From: Michael Turquette <mturquette@baylibre.com>
To: Guodong Xu <guodong.xu@linaro.org>,
sboyd@codeaurora.org, jorge.ramirez-ortiz@linaro.org,
xinliang.liu@linaro.org, guodong.xu@linaro.org,
john.stultz@linaro.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org
Subject: Re: [PATCH v2 2/2] clk: hi6220: initialize UART1 clock to 150MHz
Date: Wed, 06 Jul 2016 14:43:11 -0700 [thread overview]
Message-ID: <146784139106.73491.6417383579004254897@resonance> (raw)
In-Reply-To: <1467189955-21694-2-git-send-email-guodong.xu@linaro.org>
Quoting Guodong Xu (2016-06-29 01:45:55)
> From: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
> =
> Early at boot, during the sys_clk initialization, make sure UART1 uses
> the higher frequency clock, 150MHz.
> =
> This enables support for higher baud rates (up to 3Mbps) in UART1, which
> is required by faster bluetooth transfers.
> =
> v2: use clk_set_rate() to propergate clock settings.
> =
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
> Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
> ---
> drivers/clk/hisilicon/clk-hi6220.c | 4 ++++
> 1 file changed, 4 insertions(+)
> =
> diff --git a/drivers/clk/hisilicon/clk-hi6220.c b/drivers/clk/hisilicon/c=
lk-hi6220.c
> index a36ffcb..631c56f 100644
> --- a/drivers/clk/hisilicon/clk-hi6220.c
> +++ b/drivers/clk/hisilicon/clk-hi6220.c
> @@ -12,6 +12,7 @@
> =
> #include <linux/kernel.h>
> #include <linux/clk-provider.h>
> +#include <linux/clk.h>
> #include <linux/clkdev.h>
> #include <linux/io.h>
> #include <linux/of.h>
> @@ -192,6 +193,9 @@ static void __init hi6220_clk_sys_init(struct device_=
node *np)
> =
> hi6220_clk_register_divider(hi6220_div_clks_sys,
> ARRAY_SIZE(hi6220_div_clks_sys), clk_data);
> +
> + if (clk_set_rate(clk_data->clk_data.clks[HI6220_UART1_SRC], 15000=
0000))
> + pr_err("failed to set uart1 clock rate\n");
Why doesn't the UART driver call clk_get and then clk_set_rate on this
clock? Why do it in the clk provider driver?
Thanks,
Mike
> }
> CLK_OF_DECLARE(hi6220_clk_sys, "hisilicon,hi6220-sysctrl", hi6220_clk_sy=
s_init);
> =
> -- =
> 1.9.1
>=20
next prev parent reply other threads:[~2016-07-06 21:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-29 8:45 [PATCH v2 1/2] clk: hi6220: Change syspll and media_syspll clk to 1.19GHz Guodong Xu
2016-06-29 8:45 ` [PATCH v2 2/2] clk: hi6220: initialize UART1 clock to 150MHz Guodong Xu
2016-07-06 21:43 ` Michael Turquette [this message]
2016-07-07 6:31 ` Jorge Ramirez
2016-07-07 8:55 ` Jorge Ramirez
2016-07-08 1:48 ` Michael Turquette
2016-07-08 6:57 ` Jorge Ramirez
2016-07-06 22:23 ` [PATCH v2 1/2] clk: hi6220: Change syspll and media_syspll clk to 1.19GHz Michael Turquette
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