* Linux-aspeed Digest, Vol 12, Issue 9
[not found] <mailman.7.1526695202.29810.linux-aspeed@lists.ozlabs.org>
@ 2018-05-21 16:18 ` Jae Hyun Yoo
0 siblings, 0 replies; only message in thread
From: Jae Hyun Yoo @ 2018-05-21 16:18 UTC (permalink / raw)
To: linux-aspeed
Hi Lei,
On 5/18/2018 7:00 PM, linux-aspeed-request at lists.ozlabs.org wrote:
> Date: Fri, 18 May 2018 16:57:02 +0800
> From: Lei YU <mine260309@gmail.com>
> To: Michael Turquette <mturquette@baylibre.com>, Stephen Boyd
> <sboyd@kernel.org>, Joel Stanley <joel@jms.id.au>, Andrew Jeffery
> <andrew@aj.id.au>, Rob Herring <robh+dt@kernel.org>, Mark Rutland
> <mark.rutland@arm.com>, Lei YU <mine260309@gmail.com>,
> linux-clk at vger.kernel.org, linux-arm-kernel at lists.infradead.org,
> linux-aspeed at lists.ozlabs.org, linux-kernel at vger.kernel.org,
> devicetree at vger.kernel.org
> Subject: [PATCH] clk: aspeed: Add 24MHz fixed clock
> Message-ID: <1526633822-17138-1-git-send-email-mine260309@gmail.com>
>
> Add a 24MHz fixed clock.
> This clock will be used for certain devices, e.g. pwm.
>
> Signed-off-by: Lei YU <mine260309@gmail.com>
> ---
> drivers/clk/clk-aspeed.c | 9 ++++++++-
> include/dt-bindings/clock/aspeed-clock.h | 1 +
> 2 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c
> index 5eb50c3..4664088 100644
> --- a/drivers/clk/clk-aspeed.c
> +++ b/drivers/clk/clk-aspeed.c
> @@ -14,7 +14,7 @@
>
> #include <dt-bindings/clock/aspeed-clock.h>
>
> -#define ASPEED_NUM_CLKS 35
> +#define ASPEED_NUM_CLKS 36
>
> #define ASPEED_RESET_CTRL 0x04
> #define ASPEED_CLK_SELECTION 0x08
> @@ -474,6 +474,13 @@ static int aspeed_clk_probe(struct platform_device *pdev)
> return PTR_ERR(hw);
> aspeed_clk_data->hws[ASPEED_CLK_BCLK] = hw;
>
> + /* Fixed 24MHz clock */
> + hw = clk_hw_register_fixed_rate(NULL, "fixed-24m", "clkin",
> + 0, 24000000);
> + if (IS_ERR(hw))
> + return PTR_ERR(hw);
> + aspeed_clk_data->hws[ASPEED_CLK_24M] = hw;
> +
According to the datasheet, CLKIN could be a 25MHz too. How can this
change handle the case?
> /*
> * TODO: There are a number of clocks that not included in this driver
> * as more information is required:
> diff --git a/include/dt-bindings/clock/aspeed-clock.h b/include/dt-bindings/clock/aspeed-clock.h
> index d3558d8..ff29d8e 100644
> --- a/include/dt-bindings/clock/aspeed-clock.h
> +++ b/include/dt-bindings/clock/aspeed-clock.h
> @@ -38,6 +38,7 @@
> #define ASPEED_CLK_MAC 32
> #define ASPEED_CLK_BCLK 33
> #define ASPEED_CLK_MPLL 34
> +#define ASPEED_CLK_24M 35
>
> #define ASPEED_RESET_XDMA 0
> #define ASPEED_RESET_MCTP 1
>
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