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Date: Wed, 29 Mar 2017 11:47:27 +0200 From: Helmut Klein <hgkr.klein@...il.com> To: Jerome Brunet <jbrunet@...libre.com>, gregkh@...uxfoundation.org, carlo@...one.org, khilman@...libre.com Cc: linux-amlogic@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2, 3/3] tty/serial: meson_uart: add the core clock handling to the driver On 28.03.2017 21:16, Jerome Brunet wrote: > On Tue, 2017-03-28 at 11:25 +0200, Helmut Klein wrote: >> This patch gets the core clock as provided by the DT and enables it. >> The code was taken from Amlogic's serial driver, and was tested on my >> board. >> >> Signed-off-by: Helmut Klein <hgkr.klein@...il.com> >> --- >> drivers/tty/serial/meson_uart.c | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c >> index 60f16795d16b..cb99112288eb 100644 >> --- a/drivers/tty/serial/meson_uart.c >> +++ b/drivers/tty/serial/meson_uart.c >> @@ -600,6 +600,7 @@ static int meson_uart_probe(struct platform_device *pdev) >> struct resource *res_mem, *res_irq; >> struct uart_port *port; >> struct clk *clk; >> + struct clk *core_clk; >> int ret = 0; >> >> if (pdev->dev.of_node) >> @@ -625,6 +626,15 @@ static int meson_uart_probe(struct platform_device *pdev) >> if (!port) >> return -ENOMEM; >> >> + core_clk = devm_clk_get(&pdev->dev, "core"); >> + if (!IS_ERR(core_clk)) { >> + ret = clk_prepare_enable(core_clk); >> + if (ret) { >> + dev_err(&pdev->dev, "couldn't enable clkc\n"); >> + return ret; >> + } >> + } >> + >> clk = clk_get(&pdev->dev, NULL); > Now that you have 2 clocks, shouldn't this be named as well ? > if i change the call to "clk = clk_get(&pdev->dev, "xtal");", then IMHO i must add the "clock-names" parameter (clock-names = "xtal") to the sections of the 2 AO-UARTs (uart_AO & uart_AO_B). Is this ok? (or is my assumption wrong?) I'm going to add a patch meson-gx.dtsi anyway, so 2 lines more to add, isn't a big deal. Helmut >> if (IS_ERR(clk)) >> return PTR_ERR(clk); >> -- >> 2.11.0 >> >> >> _______________________________________________ >> linux-amlogic mailing list >> linux-amlogic@...ts.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-amlogic >
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