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From 8dc61364164e79e44c07fa2ac0a7b6939f00d5db Mon Sep 17 00:00:00 2001
From: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Date: Sun, 11 Jun 2023 15:03:13 +0100
Subject: [PATCH] nvmem: rockchip-otp: Add clks and reg_read to rockchip_data

In preparation to support new Rockchip OTP memory devices with different
clock configurations and register layout, extend rockchip_data struct
with the related members: clks, num_clks, reg_read.

Additionally, to avoid managing redundant driver data, drop num_clks
member from rockchip_otp struct and update all references to point to
the equivalent member in rockchip_data.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Tested-by: Vincent Legoll <vincent.legoll@gmail.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Message-ID: <20230611140330.154222-10-srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/nvmem/rockchip-otp.c | 79 ++++++++++++++++++++++--------------
 1 file changed, 49 insertions(+), 30 deletions(-)

--- a/drivers/nvmem/rockchip-otp.c
+++ b/drivers/nvmem/rockchip-otp.c
@@ -54,21 +54,19 @@
 
 #define OTPC_TIMEOUT                   10000
 
+struct rockchip_data {
+       int size;
+       const char * const *clks;
+       int num_clks;
+       nvmem_reg_read_t reg_read;
+};
+
 struct rockchip_otp {
        struct device *dev;
        void __iomem *base;
-       struct clk_bulk_data    *clks;
-       int num_clks;
+       struct clk_bulk_data *clks;
        struct reset_control *rst;
-};
-
-/* list of required clocks */
-static const char * const rockchip_otp_clocks[] = {
-       "otp", "apb_pclk", "phy",
-};
-
-struct rockchip_data {
-       int size;
+       const struct rockchip_data *data;
 };
 
 static int rockchip_otp_reset(struct rockchip_otp *otp)
@@ -132,29 +130,23 @@ static int rockchip_otp_ecc_enable(struc
        return ret;
 }
 
-static int rockchip_otp_read(void *context, unsigned int offset,
-                            void *val, size_t bytes)
+static int px30_otp_read(void *context, unsigned int offset,
+                        void *val, size_t bytes)
 {
        struct rockchip_otp *otp = context;
        u8 *buf = val;
-       int ret = 0;
-
-       ret = clk_bulk_prepare_enable(otp->num_clks, otp->clks);
-       if (ret < 0) {
-               dev_err(otp->dev, "failed to prepare/enable clks\n");
-               return ret;
-       }
+       int ret;
 
        ret = rockchip_otp_reset(otp);
        if (ret) {
                dev_err(otp->dev, "failed to reset otp phy\n");
-               goto disable_clks;
+               return ret;
        }
 
        ret = rockchip_otp_ecc_enable(otp, false);
        if (ret < 0) {
                dev_err(otp->dev, "rockchip_otp_ecc_enable err\n");
-               goto disable_clks;
+               return ret;
        }
 
        writel(OTPC_USE_USER | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL);
@@ -174,8 +166,28 @@ static int rockchip_otp_read(void *conte
 
 read_end:
        writel(0x0 | OTPC_USE_USER_MASK, otp->base + OTPC_USER_CTRL);
-disable_clks:
-       clk_bulk_disable_unprepare(otp->num_clks, otp->clks);
+
+       return ret;
+}
+
+static int rockchip_otp_read(void *context, unsigned int offset,
+                            void *val, size_t bytes)
+{
+       struct rockchip_otp *otp = context;
+       int ret;
+
+       if (!otp->data || !otp->data->reg_read)
+               return -EINVAL;
+
+       ret = clk_bulk_prepare_enable(otp->data->num_clks, otp->clks);
+       if (ret < 0) {
+               dev_err(otp->dev, "failed to prepare/enable clks\n");
+               return ret;
+       }
+
+       ret = otp->data->reg_read(context, offset, val, bytes);
+
+       clk_bulk_disable_unprepare(otp->data->num_clks, otp->clks);
 
        return ret;
 }
@@ -189,8 +201,15 @@ static struct nvmem_config otp_config =
        .reg_read = rockchip_otp_read,
 };
 
+static const char * const px30_otp_clocks[] = {
+       "otp", "apb_pclk", "phy",
+};
+
 static const struct rockchip_data px30_data = {
        .size = 0x40,
+       .clks = px30_otp_clocks,
+       .num_clks = ARRAY_SIZE(px30_otp_clocks),
+       .reg_read = px30_otp_read,
 };
 
 static const struct of_device_id rockchip_otp_match[] = {
@@ -225,21 +244,21 @@ static int rockchip_otp_probe(struct pla
        if (!otp)
                return -ENOMEM;
 
+       otp->data = data;
        otp->dev = dev;
        otp->base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(otp->base))
                return PTR_ERR(otp->base);
 
-       otp->num_clks = ARRAY_SIZE(rockchip_otp_clocks);
-       otp->clks = devm_kcalloc(dev, otp->num_clks,
-                                    sizeof(*otp->clks), GFP_KERNEL);
+       otp->clks = devm_kcalloc(dev, data->num_clks, sizeof(*otp->clks),
+                                GFP_KERNEL);
        if (!otp->clks)
                return -ENOMEM;
 
-       for (i = 0; i < otp->num_clks; ++i)
-               otp->clks[i].id = rockchip_otp_clocks[i];
+       for (i = 0; i < data->num_clks; ++i)
+               otp->clks[i].id = data->clks[i];
 
-       ret = devm_clk_bulk_get(dev, otp->num_clks, otp->clks);
+       ret = devm_clk_bulk_get(dev, data->num_clks, otp->clks);
        if (ret)
                return ret;