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Date: Fri, 18 Nov 2022 10:06:26 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...ainline.org>,
Andy Gross <agross@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v2 3/6] soc: qcom: geni-se: add desc struct to specify
clocks from device match data
On 18/11/2022 09:45, Neil Armstrong wrote:
> The I2C Master Hub is a stripped down version of the GENI Serial Engine
> QUP Wrapper Controller but only supporting I2C serial engines without
> DMA support.
>
> Prepare support for the I2C Master Hub variant by moving the required
> clocks list to a new desc struct then passing it through the compatible
> match data.
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> drivers/soc/qcom/qcom-geni-se.c | 59 +++++++++++++++++++++++++++++++----------
> 1 file changed, 45 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
> index a0ceeede450f..ced2a2932eda 100644
> --- a/drivers/soc/qcom/qcom-geni-se.c
> +++ b/drivers/soc/qcom/qcom-geni-se.c
> @@ -81,19 +81,31 @@
> */
>
> #define MAX_CLK_PERF_LEVEL 32
> -#define NUM_AHB_CLKS 2
> +#define MAX_CLKS 2
>
> /**
> * struct geni_wrapper - Data structure to represent the QUP Wrapper Core
> * @dev: Device pointer of the QUP wrapper core
> * @base: Base address of this instance of QUP wrapper core
> - * @ahb_clks: Handle to the primary & secondary AHB clocks
> + * @clks: Handle to the primary & optional secondary AHB clocks
> + * @num_clks: Count of clocks
> * @to_core: Core ICC path
> */
> struct geni_wrapper {
> struct device *dev;
> void __iomem *base;
> - struct clk_bulk_data ahb_clks[NUM_AHB_CLKS];
> + struct clk_bulk_data clks[MAX_CLKS];
> + unsigned int num_clks;
> +};
> +
> +/**
> + * struct geni_se_desc - Data structure to represent the QUP Wrapper resources
> + * @clks: Name of the primary & optional secondary AHB clocks
> + * @num_clks: Count of clock names
> + */
> +struct geni_se_desc {
> + unsigned int num_clks;
> + const char * const *clks;
> };
>
> static const char * const icc_path_names[] = {"qup-core", "qup-config",
> @@ -496,8 +508,7 @@ static void geni_se_clks_off(struct geni_se *se)
> struct geni_wrapper *wrapper = se->wrapper;
>
> clk_disable_unprepare(se->clk);
> - clk_bulk_disable_unprepare(ARRAY_SIZE(wrapper->ahb_clks),
> - wrapper->ahb_clks);
> + clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->clks);
> }
>
> /**
> @@ -528,15 +539,13 @@ static int geni_se_clks_on(struct geni_se *se)
> int ret;
> struct geni_wrapper *wrapper = se->wrapper;
>
> - ret = clk_bulk_prepare_enable(ARRAY_SIZE(wrapper->ahb_clks),
> - wrapper->ahb_clks);
> + ret = clk_bulk_prepare_enable(wrapper->num_clks, wrapper->clks);
> if (ret)
> return ret;
>
> ret = clk_prepare_enable(se->clk);
> if (ret)
> - clk_bulk_disable_unprepare(ARRAY_SIZE(wrapper->ahb_clks),
> - wrapper->ahb_clks);
> + clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->clks);
> return ret;
> }
>
> @@ -887,11 +896,23 @@ static int geni_se_probe(struct platform_device *pdev)
> return PTR_ERR(wrapper->base);
>
> if (!has_acpi_companion(&pdev->dev)) {
> - wrapper->ahb_clks[0].id = "m-ahb";
> - wrapper->ahb_clks[1].id = "s-ahb";
> - ret = devm_clk_bulk_get(dev, NUM_AHB_CLKS, wrapper->ahb_clks);
> + const struct geni_se_desc *desc;
> + int i;
> +
> + desc = device_get_match_data(&pdev->dev);
> + if (!desc)
> + return -EINVAL;
> +
> + wrapper->num_clks = min_t(unsigned int, desc->num_clks, MAX_CLKS);
> + if (wrapper->num_clks < desc->num_clks)
This will never execute (except if somebody adding a third desc would
make a mistake or not update MAX_CLKS), as wrapper->num_clks will only
be < desc->num_clks if desc->num_clks > MAX_CLKS.
I was thinking about getting the number of actual clocks passed to the
device in the DT, but I can't find a helper function for that, so it
would probably require some kind of manual looping.. I guess we can drop
this. Or leave it to save somebody pulling their hair out in an unlikely
event. I guess I'm fine with both.
> + dev_warn(dev, "too much clocks described in DT\n")
If you leave it, s/too much/Too many/
Konrad
> +
> + for (i = 0; i < wrapper->num_clks; ++i)
> + wrapper->clks[i].id = desc->clks[i];
> +
> + ret = devm_clk_bulk_get(dev, wrapper->num_clks, wrapper->clks);
> if (ret) {
> - dev_err(dev, "Err getting AHB clks %d\n", ret);
> + dev_err(dev, "Err getting clks %d\n", ret);
> return ret;
> }
> }
> @@ -901,8 +922,18 @@ static int geni_se_probe(struct platform_device *pdev)
> return devm_of_platform_populate(dev);
> }
>
> +static const char * const qup_clks[] = {
> + "m-ahb",
> + "s-ahb",
> +};
> +
> +static const struct geni_se_desc qup_desc = {
> + .clks = qup_clks,
> + .num_clks = ARRAY_SIZE(qup_clks),
> +};
> +
> static const struct of_device_id geni_se_dt_match[] = {
> - { .compatible = "qcom,geni-se-qup", },
> + { .compatible = "qcom,geni-se-qup", .data = &qup_desc },
> {}
> };
> MODULE_DEVICE_TABLE(of, geni_se_dt_match);
>
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