linux-kernel - Re: [PATCH v3 20/25] clk: bcm: rpi: Add an enum for the firmware clocks

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Date:   Fri, 05 Jun 2020 14:04:51 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v3 20/25] clk: bcm: rpi: Add an enum for the firmware
 clocks

On Wed, 2020-05-27 at 17:45 +0200, Maxime Ripard wrote:
> While the firmware allows us to discover the available clocks, we need to
> discriminate those clocks to only register the ones meaningful to Linux.
> The firmware also doesn't provide a clock name, so having a list of the ID
> will help us to give clocks a proper name later on.
> 
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
>  drivers/clk/bcm/clk-raspberrypi.c | 23 +++++++++++++++++++----
>  1 file changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-
> raspberrypi.c
> index 5f4e2d49432f..eebd16040f8a 100644
> --- a/drivers/clk/bcm/clk-raspberrypi.c
> +++ b/drivers/clk/bcm/clk-raspberrypi.c
> @@ -18,7 +18,23 @@
>  
>  #include <soc/bcm2835/raspberrypi-firmware.h>
>  
> -#define RPI_FIRMWARE_ARM_CLK_ID		0x00000003
> +enum rpi_firmware_clk_id {
> +	RPI_FIRMWARE_EMMC_CLK_ID = 1,
> +	RPI_FIRMWARE_UART_CLK_ID,
> +	RPI_FIRMWARE_ARM_CLK_ID,
> +	RPI_FIRMWARE_CORE_CLK_ID,
> +	RPI_FIRMWARE_V3D_CLK_ID,
> +	RPI_FIRMWARE_H264_CLK_ID,
> +	RPI_FIRMWARE_ISP_CLK_ID,
> +	RPI_FIRMWARE_SDRAM_CLK_ID,
> +	RPI_FIRMWARE_PIXEL_CLK_ID,
> +	RPI_FIRMWARE_PWM_CLK_ID,
> +	RPI_FIRMWARE_HEVC_CLK_ID,
> +	RPI_FIRMWARE_EMMC2_CLK_ID,
> +	RPI_FIRMWARE_M2MC_CLK_ID,
> +	RPI_FIRMWARE_PIXEL_BVB_CLK_ID,
> +	RPI_FIRMWARE_NUM_CLK_ID,
> +};
>  
>  #define RPI_FIRMWARE_STATE_ENABLE_BIT	BIT(0)
>  #define RPI_FIRMWARE_STATE_WAIT_BIT	BIT(1)
> @@ -31,8 +47,6 @@
>  
>  #define A2W_PLL_FRAC_BITS		20
>  
> -#define NUM_FW_CLKS			16
> -
>  struct raspberrypi_clk {
>  	struct device *dev;
>  	struct rpi_firmware *firmware;
> @@ -320,7 +334,8 @@ static int raspberrypi_clk_probe(struct platform_device
> *pdev)
>  	rpi->firmware = firmware;
>  	platform_set_drvdata(pdev, rpi);
>  
> -	clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, NUM_FW_CLKS),
> +	clk_data = devm_kzalloc(dev, struct_size(clk_data, hws,
> +						 RPI_FIRMWARE_NUM_CLK_ID),

nit: you're allocating one structure too many right?

Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

Regards,
Nicolas


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