linux-kernel - Re: [PATCH 03/18] clk: meson: migrate a1 clock drivers out of hw_onecell_data to drop NR

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Message-ID: <638206ba-e2da-bb8e-a2e4-138af84648b4@linaro.org>
Date:   Thu, 8 Jun 2023 14:53:50 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 03/18] clk: meson: migrate a1 clock drivers out of
 hw_onecell_data to drop NR_CLKS

On 08/06/2023 14:45, Jerome Brunet wrote:
>>   
>> +struct meson_a1_pll_clks {
>> +	struct clk_hw **hw_clks;
>> +	unsigned int hw_clk_num;
>> +};
>> +
>> +static struct meson_a1_pll_clks a1_pll_clks = {
>> +	.hw_clks = a1_pll_hw_clks,
>> +	.hw_clk_num = ARRAY_SIZE(a1_pll_hw_clks),
>> +};
>> +
>> +static struct clk_hw *meson_a1_pll_hw_get(struct of_phandle_args *clkspec, void *clk_data)
>> +{
>> +	const struct meson_a1_pll_clks *data = clk_data;
>> +	unsigned int idx = clkspec->args[0];
>> +
>> +	if (idx >= data->hw_clk_num) {
>> +		pr_err("%s: invalid index %u\n", __func__, idx);
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +
>> +	return data->hw_clks[idx];
>> +}
> 
> I'd prefer to have a single struct type and and single custom
> callback for the different SoC please.

Sure, I've written a common code for that, but I have a hard time finding
a proper naming for it... so I choosed meson-clkc since it could have
more common helper code for duplicated code over the clk driver:

===================================><============================================================================
diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
index 8ce846fdbe43..9070dcfd9e71 100644
--- a/drivers/clk/meson/Kconfig
+++ b/drivers/clk/meson/Kconfig
@@ -30,6 +30,9 @@ config COMMON_CLK_MESON_VID_PLL_DIV
  	tristate
  	select COMMON_CLK_MESON_REGMAP

+config COMMON_CLK_MESON_CLKC
+	tristate
+
  config COMMON_CLK_MESON_AO_CLKC
  	tristate
  	select COMMON_CLK_MESON_REGMAP
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index d5288662881d..13c6db466986 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -1,6 +1,7 @@
  # SPDX-License-Identifier: GPL-2.0-only
  # Amlogic clock drivers

+obj-$(CONFIG_COMMON_CLK_MESON_CLKC) += meson-clkc.o
  obj-$(CONFIG_COMMON_CLK_MESON_AO_CLKC) += meson-aoclk.o
  obj-$(CONFIG_COMMON_CLK_MESON_CPU_DYNDIV) += clk-cpu-dyndiv.o
  obj-$(CONFIG_COMMON_CLK_MESON_DUALDIV) += clk-dualdiv.o
diff --git a/drivers/clk/meson/meson-clkc.c b/drivers/clk/meson/meson-clkc.c
new file mode 100644
index 000000000000..fa98b9d09011
--- /dev/null
+++ b/drivers/clk/meson/meson-clkc.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2023 Neil Armstrong <neil.armstrong@...aro.org>
+ */
+
+#include <linux/of_device.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include "meson-clkc.h"
+
+struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data)
+{
+	const struct meson_clk_hw_data *data = clk_hw_data;
+	unsigned int idx = clkspec->args[0];
+
+	if (idx >= data->num) {
+		pr_err("%s: invalid index %u\n", __func__, idx);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return data->hws[idx];
+}
+EXPORT_SYMBOL_GPL(meson_clk_hw_get);
+
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/clk/meson/meson-clkc.h b/drivers/clk/meson/meson-clkc.h
new file mode 100644
index 000000000000..e3bad2aa17eb
--- /dev/null
+++ b/drivers/clk/meson/meson-clkc.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright (c) 2023 Neil Armstrong <neil.armstrong@...aro.org>
+ */
+
+#ifndef __MESON_HW_CLKC_H__
+#define __MESON_HW_CLKC_H__
+
+#include <linux/of_device.h>
+#include <linux/clk-provider.h>
+
+struct meson_clk_hw_data {
+	struct clk_hw	**hws;
+	unsigned int	num;
+};
+
+struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data);
+
+#endif
===================================><============================================================================

If it's ok I'll send a v2 using this.

Thanks,
Neil