSPI_CR);
> - clk_disable_unprepare(aq->clk);
> + clk_disable_unprepare(aq->pclk);
> return 0;
> }
>
> @@ -488,7 +491,7 @@ static int __maybe_unused atmel_qspi_suspend(struct device *dev)
> {
> struct atmel_qspi *aq = dev_get_drvdata(dev);
>
> - clk_disable_unprepare(aq->clk);
> + clk_disable_unprepare(aq->pclk);
>
> return 0;
> }
> @@ -497,7 +500,7 @@ static int __maybe_unused atmel_qspi_resume(struct device *dev)
> {
> struct atmel_qspi *aq = dev_get_drvdata(dev);
>
> - clk_prepare_enable(aq->clk);
> + clk_prepare_enable(aq->pclk);
>
> return atmel_qspi_init(aq);
> }